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SN74ACT8997 Datasheet(PDF) 8 Page - Texas Instruments |
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SN74ACT8997 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 30 page  SN54ACT8997, SN74ACT8997 SCAN-PATH LINKERS WITH 4-BIT IDENTIFICATION BUSES SCAN-CONTROLLED IEEE STD 1149.1 (JTAG) TAP CONCATENATORS SCAS157D – APRIL 1990 – REVISED DECEMBER 1996 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Table 2. Instruction-Register Opcodes BINARY CODE BIT 7 → BIT 0 MSB → LSB HEX VALUE SCOPE OPCODE DESCRIPTION SELECTED DATA REGISTER MODE 00000000 00 EXTEST Boundary scan Boundary scan Test 10000001 81 BYPASS† Bypass scan Bypass Normal 10000010 82 SAMPLE/PRELOAD Sample boundary Boundary scan Normal 00000011 03 INTEST Boundary scan Boundary scan Test 10000100 84 BYPASS† Bypass scan Bypass Normal 00000101 05 BYPASS† Bypass scan Bypass Normal 00000110 06 BYPASS† Bypass scan Bypass Normal 10000111 87 BYPASS† Bypass scan Bypass Normal 10001000 88 COUNT Count Bypass Normal 00001001 09 COUNT Count Bypass Normal 00001010 0A BYPASS† Bypass scan Bypass Normal 10001011 8B BYPASS† Bypass scan Bypass Normal 00001100 0C BYPASS† Bypass scan Bypass Normal 10001101 8D BYPASS Bypass scan Bypass Normal 10001110 8E SCANCN Control register scan Control Normal 00001111 0F SCANCN Control register scan Control Normal 11111010 FA SCANCNT Counter scan Counter Normal 01111011 7B READCNT Counter read Counter Normal 11111100 FC SCANIDB ID bus register scan ID bus Normal 01111101 7D READIDB ID bus register read ID bus Normal 01111110 7E SCANSEL Select register scan Select Normal All others BYPASS Bypass scan Bypass Normal † A SCOPE opcode exists but is not supported by the ’ACT8997. Table 3. IRERR Function Table NO. OF INSTRUCTION REGISTER BITS = 1 IRERR 0, 2, 4, 6, 8 1 1, 3, 5, 7 0 Table 4. Instruction-Register Status Word IR BIT VALUE† 7 IRERR (see Table 3) 6 0 5 0 4 0 3 DCI (1 = active, 0 = inactive) 2 0 1 0 0 1 † This value is loaded in the instruction register during the Capture-IR TAP state. |
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