阅读说明：本技术 存储器的测试方法、存储介质和计算机设备 (Memory test method, storage medium and computer device ) 是由 龙光腾 何浩 陆丹 胡波 于 2020-03-27 设计创作，主要内容包括：本公开提供了一种存储器的测试方法、存储介质和计算机设备。存储器的测试方法包括：获取需要写入多个芯片接口的目标测试式样,多个所述芯片接口与多个物理通信接口一一对应连接；确定与各所述物理通信接口的第一信息分别对应的所述芯片接口的第二信息,并将所述第一信息和所述第二信息作为对应连接信息；对所述对应连接信息进行重映射得到映射连接信息；根据所述目标测试式样与所述映射连接信息确定需要写入所述物理通信接口的初始测试式样。本公开能够提高测试的准确性。(The present disclosure provides a test method of a memory, a storage medium, and a computer device. The testing method of the memory comprises the following steps: acquiring a target test pattern needing to be written into a plurality of chip interfaces, wherein the plurality of chip interfaces are connected with a plurality of physical communication interfaces in a one-to-one correspondence manner; determining second information of the chip interface corresponding to the first information of each physical communication interface respectively, and taking the first information and the second information as corresponding connection information; remapping the corresponding connection information to obtain mapping connection information; and determining an initial test pattern needing to be written into the physical communication interface according to the target test pattern and the mapping connection information. The present disclosure can improve the accuracy of the test.)

1. A method for testing a memory, the method comprising:

acquiring a target test pattern needing to be written into a plurality of chip interfaces, wherein the plurality of chip interfaces are connected with a plurality of physical communication interfaces in a one-to-one correspondence manner;

determining second information of the chip interface corresponding to the first information of each physical communication interface respectively, and taking the first information and the second information as corresponding connection information;

remapping the corresponding connection information to obtain mapping connection information;

and determining an initial test pattern needing to be written into the physical communication interface according to the target test pattern and the mapping connection information.

2. The method for testing the memory according to claim 1, wherein the determining the second information of the chip interface corresponding to the first information of each physical communication interface comprises:

continuously numbering a plurality of chip interfaces, wherein the numbers of the chip interfaces are integers;

continuously numbering a plurality of the physical communication interfaces, wherein the numbers of the physical communication interfaces are integers;

and determining the number of the chip interface connected with the physical communication interface with the number of the first character, wherein the number of the chip interface is a second character, so as to obtain the corresponding relation between the first character and the second character, and using the corresponding relation as the corresponding connection information.

3. The method for testing the memory according to claim 2, wherein the determining the number of the chip interface connected to the physical communication interface numbered with the first character, the number of the chip interface numbered with the second character comprises:

writing a first reference pattern to a plurality of said physical communication interfaces, said first reference pattern pointing to said physical communication interfaces numbered with a first character;

acquiring second reference patterns output by a plurality of chip interfaces, wherein the second reference patterns are obtained by transmitting the first reference patterns;

and determining the number of the chip interface pointed by the second reference pattern, wherein the number of the chip interface is a second character.

4. The method for testing a memory according to claim 2, wherein the remapping the corresponding connection information to obtain mapping connection information comprises:

rearranging the first characters mapped by the second characters as third characters according to the sequence of the continuous numbers of the plurality of chip interfaces on the basis of the corresponding connection information to generate third information;

and using the first information and the third information as mapping connection information.

5. The method for testing the memory of claim 4, wherein the initial number of the chip interface is equal to the initial number of the physical communication interface, and determining the initial test pattern to be written into the physical communication interface according to the target test pattern and the mapping connection information comprises:

representing the target test pattern in binary, and performing left shift operation on the target number in the target test pattern corresponding to the physical communication interface which is numbered as a first character to obtain an intermediate number, wherein the number of left shift is equal to a value obtained by subtracting the initial number from a third character corresponding to the first character in the mapping connection information;

and adding the intermediate numbers to obtain an initial test pattern needing to be written into the physical communication interface.

6. The method for testing the memory according to claim 2, wherein the sequentially numbering the plurality of chip interfaces comprises:

numbering a plurality of the chip interfaces from 0 in succession;

said successively numbering a plurality of said physical communication interfaces comprises:

a plurality of the physical communication interfaces are numbered consecutively starting from 0.

7. The method for testing a memory of claim 1, wherein the target test pattern and the initial test pattern are both non-binary, and determining the initial test pattern to be written to the physical communication interface according to the target test pattern and the mapping connection information comprises:

representing the target test pattern in binary;

determining an initial test pattern in binary representation required to be written into the physical communication interface according to the target test pattern in binary representation and the mapping connection information.

