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SN74ABT18502 Arkusz danych(PDF) 9 Page - Texas Instruments

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Numer części SN74ABT18502
Szczegółowy opis  SCAN TEST DEVICE WITH 18-BIT REGISTERED BUS TRANSCEIVER
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

SN74ABT18502 Arkusz danych(HTML) 9 Page - Texas Instruments

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SN54ABT18502
SCAN TEST DEVICE WITH
18-BIT REGISTERED BUS TRANSCEIVER
SCBS109C – AUGUST 1992 – REVISED AUGUST 1994
4–9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
data register description
boundary-scan register
The boundary-scan register (BSR) is 84 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, BSCs 83–80 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).
Rest values of other BSCs should be considered indeterminate.
The BSR order of scan is from TDI through bits 83 – 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
83
2OEAB
71
2A9-I
53
2A9-O
35
2B9-I
17
2B9-O
82
1OEAB
70
2A8-I
52
2A8-O
34
2B8-I
16
2B8-O
81
2OEBA
69
2A7-I
51
2A7-O
33
2B7-I
15
2B7-O
80
1OEBA
68
2A6-I
50
2A6-O
32
2B6-I
14
2B6-O
79
2CLKAB
67
2A5-I
49
2A5-O
31
2B5-I
13
2B5-O
78
1CLKAB
66
2A4-I
48
2A4-O
30
2B4-I
12
2B4-O
77
2CLKBA
65
2A3-I
47
2A3-O
29
2B3-I
11
2B3-O
76
1CLKBA
64
2A2-I
46
2A2-O
28
2B2-I
10
2B2-O
75
2LEAB
63
2A1-I
45
2A1-O
27
2B1-I
9
2B1-O
74
1LEAB
62
1A9-I
44
1A9-O
26
1B9-I
8
1B9-O
73
2LEBA
61
1A8-I
43
1A8-O
25
1B8-I
7
1B8-O
72
1LEBA
60
1A7-I
42
1A7-O
24
1B7-I
6
1B7-O
––
––
59
1A6-I
41
1A6-O
23
1B6-I
5
1B6-O
––
––
58
1A5-I
40
1A5-O
22
1B5-I
4
1B5-O
––
––
57
1A4-I
39
1A4-O
21
1B4-I
3
1B4-O
––
––
56
1A3-I
38
1A3-O
20
1B3-I
2
1B3-O
––
––
55
1A2-I
37
1A2-O
19
1B2-I
1
1B2-O
––
––
54
1A1-I
36
1A1-O
18
1B1-I
0
1B1-O


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