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SN74ABT18502 Folha de dados(PDF) 11 Page - Texas Instruments |
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SN74ABT18502 Folha de dados(HTML) 11 Page - Texas Instruments |
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11 / 28 page  SN74ABT18502 SCAN TEST DEVICE WITH 18-BIT REGISTERED BUS TRANSCEIVER SCBS753 – FEBRUARY 2002 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Table 3. Device IDR 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 IDR always contains the binary value 000000101111 (02F, hex). instruction-register (IR) opcode The IR opcodes are shown in Table 4. The following descriptions detail the operation of each instruction. Table 4. IR Opcodes BINARY CODE‡ BIT 7 → BIT 0 MSB → LSB SCOPE OPCODE DESCRIPTION SELECTED DR MODE 00000000 EXTEST Boundary scan Boundary scan Test 10000001 IDCODE Identification read Device identification Normal 10000010 SAMPLE/PRELOAD Sample boundary Boundary scan Normal 00000011 INTEST Boundary scan Boundary scan Test 10000100 BYPASS§ Bypass scan Bypass Normal 00000101 BYPASS§ Bypass scan Bypass Normal 00000110 HIGHZ Control boundary to high impedance Bypass Modified test 10000111 CLAMP Control boundary to 1/0 Bypass Test 10001000 BYPASS§ Bypass scan Bypass Normal 00001001 RUNT Boundary run test Bypass Test 00001010 READBN Boundary read Boundary scan Normal 10001011 READBT Boundary read Boundary scan Test 00001100 CELLTST Boundary self test Boundary scan Normal 10001101 TOPHIP Boundary toggle outputs Bypass Test 10001110 SCANCN BCR scan Boundary control Normal 00001111 SCANCT BCR scan Boundary control Test All others BYPASS Bypass scan Bypass Normal ‡ Bit 7 is used to maintain even parity in the 8-bit instruction. § The BYPASS instruction is executed in lieu of a SCOPE instruction that is not supported in the SN74ABT18502. |
Nº de peça semelhante - SN74ABT18502 |
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Descrição semelhante - SN74ABT18502 |
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