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SN74ABTH182504APM Folha de dados(PDF) 10 Page - Texas Instruments |
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SN74ABTH182504APM Folha de dados(HTML) 10 Page - Texas Instruments |
10 / 35 page SN54ABTH18504A, SN54ABTH182504A, SN74ABTH18504A, SN74ABTH182504A SCAN TEST DEVICES WITH 20-BIT UNIVERSAL BUS TRANSCEIVERS SCBS165C – AUGUST 1993 – REVISED JULY 1996 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 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 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 OEAB 39 A20-I/O 19 B20-I/O 46 OEBA 38 A19-I/O 18 B19-I/O 45 CLKAB 37 A18-I/O 17 B18-I/O 44 CLKBA 36 A17-I/O 16 B17-I/O 43 CLKENAB 35 A16-I/O 15 B16-I/O 42 CLKENBA 34 A15-I/O 14 B15-I/O 41 LEAB 33 A14-I/O 13 B14-I/O 40 LEBA 32 A13-I/O 12 B13-I/O –– –– 31 A12-I/O 11 B12-I/O –– –– 30 A11-I/O 10 B11-I/O –– –– 29 A10-I/O 9 B10-I/O –– –– 28 A9-I/O 8 B9-I/O –– –– 27 A8-I/O 7 B8-I/O –– –– 26 A7-I/O 6 B7-I/O –– –– 25 A6-I/O 5 B6-I/O –– –– 24 A5-I/O 4 B5-I/O –– –– 23 A4-I/O 3 B4-I/O –– –– 22 A3-I/O 2 B3-I/O –– –– 21 A2-I/O 1 B2-I/O –– –– 20 A1-I/O 0 B1-I/O |
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