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: 22/92页
文件大小: 1041K
代理商: 1215E
Agere Systems Inc.
29
User Manual
April 2001
Advanced Operational Mode
497AE and 1215E Boundary-Scan Master 2
Appendix A—BSM2 Pseudocode Examples (continued)
Setting up and Running an ATPG Algorithm
The following pseudocode illustrates the selection of an ATPG algorithm, the writing of seeds values to the pseudo-
random pattern generating register (PRPG) and to the signature analysis register (SAR), and the initiation of the
The pseudocode is for the test of a board with seven nets and applies a walking-ones test. Each net’s inputs and
outputs are described with i’s and o’s. The board contains two devices. Each has an instruction register length of
eight bits and a boundary-scan register length of 18 bits. A description of translation of circuit net list to BSM2
ATPG control information is beyond the scope of this manual.
Other relevant data for the chip follows. A control cell that must be maintained in the logic 1 state is indicated by an
h.
Sample Opcode:
00000010 - 00000010
Extest Opcode:
11111111 - 11111111
Safe Value:
hh xxxx xxxx xxxx xxxx - hh xxxx xxxx xxxx xxxx
Net 1:
xx xxxx xxxo xxxi xxxx - xx xxxx xxxx xxxx xxxx
Net 2:
xx xxxx xxox xxix xxxx - xx xxxx xxxx xxxx xxxx
Net 3:
xx xxxx xoxx xixx xxxx - xx xxxx xxxx xxxx xxxx
Net 4:
xx xxxx oxxx ixxx xxxx - xx xxxx xxxx xxxx xxxx
Net 5:
xx xxxx xxxx xxxx xxxx - xh xxxo xxxo xxix xxxx
Net 6:
xx xxxx xxxx xxxx xxxx - xh xxox xxox xixx xxxx
Net 7:
xx xxxx xxxx xxxx xxxx - xh xoxx xoxx ixxx xxxx
Scan Sample Opcodes into instruction registers
Scan Safe Values into data registers
Scan Extest Opcodes into instruction registers
Preload TVO/TVI memory with code describing nets
/*these codes can be automatically generated
from the above net descriptions*/
*----------------------------------------*
/*Select location in TVO memory*/
Write <address> to APO
*----------------------------------------*
/*Write coded data to TVO memory*/
Write 0x00E0 to TVOR
Write 0x03C1 to TVOR
Write 0x0000 to TVOR
/*Only low order 4 bits are significant*/
*----------------------------------------*
/*Select same location in TVI memory*/
Write <address> to API
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