8. The method for testing a memory of claim 7, wherein the target test pattern and the initial test pattern are hexadecimal numbers.

9. The method for testing a memory according to claim 8, wherein after determining an initial test pattern in binary representation to be written to the physical communication interface based on the target test pattern in binary representation and the corresponding connection information, the method further comprises:

converting the initial test pattern in binary representation into the initial test pattern in hexadecimal representation.

10. The method for testing a memory according to claim 1, wherein the memory is a double-rate synchronous dynamic random access memory.

11. The method of claim 1, wherein the target test pattern and the initial test pattern are data patterns.

12. The method of claim 1, wherein the target test pattern and the initial test pattern are both address patterns.

13. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 12.

14. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1-12 are implemented when the program is executed by the processor.

Technical Field

The present disclosure relates to the field of semiconductor technologies, and in particular, to a method for testing a memory, a storage medium, and a computer device.

Background

With the rapid development of integrated circuit technology, memory has attracted more and more attention.

The memory generally includes a plurality of chip interfaces, the memory controller is connected to the memory through a plurality of Physical communication interfaces (PHYs), and the plurality of Physical communication interfaces are connected to the plurality of chip interfaces of the memory in a one-to-one correspondence. In the process of testing the memory, the test pattern written into the chip interface needs to be accurately controlled by the memory controller. However, after the operator writes the required pattern into the physical communication interface, the data line between the physical communication interface and the chip interface is rearranged (swizzle) due to the wire length, etc., so that the required test pattern cannot be written into the chip interface, which increases the difficulty of testing.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide a test method of a memory, a storage medium and computer equipment, which can reduce the test difficulty.

According to an aspect of the present disclosure, there is provided a method of testing a memory, the method comprising:

acquiring a target test pattern needing to be written into a plurality of chip interfaces, wherein the plurality of chip interfaces are connected with a plurality of physical communication interfaces in a one-to-one correspondence manner;

determining second information of the chip interface corresponding to the first information of each physical communication interface respectively, and taking the first information and the second information as corresponding connection information;

remapping the corresponding connection information to obtain mapping connection information;

and determining an initial test pattern needing to be written into the physical communication interface according to the target test pattern and the mapping connection information.

In an exemplary embodiment of the disclosure, the determining second information of the chip interfaces corresponding to the first information of the physical communication interfaces respectively includes:

continuously numbering a plurality of chip interfaces, wherein the numbers of the chip interfaces are integers;

continuously numbering a plurality of the physical communication interfaces, wherein the numbers of the physical communication interfaces are integers;

and determining the number of the chip interface connected with the physical communication interface with the number of the first character, wherein the number of the chip interface is a second character, so as to obtain the corresponding relation between the first character and the second character, and using the corresponding relation as the corresponding connection information.

In an exemplary embodiment of the present disclosure, the determining the number of the chip interface connected to the physical communication interface numbered as a first character, the number of the chip interface numbered as a second character, includes:

writing a first reference pattern to a plurality of said physical communication interfaces, said first reference pattern pointing to said physical communication interfaces numbered with a first character;

acquiring second reference patterns output by a plurality of chip interfaces, wherein the second reference patterns are obtained by transmitting the first reference patterns;

and determining the number of the chip interface pointed by the second reference pattern, wherein the number of the chip interface is a second character.

In an exemplary embodiment of the present disclosure, the remapping the corresponding connection information to obtain mapping connection information includes:

rearranging the first characters mapped by the second characters as third characters according to the sequence of the continuous numbers of the plurality of chip interfaces on the basis of the corresponding connection information to generate third information;

and using the first information and the third information as mapping connection information.

In an exemplary embodiment of the present disclosure, the initial number of the chip interface is equal to the initial number of the physical communication interface, and determining the initial test pattern to be written into the physical communication interface according to the target test pattern and the mapping connection information includes:

representing the target test pattern in binary, and performing left shift operation on the target number in the target test pattern corresponding to the physical communication interface which is numbered as a first character to obtain an intermediate number, wherein the number of left shift is equal to a value obtained by subtracting the initial number from a third character corresponding to the first character in the mapping connection information;

and adding the intermediate numbers to obtain an initial test pattern needing to be written into the physical communication interface.

In an exemplary embodiment of the present disclosure, said successively numbering a plurality of said chip interfaces comprises:

numbering a plurality of the chip interfaces from 0 in succession;

said successively numbering a plurality of said physical communication interfaces comprises:

a plurality of the physical communication interfaces are numbered consecutively starting from 0.

