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MPC866P 数据表(PDF) 39 Page - Freescale Semiconductor, Inc |
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MPC866P 数据表(HTML) 39 Page - Freescale Semiconductor, Inc |
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39 / 96 page  MPC866/MPC859 Hardware Specifications, Rev. 2 Freescale Semiconductor 39 Bus Signal Timing P50 CLKOUT to PCOE, IORD, PCWE, IOWR assert time (MAX = 0.00 x B1 + 11.00) — 11.00 — 11.00 — 11.00 — 11.00 ns P51 CLKOUT to PCOE, IORD, PCWE, IOWR negate time (MAX = 0.00 x B1 + 11.00) 2.00 11.00 2.00 11.00 2.00 11.00 2.00 11.00 ns P52 CLKOUT to ALE assert time (MAX = 0.25 x B1 + 6.30) 7.60 13.80 6.30 12.50 5.00 11.30 3.80 10.00 ns P53 CLKOUT to ALE negate time (MAX = 0.25 x B1 + 8.00) — 15.60 — 14.30 — 13.00 — 11.80 ns P54 PCWE, IOWR negated to D(0:31) invalid1 (MIN = 0.25 x B1 – 2.00) 5.60 — 4.30 — 3.00 — 1.80 — ns P55 WAITA and WAITB valid to CLKOUT rising edge1 (MIN = 0.00 x B1 + 8.00) 8.00 — 8.00 — 8.00 — 8.00 — ns P56 CLKOUT rising edge to WAITA and WAITB invalid1 (MIN = 0.00 x B1 + 2.00) 2.00 — 2.00 — 2.00 — 2.00 — ns 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 PCMCIA Interface in the MPC866 PowerQUICC User’s Manual. Table 11. PCMCIA Timing (continued) Num Characteristic 33 MHz 40 MHz 50 MHz 66 MHz Unit Min Max Min Max Min Max Min Max |
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