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SN74BCT8373DW Datenblatt(PDF) 10 Page - Texas Instruments |
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SN74BCT8373DW Datenblatt(HTML) 10 Page - Texas Instruments |
10 / 21 page SN74BCT8373 SCAN TEST DEVICE WITH OCTAL DTYPE LATCHES SCBS471 − JUNE 1990 − REVISED JUNE 1994 2−10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 bypass register The bypass register is a 1-bit scan path that can be selected to shorten the length of the system scan path, thereby 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 illustrated in Figure 4. Bit 0 TDO TDI Figure 4. Bypass Register Order of Scan 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 Boundary scan Boundary scan Test X0000001 BYPASS‡ Bypass scan Bypass Normal X0000010 SAMPLE/PRELOAD Sample boundary Boundary scan Normal X0000011 INTEST 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 SN74BCT8373. |
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