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OR3C80 Datasheet(PDF) 63 Page - Agere Systems |
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OR3C80 Datasheet(HTML) 63 Page - Agere Systems |
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63 / 210 page  Lucent Technologies Inc. 63 Data Sheet June 1999 ORCA Series 3C and 3T FPGAs Special Function Blocks (continued) Boundary-Scan Timing To ensure race-free operation, data changes on specific clock edges. The TMS and TDI inputs are clocked in on the rising edge of TCK, while changes on TDO occur on the falling edge of TCK. In the execution of an EXTEST instruction, parallel data is output from the BSR to the FPGA pads on the falling edge of TCK. The maximum fre- quency allowed for TCK is 10 MHz. Figure 41 shows timing waveforms for an instruction scan operation. The diagram shows the use of TMS to sequence the TAPC through states. The test host (or BSM) changes data on the falling edge of TCK, and it is clocked into the DUT on the rising edge. 5-5971(F) Figure 41. Instruction Register Scan Timing Diagram TCK TMS TDI |
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