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SN74BCT8244ADWRE4 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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SN74BCT8244ADWRE4 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 26 page SN54BCT8244A, SN74BCT8244A SCAN TEST DEVICES WITH OCTAL BUFFERS SCBS042E – FEBRUARY 1990 – REVISED JULY 1996 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 instruction-register opcode description The instruction-register opcodes are shown in Table 2. The following descriptions detail the operation of each instruction. Table 2. Instruction-Register Opcodes BINARY CODE† BIT 7 → BIT 0 MSB → LSB SCOPE OPCODE DESCRIPTION SELECTED DATA REGISTER MODE X0000000 EXTEST/INTEST Boundary scan Boundary scan Test X0000001 BYPASS‡ Bypass scan Bypass Normal X0000010 SAMPLE/PRELOAD Sample boundary Boundary scan Normal X0000011 INTEST/EXTEST Boundary scan Boundary scan Test X0000100 BYPASS‡ Bypass scan Bypass Normal X0000101 BYPASS‡ Bypass scan Bypass Normal X0000110 HIGHZ (TRIBYP) Control boundary to high impedance Bypass Modified test X0000111 CLAMP (SETBYP) Control boundary to 1/0 Bypass Test X0001000 BYPASS‡ Bypass scan Bypass Normal X0001001 RUNT Boundary run test Bypass Test X0001010 READBN Boundary read Boundary scan Normal X0001011 READBT Boundary read Boundary scan Test X0001100 CELLTST Boundary self test Boundary scan Normal X0001101 TOPHIP Boundary toggle outputs Bypass Test X0001110 SCANCN Boundary-control register scan Boundary control Normal X0001111 SCANCT Boundary-control register scan Boundary control Test All others BYPASS Bypass scan Bypass Normal † Bit 7 is a don’t-care bit; X = don’t care. ‡ The BYPASS instruction is executed in lieu of a SCOPE ™ instruction that is not supported in the ’BCT8244A. boundary scan This instruction conforms to the IEEE Standard 1149.1-1990 EXTEST and INTEST instructions. The BSR is selected in the scan path. Data appearing at the device input terminals is captured in the input BSCs, while data appearing at the outputs of the normal on-chip logic is captured in the output BSCs. Data that has been scanned into the input BSCs is applied to the inputs of the normal on-chip logic, while data that has been scanned into the output BSCs is applied to the device output terminals. The device operates in the test mode. bypass scan This instruction conforms to the IEEE Standard 1149.1-1990 BYPASS instruction. The bypass register is selected in the scan path. A logic 0 value is captured in the bypass register during Capture-DR. The device operates in the normal mode. sample boundary This instruction conforms to the IEEE Standard 1149.1-1990 SAMPLE/PRELOAD instruction. The BSR is selected in the scan path. Data appearing at the device input terminals is captured in the input BSCs, while data appearing at the outputs of the normal on-chip logic is captured in the output BSCs. The device operates in the normal mode. |
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