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MPC875 数据表(PDF) 19 Page - Freescale Semiconductor, Inc |
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MPC875 数据表(HTML) 19 Page - Freescale Semiconductor, Inc |
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19 / 84 page  MPC875/MPC870 Hardware Specifications, Rev. 3.0 19 PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE Freescale Semiconductor Bus Signal Timing B28 CLKOUT rising edge to WE(0:3)/BS_B[0:3] negated GPCM write access CSNT = 0 (MAX = 0.00 × B1 + 9.00) — 9.00 — 9.00 — 9.00 — 9.00 ns B28a CLKOUT falling edge to WE(0:3)/BS_B[0:3] negated GPCM write access TRLX = 0, CSNT = 1, EBDF = 0 (MAX = 0.25 × B1 + 6.80) 7.60 14.30 6.30 13.00 3.80 10.50 3.13 9.93 ns B28b CLKOUT falling edge to CS negated GPCM write access TRLX = 0, CSNT = 1 ACS = 10 or ACS = 11, EBDF = 0 (MAX = 0.25 × B1 + 6.80) —14.30 —13.00 —10.50 — 9.93 ns B28c CLKOUT falling edge to WE(0:3)/BS_B[0:3] negated GPCM write access TRLX = 0, CSNT = 1 write access TRLX = 0, CSNT = 1, EBDF = 1 (MAX = 0.375 × B1 + 6.6) 10.90 18.00 10.90 18.00 5.20 12.30 4.69 11.29 ns B28d CLKOUT falling edge to CS negated GPCM write access TRLX = 0, CSNT = 1, ACS = 10, or ACS = 11, EBDF = 1 (MAX = 0.375 × B1 + 6.6) — 18.00 — 18.00 — 12.30 — 11.30 ns B29 WE(0:3)/BS_B[0:3] negated to D(0:31) High-Z GPCM write access, CSNT = 0, EBDF = 0 (MIN = 0.25 × B1 – 2.00) 5.60 — 4.30 — 1.80 — 1.13 — ns B29a WE(0:3)/BS_B[0:3] negated to D(0:31) High-Z GPCM write access, TRLX = 0, CSNT = 1, EBDF = 0 (MIN = 0.50 × B1 – 2.00) 13.20 — 10.50 — 5.60 — 4.25 — ns B29b CS negated to D(0:31) High-Z GPCM write access, ACS = 00, TRLX = 0 & CSNT = 0 (MIN = 0.25 × B1 – 2.00) 5.60 — 4.30 — 1.80 — 1.13 — ns B29c CS negated to D(0:31) High-Z GPCM write access, TRLX = 0, CSNT = 1, ACS = 10, or ACS = 11 EBDF = 0 (MIN = 0.50 × B1 – 2.00) 13.20 — 10.50 — 5.60 — 4.25 — ns B29d WE(0:3)/BS_B[0:3] negated to D(0:31) High-Z GPCM write access, TRLX = 1, CSNT = 1, EBDF = 0 (MIN = 1.50 × B1 – 2.00) 43.50 — 35.50 — 20.70 — 16.75 — ns B29e CS negated to D(0:31) High-Z GPCM write access, TRLX = 1, CSNT = 1, ACS = 10, or ACS = 11, EBDF = 0 (MIN = 1.50 × B1 – 2.00) 43.50 — 35.50 — 20.70 — 16.75 — 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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