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SN74ABT18245ADL データシート(PDF) 10 Page - Texas Instruments |
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SN74ABT18245ADL データシート(HTML) 10 Page - Texas Instruments |
10 / 34 page 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). |
同様の部品番号 - SN74ABT18245ADL |
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同様の説明 - SN74ABT18245ADL |
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