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SN74BCT8240ANTE4 Datasheet(PDF) 7 Page - Texas Instruments |
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SN74BCT8240ANTE4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 26 page SN54BCT8240A, SN74BCT8240A SCAN TEST DEVICES WITH OCTAL INVERTING BUFFERS SCBS067E – FEBRUARY 1990 – REVISED DECEMBER 1996 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Exit1-DR, Exit2-DR The Exit1-DR and Exit2-DR states are temporary states that end a data-register scan. It is possible to return to the Shift-DR state from either Exit1-DR or Exit2-DR without recapturing the data register. On the first falling edge of TCK after entry to Exit1-DR, TDO goes from the active state to the high-impedance state. Pause-DR No specific function is performed in the stable Pause-DR state, in which the TAP controller can remain indefinitely. The Pause-DR state suspends and resumes data-register scan operations without loss of data. Update-DR If the current instruction calls for the selected data register to be updated with current data, then such update occurs on the falling edge of TCK following entry to the Update-DR state. Capture-IR When an instruction-register scan is selected, the TAP controller must pass through the Capture-IR state. In the Capture-IR state, the instruction register captures its current status value. This capture operation occurs on the rising edge of TCK, upon which the TAP controller exits the Capture-IR state. For the ’BCT8240A, the status value loaded in the Capture-IR state is the fixed binary value 10000001. Shift-IR Upon entry to the Shift-IR state, the instruction register is placed in the scan path between TDI and TDO and, on the first falling edge of TCK, TDO goes from the high-impedance state to an active state. TDO enables to the logic level present in the least-significant bit of the instruction register. While in the stable Shift-IR state, instruction data is serially shifted through the instruction register on each TCK cycle. The first shift occurs on the first rising edge of TCK after entry to the Shift-IR state (i.e., no shifting occurs during the TCK cycle in which the TAP controller changes from Capture-IR to Shift-IR or from Exit2-IR to Shift-IR). The last shift occurs on the rising edge of TCK, upon which the TAP controller exits the Shift-IR state. Exit1-IR, Exit2-IR The Exit1-IR and Exit2-IR states are temporary states that end an instruction-register scan. It is possible to return to the Shift-IR state from either Exit1-IR or Exit2-IR without recapturing the instruction register. On the first falling edge of TCK after entry to Exit1-IR, TDO goes from the active state to the high-impedance state. Pause-IR No specific function is performed in the stable Pause-IR state, in which the TAP controller can remain indefinitely. The Pause-IR state suspends and resumes instruction-register scan operations without loss of data. Update-IR The current instruction is updated and takes effect on the falling edge of TCK, following entry to the Update-IR state. |
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