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SN74ABT18502 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 SN74ABT18502
상세설명  SCAN TEST DEVICE WITH 18-BIT REGISTERED BUS TRANSCEIVER
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SN74ABT18502 데이터시트(HTML) 9 Page - Texas Instruments

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SN74ABT18502
SCAN TEST DEVICE
WITH 18-BIT REGISTERED BUS TRANSCEIVER
SCBS753 – FEBRUARY 2002
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
data register (DR)
boundary-scan register (BSR)
The BSR is 84 bits long. It contains one 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 83–80, which 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. BSR 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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