Datenblatt-Suchmaschine für elektronische Bauteile |
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SN74ABT18502PM Datenblatt(PDF) 10 Page - Texas Instruments |
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SN74ABT18502PM Datenblatt(HTML) 10 Page - Texas Instruments |
10 / 28 page SN74ABT18502 SCAN TEST DEVICE WITH 18-BIT REGISTERED BUS TRANSCEIVER SCBS753 – FEBRUARY 2002 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 boundary-control register (BCR) The BCR is 21 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, PSA with input masking, and binary count up (COUNT). Table 5 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 000000000000000000010, which selects the PSA test operation with no input masking. The BCR order of scan is from TDI through bits 20–0 to TDO. Table 2 shows the BCR bits and their associated test control signals. Table 2. BCR Configuration BCR BIT NUMBER TEST CONTROL SIGNAL BCR BIT NUMBER TEST CONTROL SIGNAL BCR BIT NUMBER TEST CONTROL SIGNAL 20 MASK2.9 11 MASK1.9 2 OPCODE2 19 MASK2.8 10 MASK1.8 1 OPCODE1 18 MASK2.7 9 MASK1.7 0 OPCODE0 17 MASK2.6 8 MASK1.6 –– –– 16 MASK2.5 7 MASK1.5 –– –– 15 MASK2.4 6 MASK1.4 –– –– 14 MASK2.3 5 MASK1.3 –– –– 13 MASK2.2 4 MASK1.2 –– –– 12 MASK2.1 3 MASK1.1 –– –– 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 3. Bit 0 TDO TDI Figure 3. Bypass Register Order of Scan device identification register (IDR) The device IDR is 32 bits long. It can be selected and read to identify the manufacturer, part number, and version of this device. During Capture-DR, the binary value 00000000000000000110000000101111 (0000602F, hex) is captured in the device IDR to identify this device as the TI SN74ABT18502, version 0. The device IDR order of scan is from TDO through bits 31–0 to TDO. Table 3 shows the device IDR bits and their significance. |
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