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SNJ54LVT18502HV Datasheet(PDF) 11 Page - Texas Instruments |
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SNJ54LVT18502HV Datasheet(HTML) 11 Page - Texas Instruments |
11 / 31 page SN54LVT18502 3.3-V ABT SCAN TEST DEVICE WITH 18-BIT UNIVERSAL BUS TRANSCEIVERS SCBS669 – JULY 1996 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 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). |
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