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SN74ABTH18504APM Arkusz danych(PDF) 10 Page - Texas Instruments

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Numer części SN74ABTH18504APM
Szczegółowy opis  SCAN TEST DEVICES WITH 20-BIT UNIVERSAL BUS TRANSCEIVERS
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SN74ABTH18504APM Arkusz danych(HTML) 10 Page - Texas Instruments

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SN54ABTH18504A, SN54ABTH182504A, SN74ABTH18504A, SN74ABTH182504A
SCAN TEST DEVICES WITH
20-BIT UNIVERSAL BUS TRANSCEIVERS
SCBS165C – AUGUST 1993 – REVISED JULY 1996
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
data register description
boundary-scan register
The boundary-scan register (BSR) is 48 bits long. It contains one boundary-scan cell (BSC) for each
normal-function input pin and one BSC for each normal-function I/O pin (one single cell for both input data and
output data). The BSR is used 1) to store test data that is to be applied 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, BSCs 47–46 are reset to logic 1, ensuring that these cells, which control A-port and B-port
outputs, are set to benign values (i.e., if test mode were invoked, the outputs would be at high-impedance state).
Reset values of other BSCs should be considered indeterminate.
The BSR order of scan is from TDI through bits 47–0 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
47
OEAB
39
A20-I/O
19
B20-I/O
46
OEBA
38
A19-I/O
18
B19-I/O
45
CLKAB
37
A18-I/O
17
B18-I/O
44
CLKBA
36
A17-I/O
16
B17-I/O
43
CLKENAB
35
A16-I/O
15
B16-I/O
42
CLKENBA
34
A15-I/O
14
B15-I/O
41
LEAB
33
A14-I/O
13
B14-I/O
40
LEBA
32
A13-I/O
12
B13-I/O
––
––
31
A12-I/O
11
B12-I/O
––
––
30
A11-I/O
10
B11-I/O
––
––
29
A10-I/O
9
B10-I/O
––
––
28
A9-I/O
8
B9-I/O
––
––
27
A8-I/O
7
B8-I/O
––
––
26
A7-I/O
6
B7-I/O
––
––
25
A6-I/O
5
B6-I/O
––
––
24
A5-I/O
4
B5-I/O
––
––
23
A4-I/O
3
B4-I/O
––
––
22
A3-I/O
2
B3-I/O
––
––
21
A2-I/O
1
B2-I/O
––
––
20
A1-I/O
0
B1-I/O


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