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SN74ABTH18652A Datenblatt(PDF) 11 Page - Texas Instruments

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Teilenummer SN74ABTH18652A
Bauteilbeschribung  SCAN TEST DEVICES WITH 18-BIT BUS TRANSCEIVERS AND REGISTERS
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SN54ABTH18652A, SN54ABTH182652A, SN74ABTH18652A, SN74ABTH182652A
SCAN TEST DEVICES WITH
18BIT BUS TRANSCEIVERS AND REGISTERS
SCBS167D − AUGUST 1993 − REVISED JULY 1996
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
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 0, while BSCs 45−44 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
2OEAB
35
2A9-I/O
17
2B9-I/O
46
1OEAB
34
2A8-I/O
16
2B8-I/O
45
2OEBA
33
2A7-I/O
15
2B7-I/O
44
1OEBA
32
2A6-I/O
14
2B6-I/O
43
2CLKAB
31
2A5-I/O
13
2B5-I/O
42
1CLKAB
30
2A4-I/O
12
2B4-I/O
41
2CLKBA
29
2A3-I/O
11
2B3-I/O
40
1CLKBA
28
2A2-I/O
10
2B2-I/O
39
2SAB
27
2A1-I/O
9
2B1-I/O
38
1SAB
26
1A9-I/O
8
1B9-I/O
37
2SBA
25
1A8-I/O
7
1B8-I/O
36
1SBA
24
1A7-I/O
6
1B7-I/O
−−
−−
23
1A6-I/O
5
1B6-I/O
−−
−−
22
1A5-I/O
4
1B5-I/O
−−
−−
21
1A4-I/O
3
1B4-I/O
−−
−−
20
1A3-I/O
2
1B3-I/O
−−
−−
19
1A2-I/O
1
1B2-I/O
−−
−−
18
1A1-I/O
0
1B1-I/O


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