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SN74ABTH18652A Folha de dados(PDF) 11 Page - Texas Instruments |
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SN74ABTH18652A Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 39 page SN54ABTH18652A, SN54ABTH182652A, SN74ABTH18652A, SN74ABTH182652A SCAN TEST DEVICES WITH 18BIT BUS TRANSCEIVERS AND REGISTERS SCBS167D − AUGUST 1993 − REVISED JULY 1996 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 data register description boundary-scan register The boundary-scan register (BSR) is 48 bits long. It contains one boundary-scan cell (BSC) for each normal-function input pin and one BSC for each normal-function I/O pin (one single cell for both input data and output data). The BSR is used 1) to store test data that is to be applied externally to the device output pins, and/or 2) to capture data that appears internally at the outputs of the normal on-chip logic and/or externally at the device input pins. The source of data to be captured into the BSR during Capture-DR is determined by the current instruction. The contents of the BSR can change during Run-Test/Idle as determined by the current instruction. At power up or in Test-Logic-Reset, BSCs 47 −46 are reset to logic 0, while BSCs 45−44 are reset to logic 1, ensuring that these cells, which control A-port and B-port outputs, are set to benign values (i.e., if test mode were invoked, the outputs would be at high-impedance state). Reset values of other BSCs should be considered indeterminate. The BSR order of scan is from TDI through bits 47−0 to TDO. Table 1 shows the BSR bits and their associated device pin signals. Table 1. Boundary-Scan Register Configuration BSR BIT NUMBER DEVICE SIGNAL BSR BIT NUMBER DEVICE SIGNAL BSR BIT NUMBER DEVICE SIGNAL 47 2OEAB 35 2A9-I/O 17 2B9-I/O 46 1OEAB 34 2A8-I/O 16 2B8-I/O 45 2OEBA 33 2A7-I/O 15 2B7-I/O 44 1OEBA 32 2A6-I/O 14 2B6-I/O 43 2CLKAB 31 2A5-I/O 13 2B5-I/O 42 1CLKAB 30 2A4-I/O 12 2B4-I/O 41 2CLKBA 29 2A3-I/O 11 2B3-I/O 40 1CLKBA 28 2A2-I/O 10 2B2-I/O 39 2SAB 27 2A1-I/O 9 2B1-I/O 38 1SAB 26 1A9-I/O 8 1B9-I/O 37 2SBA 25 1A8-I/O 7 1B8-I/O 36 1SBA 24 1A7-I/O 6 1B7-I/O −− −− 23 1A6-I/O 5 1B6-I/O −− −− 22 1A5-I/O 4 1B5-I/O −− −− 21 1A4-I/O 3 1B4-I/O −− −− 20 1A3-I/O 2 1B3-I/O −− −− 19 1A2-I/O 1 1B2-I/O −− −− 18 1A1-I/O 0 1B1-I/O |
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