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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MPC855T 데이터시트(PDF) 34 Page - Freescale Semiconductor, Inc |
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MPC855T 데이터시트(HTML) 34 Page - Freescale Semiconductor, Inc |
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34 / 80 page  MPC860 Family Hardware Specifications, Rev. 7 34 Freescale Semiconductor Bus Signal Timing Table 9 shows the PCMCIA timing for the MPC860. Figure 24 provides the PCMCIA access cycle timing for the external bus read. Table 9. PCMCIA Timing Num Characteristic 33 MHz 40 MHz 50 MHz 66 MHz Unit Min Max Min Max Min Max Min Max P44 A(0:31), REG valid to PCMCIA Strobe asserted 1 1 PSST = 1. Otherwise add PSST times cycle time. PSHT = 0. Otherwise add PSHT times cycle time. These synchronous timings define when the WAITx signals are detected in order to freeze (or relieve) the PCMCIA current cycle. The WAITx assertion will be effective only if it is detected 2 cycles before the PSL timer expiration. See Chapter 16, “PCMCIA Interface,” in the MPC860 PowerQUICC User’s Manual. 20.73 — 16.75 — 13.00 — 9.36 — ns P45 A(0:31), REG valid to ALE negation 1 28.30 — 23.00 — 18.00 — 13.15 — ns P46 CLKOUT to REG valid 7.58 15.58 6.25 14.25 5.00 13.00 3.79 11.84 ns P47 CLKOUT to REG invalid 8.58 — 7.25 — 6.00 — 4.84 — ns P48 CLKOUT to CE1, CE2 asserted 7.58 15.58 6.25 14.25 5.00 13.00 3.79 11.84 ns P49 CLKOUT to CE1, CE2 negated 7.58 15.58 6.25 14.25 5.00 13.00 3.79 11.84 ns P50 CLKOUT to PCOE, IORD, PCWE, IOWR assert time — 11.00 11.00 — 11.00 — 11.00 ns P51 CLKOUT to PCOE, IORD, PCWE, IOWR negate time 2.00 11.00 2.00 11.00 2.00 11.00 2.00 11.00 ns P52 CLKOUT to ALE assert time 7.58 15.58 6.25 14.25 5.00 13.00 3.79 10.04 ns P53 CLKOUT to ALE negate time — 15.58 14.25 — 13.00 — 11.84 ns P54 PCWE, IOWR negated to D(0:31) invalid 1 5.58 — 4.25 — 3.00 — 1.79 — ns P55 WAITA and WAITB valid to CLKOUT rising edge 1 8.00 — 8.00 — 8.00 — 8.00 — ns P56 CLKOUT rising edge to WAITA and WAITB invalid 1 2.00 — 2.00 — 2.00 — 2.00 — ns |
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