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SN74BCT8240ADWR 데이터시트(PDF) 9 Page - Texas Instruments |
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SN74BCT8240ADWR 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 26 page SN54BCT8240A, SN74BCT8240A SCAN TEST DEVICES WITH OCTAL INVERTING BUFFERS SCBS067E – FEBRUARY 1990 – REVISED DECEMBER 1996 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Table 1. Boundary-Scan Register Configuration BSR BIT NUMBER DEVICE SIGNAL BSR BIT NUMBER DEVICE SIGNAL BSR BIT NUMBER DEVICE SIGNAL 17 1OE 15 1A1 7 1Y1 16 2OE 14 1A2 6 1Y2 –– –– 13 1A3 5 1Y3 –– –– 12 1A4 4 1Y4 –– –– 11 2A1 3 2Y1 –– –– 10 2A2 2 2Y2 –– –– 9 2A3 1 2Y3 –– –– 8 2A4 0 2Y4 boundary-control register The boundary-control register (BCR) is two bits long. The BCR is used in the context of the RUNT instruction to implement additional test operations not included in the basic SCOPE ™ instruction set. Such operations include PRPG and PSA. Table 3 shows the test operations that are decoded by the BCR. During Capture-DR, the contents of the BCR are not changed. At power up or in Test-Logic-Reset, the BCR is reset to the binary value 10, which selects the PSA test operation. The BCR order of scan is shown in Figure 3. TDO TDI Bit 0 (LSB) Bit 1 (MSB) Figure 3. Boundary-Control Register Order of Scan 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 shown 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. |
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