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SN74ABT8952DWRE4 датащи(PDF) 9 Page - Texas Instruments

номер детали SN74ABT8952DWRE4
подробное описание детали  SCAN TEST DEVICES WITH OCTAL REGISTERED BUS TRANSCEIVERS
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производитель  TI [Texas Instruments]
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SN54ABT8952, SN74ABT8952
SCAN TEST DEVICES WITH
OCTAL REGISTERED BUS TRANSCEIVERS
SCBS121D – AUGUST 1992 – REVISED JULY 1996
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
data register description
boundary-scan register
The boundary-scan register (BSR) is 38 bits long. It contains one boundary-scan cell (BSC) for each
normal-function input pin and two BSCs for each normal-function I/O pin (one for input data and one for output
data). The BSR is used 1) to store test data that is to be applied internally to the inputs of the normal on-chip
logic and/or externally to the device output pins, and/or 2) to capture data that appears internally at the outputs
of the normal on-chip logic and/or externally at the device input pins.
The source of data to be captured into the BSR during Capture-DR is determined by the current instruction. The
contents of the BSR can change during Run-Test/Idle as determined by the current instruction. At power up or
in Test-Logic-Reset, the value of each BSC is reset to logic 0 except BSCs 37–36, which are reset to logic 1.
The BSR order of scan is from TDI through bits 37–0 to TDO. Table 1 shows the BSR bits and their associated
device pin signals.
Table 1. Boundary-Scan Register Configuration
BSR BIT
NUMBER
DEVICE
SIGNAL
BSR BIT
NUMBER
DEVICE
SIGNAL
BSR BIT
NUMBER
DEVICE
SIGNAL
BSR BIT
NUMBER
DEVICE
SIGNAL
BSR BIT
NUMBER
DEVICE
SIGNAL
37
OEAB
31
A8-I
23
A8-O
15
B8-I
7
B8-O
36
OEBA
30
A7-I
22
A7-O
14
B7-I
6
B7-O
35
CLKAB
29
A6-I
21
A6-O
13
B6-I
5
B6-O
34
CLKBA
28
A5-I
20
A5-O
12
B5-I
4
B5-O
33
CLKENAB
27
A4-I
19
A4-O
11
B4-I
3
B4-O
32
CLKENBA
26
A3-I
18
A3-O
10
B3-I
2
B3-O
––
––
25
A2-I
17
A2-O
9
B2-I
1
B2-O
––
––
24
A1-I
16
A1-O
8
B1-I
0
B1-O


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