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MPC875 数据表(PDF) 17 Page - Freescale Semiconductor, Inc |
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MPC875 数据表(HTML) 17 Page - Freescale Semiconductor, Inc |
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17 / 84 page  MPC875/MPC870 Hardware Specifications, Rev. 3.0 17 PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE Freescale Semiconductor Bus Signal Timing B8 CLKOUT to A(0:31), BADDR(28:30) RD/WR, BURST, D(0:31) valid (MAX = 0.25 × B1 + 6.3) —13.80 —12.50 —10.00 — 9.43 ns B8a CLKOUT to TSIZ(0:1), REG, RSV, BDIP, PTR valid (MAX = 0.25 × B1 + 6.3) —13.80 —12.50 —10.00 — 9.43 ns B8b CLKOUT to BR, BG, VFLS(0:1), VF(0:2), IWP(0:2), FRZ, LWP(0:1), STS valid 2 (MAX = 0.25 × B1 + 6.3) —13.80 —12.50 —10.00 — 9.43 ns B9 CLKOUT to A(0:31), BADDR(28:30), RD/WR, BURST, D(0:31), TSIZ(0:1), REG, RSV, PTR High-Z (MAX = 0.25 × B1 + 6.3) 7.60 13.80 6.30 12.50 3.80 10.00 3.13 9.43 ns B11 CLKOUT to TS, BB assertion (MAX = 0.25 × B1 + 6.0) 7.60 13.60 6.30 12.30 3.80 9.80 3.13 9.13 ns B11a CLKOUT to TA, BI assertion (when driven by the memory controller or PCMCIA interface) (MAX = 0.00 × B1 + 9.30 1) 2.50 9.30 2.50 9.30 2.50 9.80 2.5 9.3 ns B12 CLKOUT to TS, BB negation (MAX = 0.25 × B1 + 4.8) 7.60 12.30 6.30 11.00 3.80 8.50 3.13 7.92 ns B12a CLKOUT to TA, BI negation (when driven by the memory controller or PCMCIA interface) (MAX = 0.00 × B1 + 9.00) 2.50 9.00 2.50 9.00 2.50 9.00 2.5 9.00 ns B13 CLKOUT to TS, BB High-Z (MIN = 0.25 × B1) 7.60 21.60 6.30 20.30 3.80 14.00 3.13 12.93 ns B13a CLKOUT to TA, BI High-Z (when driven by the memory controller or PCMCIA interface) (MIN = 0.00 × B1 + 2.5) 2.50 15.00 2.50 15.00 2.50 15.00 2.5 15.00 ns B14 CLKOUT to TEA assertion (MAX = 0.00 × B1 + 9.00) 2.50 9.00 2.50 9.00 2.50 9.00 2.50 9.00 ns B15 CLKOUT to TEA High-Z (MIN = 0.00 × B1 + 2.50) 2.50 15.00 2.50 15.00 2.50 15.00 2.50 15.00 ns B16 TA, BI valid to CLKOUT (setup time) (MIN = 0.00 × B1 + 6.00) 6.00 — 6.00 — 6.00 — 6 — ns B16a TEA, KR, RETRY, CR valid to CLKOUT (setup time) (MIN = 0.00 × B1 + 4.5) 4.50 — 4.50 — 4.50 — 4.50 — ns B16b BB, BG, BR, valid to CLKOUT (setup time) 2 (4MIN = 0.00 × B1 + 0.00) 4.00 — 4.00 — 4.00 — 4.00 — ns B17 CLKOUT to TA, TEA, BI, BB, BG, BR valid (hold time) (MIN = 0.00 × B1 + 1.00 3) 1.00 — 1.00 — 2.00 — 2.00 — ns B17a CLKOUT to KR, RETRY, CR valid (hold time) (MIN = 0.00 × B1 + 2.00) 2.00 — 2.00 — 2.00 — 2.00 — ns Table 10. Bus Operation Timings (continued) Num Characteristic 33 MHz 40 MHz 66 MHz 80 MHz Unit Min Max Min Max Min Max Min Max |
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