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MPC875EC Datasheet(PDF) 37 Page - Freescale Semiconductor, Inc |
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MPC875EC Datasheet(HTML) 37 Page - Freescale Semiconductor, Inc |
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37 / 84 page  MPC875/MPC870 Hardware Specifications, Rev. 3.0 37 PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE Freescale Semiconductor Bus Signal Timing Table 12 shows the PCMCIA timing for the MPC875/870. Table 12. PCMCIA Timing Num Characteristic 33 MHz 40 MHz 66 MHz 80 MHz Unit Min Max Min Max Min Max Min Max P44 A(0:31), REG valid to PCMCIA strobe asserted 1 (MIN = 0.75 × B1 – 2.00) 1 PSST = 1. Otherwise add PSST times cycle time. PSHT = 0. Otherwise add PSHT times cycle time. These synchronous timings define when the WAITA signals are detected in order to freeze (or relieve) the PCMCIA current cycle. The WAITA assertion will be effective only if it is detected 2 cycles before the PSL timer expiration. See Chapter 16, “PCMCIA Interface,” in the MPC885 PowerQUICC Family User’s Manual. 20.70 — 16.70 — 9.40 — 7.40 — ns P45 A(0:31), REG valid to ALE negation1 (MIN = 1.00 × B1 – 2.00) 28.30 — 23.00 — 13.20 — 10.50 — ns P46 CLKOUT to REG valid (MAX = 0.25 × B1 + 8.00) 7.60 15.60 6.30 14.30 3.80 11.80 3.13 11.13 ns P47 CLKOUT to REG invalid (MIN = 0.25 × B1 + 1.00) 8.60 — 7.30 — 4.80 — 4.125 — ns P48 CLKOUT to CE1, CE2 asserted (MAX = 0.25 × B1 + 8.00) 7.60 15.60 6.30 14.30 3.80 11.80 3.13 11.13 ns P49 CLKOUT to CE1, CE2 negated (MAX = 0.25 × B1 + 8.00) 7.60 15.60 6.30 14.30 3.80 11.80 3.13 11.13 ns P50 CLKOUT to PCOE, IORD, PCWE, IOWR assert time (MAX = 0.00 × B1 + 11.00) — 11.00 — 11.00 — 11.00 — 11.00 ns P51 CLKOUT to PCOE, IORD, PCWE, IOWR negate time (MAX = 0.00 × 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 × B1 + 6.30) 7.60 13.80 6.30 12.50 3.80 10.00 3.13 9.40 ns P53 CLKOUT to ALE negate time (MAX = 0.25 × B1 + 8.00) — 15.60 — 14.30 — 11.80 — 11.13 ns P54 PCWE, IOWR negated to D(0:31) invalid1(MIN – = 0.25 × B1 – 2.00) 5.60 — 4.30 — 1.80 — 1.125 — ns P55 WAITA and WAITB valid to CLKOUT rising edge1 (MIN = 0.00 × B1 + 8.00) 8.00 — 8.00 — 8.00 — 8.00 — ns P56 CLKOUT rising edge to WAITA and WAITB invalid1 (MIN = 0.00 × B1 + 2.00) 2.00 — 2.00 — 2.00 — 2.00 — ns |
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