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MPC855T 数据表(PDF) 17 Page - Freescale Semiconductor, Inc |
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MPC855T 数据表(HTML) 17 Page - Freescale Semiconductor, Inc |
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17 / 80 page  MPC860 Family Hardware Specifications, Rev. 7 Freescale Semiconductor 17 Bus Signal Timing B30 CS, WE(0:3) negated to A(0:31), BADDR(28:30) invalid GPCM write access 8 5.58 — 4.25 — 3.00 — 1.79 — ns B30a WE(0:3) negated to A(0:31), BADDR(28:30) invalid GPCM, write access, TRLX = 0, CSNT = 1, CS negated to A(0:31) invalid GPCM write access, TRLX = 0, CSNT =1 ACS = 10, or ACS = 11, EBDF = 0 13.15 — 10.50 — 8.00 — 5.58 — ns B30b WE(0:3) negated to A(0:31), invalid GPCM BADDR(28:30) invalid GPCM write access, TRLX = 1, CSNT = 1. CS negated to A(0:31), Invalid GPCM, write access, TRLX = 1, CSNT = 1, ACS = 10, or ACS = 11, EBDF = 0 43.45 — 35.50 — 28.00 — 20.73 — ns B30c WE(0:3) negated to A(0:31), BADDR(28:30) invalid GPCM write access, TRLX = 0, CSNT = 1. CS negated to A(0:31) invalid GPCM write access, TRLX = 0, CSNT = 1, ACS = 10, ACS = 11, EBDF = 1 8.36 — 6.38 — 4.50 — 2.68 — ns B30d WE(0:3) negated to A(0:31), BADDR(28:30) invalid GPCM write access, TRLX = 1, CSNT =1. CS negated to A(0:31) invalid GPCM write access TRLX = 1, CSNT = 1, ACS = 10, or ACS = 11, EBDF = 1 38.67 — 31.38 — 24.50 — 17.83 — ns B31 CLKOUT falling edge to CS valid—as requested by control bit CST4 in the corresponding word in UPM 1.50 6.00 1.50 6.00 1.50 6.00 1.50 6.00 ns B31a CLKOUT falling edge to CS valid—as requested by control bit CST1 in the corresponding word in UPM 7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.54 ns B31b CLKOUT rising edge to CS valid—as requested by control bit CST2 in the corresponding word in UPM 1.50 8.00 1.50 8.00 1.50 8.00 1.50 8.00 ns B31c CLKOUT rising edge to CS valid—as requested by control bit CST3 in the corresponding word in UPM 7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.04 ns Table 7. Bus Operation Timings (continued) Num Characteristic 33 MHz 40 MHz 50 MHz 66 MHz Unit Min Max Min Max Min Max Min Max |
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