参数资料
型号: 1215E
英文描述: TEST/JTAG SUPPORT|CMOS|QFP|48PIN|PLASTIC
中文描述: 测试/ JTAG支持|的CMOS | QFP封装| 48PIN |塑料
文件页数: 48/92页
文件大小: 1041K
代理商: 1215E
52
Agere Systems Inc.
User Manual
April 2001
Advanced Operational Mode
497AE and 1215E Boundary-Scan Master 2
Appendix B—BSM2 Register Descriptions (continued)
API: TVI Address Pointer Register
Purpose
Provides a pointer to currently addressed word of the TVI Test Data Memory (FIFO) (buffer). The currently
addressed word during a scan operation is the word currently being written with test data from the output of the
selected/attached B-S chain. Autoincrementing of this pointer is turned on and off by the use of the AINC[1] bit.
Address (Octal)
06
Format
Default (Hex)
API = 0000
Read-only Bits
None
Description
API[8:0]
(TVI Address Pointer)—In normal scan operation, this register field contains the address [0—777
(octal), 0—511 (decimal)] of the word of the TVI data memory currently being written from the output
of the currently selected/attached B-S chain. The only instance in which a controlling processor would
write to this register during normal scan operation would be to reset it to 0 if that were necessary
because TVI operates as a FIFO in normal scan operation—no addressing action by the controlling
processor is necessary.
In ATPG mode, the TVI data memory is combined with the TVO data memory to create an intercon-
nect map of the circuit sensed and driven by the selected/attached B-S chain [(see under the heading
Scan-Sequence Modifier (SSM)]. The interconnect map is written by the controlling processor prior to
starting ATPG. The TVI address pointer (API) is then used to address the words of TVI to be written
with the necessary information. (See also, description of the TVIR register and the AINC[1] bit.) After
writing data to the TVI data memory for these ATPG modes, the TVI address pointer register must be
reset to its initial value.
15—09
08—00
unused
API[8:0]
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