In an exemplary embodiment of the present disclosure, the determining the initial test pattern to be written to the physical communication interface according to the target test pattern and the mapping connection information includes:

representing the target test pattern in binary;

determining an initial test pattern in binary representation required to be written into the physical communication interface according to the target test pattern in binary representation and the mapping connection information.

In an exemplary embodiment of the present disclosure, the target test pattern and the initial test pattern are each hexadecimal numbers.

In an exemplary embodiment of the present disclosure, after determining an initial test pattern in binary representation required to be written to the physical communication interface according to the target test pattern in binary representation and the corresponding connection information, the test method of the memory further includes:

converting the initial test pattern in binary representation into the initial test pattern in hexadecimal representation.

In an exemplary embodiment of the present disclosure, the memory is a double rate synchronous dynamic random access memory.

In an exemplary embodiment of the present disclosure, the target test pattern and the initial test pattern are both data patterns.

In an exemplary embodiment of the present disclosure, the target test pattern and the initial test pattern are both address patterns.

According to an aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the methods described above.

According to an aspect of the present disclosure, there is provided a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any one of the methods described above when executing the program.

The memory test method, the memory medium and the computer device determine an initial test pattern to be written into a physical communication interface according to a target test pattern and mapping connection information. Since the mapping connection information is obtained by remapping the corresponding connection information, and the corresponding connection information is obtained by determining the second information of the chip interface corresponding to the first information of each physical communication interface, after the determined initial test pattern is written into the physical communication interface, the target side test pattern required by the test can be written into the chip interface, thereby reducing the difficulty of the test.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

FIG. 1 is a block diagram of a testing method of an embodiment of the present disclosure;

FIG. 2 is a flow chart of a testing method of an embodiment of the present disclosure;

FIG. 3 is a flowchart of step S110 in the testing method according to the embodiment of the disclosure;

fig. 4 is a flowchart of step S120 in the testing method according to the embodiment of the disclosure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising," "having," and "providing" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

The embodiment of the disclosure provides a test method of a memory. The memory includes a plurality of chip interfaces. The chip interface may be a data interface of the memory, but is not limited thereto, and the chip interface may also be an address interface of the memory. The Memory is a Double Data Rate Synchronous Dynamic Random Access (DDR SDRAM), but the embodiments of the present disclosure are not limited thereto. As shown in fig. 1, the memory controller 10 is connected to the memory 30 through a physical communication interface (PHY)20, and a plurality of physical communication interfaces 20 and a plurality of chip interfaces of the memory 30 are connected in one-to-one correspondence through command address signal lines 40 and data signal lines 50. The memory controller 10 may send address patterns to the memory 30 via the command address signal lines 40, but may send data patterns to the memory 30 via the data signal lines 50.

As shown in fig. 2, the method for testing a memory may include steps S100 to S130, wherein:

step S100, obtaining a target test pattern needing to be written into a plurality of chip interfaces, wherein the plurality of chip interfaces are connected with the plurality of physical communication interfaces in a one-to-one correspondence mode.

Step S110, determining second information of the chip interfaces corresponding to the first information of each physical communication interface, and using the first information and the second information as corresponding connection information.

And step S120, remapping the corresponding connection information to obtain mapping connection information.

Step S130, determining an initial test pattern needing to be written into the physical communication interface according to the target test pattern and the mapping connection information.

According to the testing method of the memory, the initial testing pattern needing to be written into the physical communication interface is determined according to the target testing pattern and the mapping connection information. Since the mapping connection information is obtained by remapping the corresponding connection information, and the corresponding connection information is obtained by determining the second information of the chip interface corresponding to the first information of each physical communication interface, after the determined initial test pattern is written into the physical communication interface, the target side test pattern required by the test can be written into the chip interface, thereby reducing the difficulty of the test.

The following describes in detail the steps of the method for testing a memory according to the embodiment of the present disclosure:

in step S100, a target test pattern to be written into a plurality of chip interfaces is obtained, and the plurality of chip interfaces and the plurality of physical communication interfaces are connected in a one-to-one correspondence.

The target test pattern (pattern) may be a data pattern, i.e. the chip interface is a data interface of the memory. Of course, the target test pattern may also be an address pattern, that is, the chip interface is an address interface of the memory. In an embodiment of the present disclosure, the target test pattern is non-binary, for example, a hexadecimal number, but embodiments of the present disclosure are not limited thereto. In other embodiments of the present disclosure, the target test pattern is a binary number.

In step S110, second information of the chip interface corresponding to the first information of each physical communication interface is determined, and the first information and the second information are used as corresponding connection information.

