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CN8472AEPF 参数 Datasheet PDF下载

CN8472AEPF图片预览
型号: CN8472AEPF
PDF下载: 下载PDF文件 查看货源
内容描述: 多通道同步通信控制器( MUSYCC ™ ) [Multichannel Synchronous Communications Controller (MUSYCC?)]
分类和应用: 通信控制器
文件页数/大小: 221 页 / 2104 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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A
Appendix A JTAG Interface  
The CN8478 supports boundary scan testing conforming to IEEE standard  
1149.1a-1993 and supplement 1149.1b. 1994. This appendix is intended to assist  
the customer in developing boundary scan tests for printed circuit boards and  
systems that use the CN8478. It is assumed that the reader is familiar with  
boundary scan terminology. For the latest version of the Boundary Scan  
Description Language (BSDL) file, contact Technical Publications.  
The JTAG Interface section of the CN8478 provides access to all external I/O  
signals of the device for board and system level testing. This circuitry also  
conforms to IEEE std 1149.1a-1993.  
A.1 Instruction Register  
The Instruction register (IR) is a 3-bit register. When the boundary scan circuitry  
is reset, the IR is loaded with the BYPASS Instruction. The Capture-IR binary  
value is 001.  
The eight instructions include three IEEE 1149.1 mandatory public  
instructions (BYPASS, EXTEST, and SAMPLE/PRELOAD) and five private  
instructions for manufacturing use only. Bit 0 (LSB) is shifted into instruction  
register first.  
Table A-1. IEEE Std. 1149.1 Instructions  
Bit 2  
Bit 1  
Bit 0  
Instruction  
Register Accessed  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
EXTEST  
SAMPLE/PRELOAD  
Private  
Boundary Scan  
Boundary Scan  
Private  
Private  
Private  
Private  
BYPASS  
Bypass  
100660E  
Conexant  
A-1