SN54LVT18502

3.3-V ABT SCAN TEST DEVICE

WITH 18-BIT UNIVERSAL BUS TRANSCEIVERS

SCBS669 – JULY 1996

11

POST OFFICE BOX 655303

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.

For the SN54LVT18502, the binary value 00010000000000011100000000101111 (1001C02F, hex) is captured

(during Capture-DR state) in the IDR to identify this device as Texas Instruments SN54LVT18502.

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).