The present disclosure may number each physical communication interface in advance, for example, the physical communication interfaces may be numbered by letters A, B, C, D, etc., but is not limited thereto, and the physical communication interfaces may be numbered by numbers 1, 2, 3, etc. The first information of the physical communication interface may be number information of the physical communication interface, but the embodiment of the present disclosure is not limited to this specifically. The chip interfaces may be numbered in advance in the present disclosure, for example, by a letter A, B, C, D, but the present disclosure is not limited thereto, and may also be numbered by numbers 1, 2, 3, and the like. The second information of the chip interface may be number information of the chip interface, but the embodiment of the present disclosure is not limited to this.

Taking numbering of chip interfaces and physical communication interfaces by numbers as an example, as shown in fig. 3, step S110 may include steps S1100 to S1102, where:

step S1100, a plurality of chip interfaces are numbered continuously, and the numbers of the chip interfaces are integers.

Wherein, step S1100 may include: the plurality of chip interfaces are numbered consecutively from a. In this embodiment, a may be a negative integer, and of course, may also be 0, but the present disclosure is not limited thereto, and may also be a positive integer. The chip interfaces are numbered sequentially from a, namely, the chip interfaces are numbered according to an arithmetic progression of (a, a +1, a +2, a +3, a +4, a +5, a +6 … … a + x, wherein x is more than or equal to 1). Taking the number of the chip interfaces as 16 and a equal to 0 as an example, the chip interfaces are numbered sequentially from 0, that is, the chip interfaces are numbered according to an arithmetic progression of (0, 1, 2, 3, 4, 5, 6 … … 13, 14, 15), wherein the initial number of the chip interface is 0 and the final number of the chip interface is 15.

Step S1101 is to number the plurality of physical communication interfaces consecutively, and the numbers of the physical communication interfaces are integers.

Wherein, step S1101 may include: the plurality of physical communication interfaces are numbered consecutively from a. The plurality of physical communication interfaces may be numbered in an arithmetic progression of (a, a +1, a +2, a +3, a +4, a +5, a +6 … … a + x, x being equal to or greater than 1). Taking the number of the physical communication interfaces as 16 and a equal to 0 as an example, the plurality of physical communication interfaces are numbered sequentially from 0, that is, the plurality of physical communication interfaces are numbered in an arithmetic progression of (0, 1, 2, 3, 4, 5, 6 … … 13, 14, 15), wherein the initial number of the physical communication interface is 0 and the final number of the physical communication interface is 15. In addition, the initial number of the chip interface and the initial number of the physical communication interface may be equal, and of course, may not be equal.

Step S1102, determining a serial number of a chip interface connected to the physical communication interface numbered as the first character, where the serial number of the chip interface is the second character, so as to obtain a corresponding relationship between the first character and the second character, and using the corresponding relationship as corresponding connection information.

Wherein, step S1102 may include: writing a first reference pattern to the plurality of physical communication interfaces, the first reference pattern pointing to the physical communication interface numbered as a first character; acquiring second reference patterns output by a plurality of chip interfaces, wherein the second reference patterns are obtained by transmitting the first reference patterns; and determining the number of the chip interface pointed by the second reference pattern, wherein the number of the chip interface is a second character.

Taking the plurality of chip interfaces as numbered by the arithmetic progression of (0, 1, 2, 3, 4, 5, 6 … … 13, 14, 15) and the plurality of physical communication interfaces as numbered by the arithmetic progression of (0, 1, 2, 3, 4, 5, 6 … … 13, 14, 15), for example, writing a first reference pattern (1000000000000000) into the plurality of physical communication interfaces for a memory, wherein "1" in the first reference pattern corresponds to the physical communication interface with the number of 0; and acquiring a second reference pattern corresponding to the chip interface, wherein the chip interface corresponding to the '1' in the second reference pattern is correspondingly connected with the physical communication interface with the number of 0, so that the number of the chip interface pointed by the second reference pattern can be determined, and the number of the chip interface is recorded as a second character. For example, if the physical communication interface numbered 0 corresponds to the chip interface numbered 4, the second reference pattern obtained at the chip interface is displayed as the chip interface numbered 4 outputting a value "1", i.e. the second character is 4. Similarly, the corresponding connection status of the other numbers can also be determined by the same method. The corresponding connection information determined in the final step S1102 is shown in table 1:

TABLE 1

In step S120, the mapping connection information is obtained by remapping the corresponding connection information.

For example, as shown in fig. 4, step 120 may include step S1200 and step S1201, where:

step S1200, rearranging the first characters mapped by the second characters as third characters according to the sequence of the serial numbers of the plurality of chip interfaces based on the corresponding connection information, so as to generate third information.

