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ISPLSI5128VE Datasheet(PDF) 7 Page - Lattice Semiconductor |
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ISPLSI5128VE Datasheet(HTML) 7 Page - Lattice Semiconductor |
7 / 21 page Specifications ispLSI 5128VE 7 Global Clock Distribution The ispLSI 5000VE Family has four dedicated clock input pins: CLK0 - CLK3. CLK0 input is used as the dedicated master clock that has the lowest internal clock skew with no clock inversion to maintain the fastest internal clock speed. The clock inversion is available on the remaining CLK1 - CLK3 signals. By sharing the pins with the I/O pins, CLK2 and CLK3 can not only be inverted but are also available for logic implementation through GRP signal routing. Figure 5 shows these different clock distribution options. Figure 5. ispLSI 5000VE Global Clock Structure CLK0 CLK1 CLK 0 (dedicated pin) CLK 1 (dedicated pin) IO/CLK 2 (shared pin) IO/CLK 3 (shared pin) CLK2 CLK3 to/from GRP Global Reset RESET (dedicated pin) to/from GRP IO0/TOE (shared pin) TOE to/from GRP |
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