OR3T125-5BA352 AGERE [Agere Systems], OR3T125-5BA352 Datasheet - Page 63
OR3T125-5BA352
Manufacturer Part Number
OR3T125-5BA352
Description
3C and 3T Field-Programmable Gate Arrays
Manufacturer
AGERE [Agere Systems]
Datasheet
1.OR3T125-5BA352.pdf
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Data Sheet
June 1999
Lucent Technologies Inc.
Special Function Blocks
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.
TCK
TMS
TDI
Figure 41. Instruction Register Scan Timing Diagram
(continued)
ORCA Series 3C and 3T FPGAs
5-5971(F)
63
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