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SN74ABT18245ADLG4 Fiches technique(PDF) 10 Page - Texas Instruments

No de pièce SN74ABT18245ADLG4
Description  SCAN TEST DEVICES WITH 18-BIT BUS TRANSCEIVERS
Download  32 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

SN74ABT18245ADLG4 Fiches technique(HTML) 10 Page - Texas Instruments

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SN54ABT18245A, SN74ABT18245A
SCAN TEST DEVICES
WITH 18-BIT BUS TRANSCEIVERS
SCBS110H – AUGUST 1992 – REVISED FEBRUARY 1999
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
bypass register
The bypass register is a 1-bit scan path that can be selected to shorten the length of the system scan path,
reducing the number of bits per test pattern that must be applied to complete a test operation. During
Capture-DR, the bypass register captures a logic 0. The bypass register order of scan is shown in
Figure 4.
Bit 0
TDO
TDI
Figure 4. Bypass Register Order of Scan
device-identification register
The device-identification register (IDR) is 32 bits long. It can be selected and read to identify the manufacturer,
part number, and version of this device.
During Capture-DR, the binary value 00010000000000000101000000101111 (1000502F, hex) is captured in
the IDR to identify this device as Texas Instruments SN54/74ABT18245A. The IDR order of scan is from TDI
through bits 31–0 to TDO. Table 2 shows the IDR bits and their significance.
Table 2. Device-Identification Register Configuration
IDR BIT
NUMBER
IDENTIFICATION
SIGNIFICANCE
IDR BIT
NUMBER
IDENTIFICATION
SIGNIFICANCE
IDR BIT
NUMBER
IDENTIFICATION
SIGNIFICANCE
31
VERSION3
27
PARTNUMBER15
11
MANUFACTURER10†
30
VERSION2
26
PARTNUMBER14
10
MANUFACTURER09†
29
VERSION1
25
PARTNUMBER13
9
MANUFACTURER08†
28
VERSION0
24
PARTNUMBER12
8
MANUFACTURER07†
23
PARTNUMBER11
7
MANUFACTURER06†
22
PARTNUMBER10
6
MANUFACTURER05†
21
PARTNUMBER09
5
MANUFACTURER04†
20
PARTNUMBER08
4
MANUFACTURER03†
19
PARTNUMBER07
3
MANUFACTURER02†
18
PARTNUMBER06
2
MANUFACTURER01†
17
PARTNUMBER05
1
MANUFACTURER00†
16
PARTNUMBER04
0
LOGIC1†
15
PARTNUMBER03
14
PARTNUMBER02
13
PARTNUMBER01
12
PARTNUMBER00
† Note that for TI products, bits 11–0 of the device-identification register always contain the binary value 000000101111
(02F, hex).


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