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參數(shù)資料
| 型號： | SN54ABT8952JT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SCAN TEST DEVICES WITH OCTAL REGISTERED BUS TRANSCEIVERS |
| 中文描述： | 掃描測試設(shè)備與八進(jìn)制注冊總線收發(fā)器 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 365K |
| 代理商： | SN54ABT8952JT |
SN54ABT8952, SN74ABT8952
SCAN TEST DEVICES WITH
OCTAL REGISTERED BUS TRANSCEIVERS
SCBS121D – AUGUST 1992 – REVISED JULY 1996
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
simultaneous PSA and binary count up (PSA/COUNT)
Data appearing at the selected device input pins is compressed into an 8-bit parallel signature in the
shift-register elements of the selected input BSCs on each rising edge of TCK. This data is updated in the
shadow latches of the selected input BSCs and applied to the inputs of the normal on-chip logic. At the same
time, an 8-bit binary count-up pattern is generated in the shift-register elements of the selected output BSCs
on each rising edge of TCK, updated in the shadow latches, and applied to the associated device output pins
on each falling edge of TCK. In addition, the shift-register elements of the opposite output BSCs count carries
out of the selected output BSCs extending the count to 16 bits. Figures 10 and 11 illustrate the 8-bit
linear-feedback shift-register algorithms through which the signature is generated. An initial seed value should
be scanned into the BSR before performing this operation.
=
=
M
A8-I
B8-O
A7-I
A6-I
A5-I
A4-I
A3-I
A2-I
A1-I
B7-O
B6-O
B5-O
B4-O
B3-O
B2-O
B1-O
MSB
LSB
Figure 10. 8-Bit PSA/COUNT Configuration (OEAB = 0, OEBA = 1)
=
=
M
B8-I
A8-O
B7-I
B6-I
B5-I
B4-I
B3-I
B2-I
B1-I
A7-O
A6-O
A5-O
A4-O
A3-O
A2-O
A1-O
MSB
LSB
Figure 11. 8-Bit PSA/COUNT Configuration (OEAB = 1, OEBA = 0)
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