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SN74ABT8245DWRE4 데이터시트(PDF) 9 Page - Texas Instruments |
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SN74ABT8245DWRE4 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 30 page SN54ABT8245, SN74ABT8245 SCAN TEST DEVICES WITH OCTAL BUS TRANSCEIVERS SCBS124D – AUGUST 1992 – REVISED DECEMBER 1996 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 data register description boundary-scan register The boundary-scan register (BSR) is 36 bits long. It contains one boundary-scan cell (BSC) for each normal-function input pin, two BSCs for each normal-function I/O pin (one for input data and one for output data), and one BSC for each of the internally decoded output-enable signals (OEA and OEB). The BSR is used 1) to store test data that is to be applied internally to the inputs of the normal on-chip logic and/or 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, the value of each BSC is reset to logic 0. When external data is to be captured, the BSCs for signals OEA and OEB capture logic values determined by the following positive-logic equations: OEA = OE • DIR, and OEB = OE • DIR . When data is to be applied externally, these BSCs control the drive state (active or high-impedance) of their respective outputs. The BSR order of scan is from TDI through bits 35 – 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 BSR BIT NUMBER DEVICE SIGNAL BSR BIT NUMBER DEVICE SIGNAL 35 OEB 31 B8-I 23 B8-O 15 A8-I 7 A8-O 34 OEA 30 B7-I 22 B7-O 14 A7-I 6 A7-O 33 DIR 29 B6-I 21 B6-O 13 A6-I 5 A6-O 32 OE 28 B5-I 20 B5-O 12 A5-I 4 A5-O –– –– 27 B4-I 19 B4-O 11 A4-I 3 A4-O –– –– 26 B3-I 18 B3-O 10 A3-I 2 A3-O –– –– 25 B2-I 17 B2-O 9 A2-I 1 A2-O –– –– 24 B1-I 16 B1-O 8 A1-I 0 A1-O |
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