Taking the correspondence connection information as shown in table 1 as an example, it can be seen from table 1 that the second character 0 corresponds to the first character 7, the second character 1 corresponds to the first character 3, the second character 2 corresponds to the first characters 4 and … …, and the second character 15 corresponds to the first character 8. After the second characters are arranged in the order from small to large or from large to small, the third information formed by the third characters determined in step S1200 is shown in table 2:

TABLE 2

And step S1201, taking the first information and the third information as mapping connection information.

Taking the example that the corresponding connection information is shown in table 1 and the third information is shown in table 2, the mapping connection information determined in step S1201 is shown in table 3:

TABLE 3

In step S130, an initial test pattern to be written into the physical communication interface is determined according to the target test pattern and the mapping connection information.

The initial test pattern may be a data pattern, but of course, the initial test pattern may also be an address pattern. In an embodiment of the present disclosure, the initial test pattern is a non-binary number, for example, a hexadecimal number, but embodiments of the present disclosure are not limited thereto. Taking the example that the target test pattern and the initial test pattern are both non-binary numbers, step S130 may include: representing the target test pattern in binary; an initial test pattern in binary representation to be written to the physical communication interface is determined based on the target test pattern in binary representation and the mapping connection information. Of course, after determining the initial test pattern in binary representation to be written into the physical communication interface according to the target test pattern in binary representation and the mapping connection information, step 130 may further include: the initial test pattern in binary representation is converted into an initial test pattern in hexadecimal representation.

In an embodiment of the present disclosure, taking the initial number of the chip interface and the initial number of the physical communication interface as an example, determining the initial test pattern in binary representation that needs to be written into the physical communication interface according to the target test pattern in binary representation and the mapping connection information may include; performing left shift operation on a target number in a target test pattern corresponding to a physical communication interface with the serial number of a first character to obtain an intermediate number, wherein the number of bits of the left shift is equal to a value obtained by subtracting the initial serial number from a third character corresponding to the first character in mapping connection information; and carrying out addition operation on the intermediate numbers to obtain an initial test pattern needing to be written into the physical communication interface. Wherein, taking n as the first character, m as the third character, and the initial number a as an example, the left-shifted number is equal to (m-a).

Further, taking the target test pattern as (1010101010101010) and the mapping connection information as the content shown in table 3 as an example, the specific process of step S130 is:

shifting the target number 1 in the target test pattern corresponding to the physical communication interface with the number of 1 to the left by 3 bits, wherein the obtained intermediate number is 1000; shifting the target number 1 in the target test pattern corresponding to the physical communication interface with the number of 3 to the left by 5 bits, wherein the obtained intermediate number is 100000; shifting a target number 1 in a target test pattern corresponding to a physical communication interface with the number 5 to the left by 1 bit, wherein the obtained intermediate number is 10; shifting the target number 1 in the target test pattern corresponding to the physical communication interface with the number of 7 to the left by 6 bits, wherein the obtained intermediate number is 1000000; shifting the target number 1 in the target test pattern corresponding to the physical communication interface with the number 9 to the left by 13 bits, wherein the obtained intermediate number is 10000000000000; shifting the target number 1 in the target test pattern corresponding to the physical communication interface with the number of 11 to the left by 12 bits, wherein the obtained intermediate number is 1000000000000; shifting the target number 1 in the target test pattern corresponding to the physical communication interface with the number 13 to the left by 15 bits, wherein the obtained intermediate number is 1000000000000000; shifting the target number 1 in the target test pattern corresponding to the physical communication interface with the serial number of 15 to the left by 8 bits, wherein the obtained intermediate number is 100000000; since the target numbers in the target test patterns corresponding to the even-numbered physical communication interfaces are all 0, the target numbers in the target test patterns corresponding to the even-numbered physical communication interfaces are shifted to the left, and the obtained intermediate numbers are all 0. The obtained intermediate numbers are all binary numbers, and the initial test pattern is obtained by adding all the intermediate numbers (1011000101101010). After the determined initial test pattern (1011000101101010) is written into the physical communication interface, the target side test pattern (1010101010101010) required by the test can be written into the chip interface, thereby reducing the difficulty of the test.

The disclosed embodiments also provide a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method for testing a memory according to any of the above embodiments. The readable storage medium may include: a hard disk, Random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. Since the program on the readable storage medium can implement the steps of the method for testing the memory according to any of the above embodiments when executed, the method has the same advantages as those of the above embodiments, and thus, the description thereof is omitted.

According to an aspect of the present disclosure, a computer device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the processor implements the steps of the method for testing the memory according to any of the above embodiments, so that the method has the same beneficial effects as those of the above embodiments, and details are not repeated here.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.