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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 PowerQUICC™ Family Hardware Specifications, Rev. 8 Freescale Semiconductor 17 Bus Signal Timing B23 CLKOUT rising edge to CS negated GPCM read access, GPCM write access ACS = 00, TRLX = 0, and CSNT = 0 2.00 8.00 2.00 8.00 2.00 8.00 2.00 8.00 ns B24 A(0:31) and BADDR(28:30) to CS asserted GPCM ACS = 10, TRLX = 0 5.58 — 4.25 — 3.00 — 1.79 — ns B24a A(0:31) and BADDR(28:30) to CS asserted GPCM ACS = 11, TRLX = 0 13.15 — 10.50 — 8.00 — 5.58 — ns B25 CLKOUT rising edge to OE, WE(0:3) asserted — 9.00 — 9.00 — 9.00 — 9.00 ns B26 CLKOUT rising edge to OE negated 2.00 9.00 2.00 9.00 2.00 9.00 2.00 9.00 ns B27 A(0:31) and BADDR(28:30) to CS asserted GPCM ACS = 10, TRLX = 1 35.88 — 29.25 — 23.00 — 16.94 — ns B27a A(0:31) and BADDR(28:30) to CS asserted GPCM ACS = 11, TRLX = 1 43.45 — 35.50 — 28.00 — 20.73 — ns B28 CLKOUT rising edge to WE(0:3) negated GPCM write access CSNT = 0 — 9.00 — 9.00 — 9.00 — 9.00 ns B28a CLKOUT falling edge to WE(0:3) negated GPCM write access TRLX = 0, 1, CSNT = 1, EBDF = 0 7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.54 ns B28b CLKOUT falling edge to CS negated GPCM write access TRLX = 0, 1, CSNT = 1, ACS = 10, or ACS = 11, EBDF = 0 — 14.33 — 13.00 — 11.75 — 10.54 ns B28c CLKOUT falling edge to WE(0:3) negated GPCM write access TRLX = 0, 1, CSNT = 1 write access TRLX = 0, CSNT = 1, EBDF = 1 10.86 17.99 8.88 16.00 7.00 14.13 5.18 12.31 ns B28d CLKOUT falling edge to CS negated GPCM write access TRLX = 0, 1, CSNT = 1, ACS = 10, or ACS = 11, EBDF = 1 — 17.99 — 16.00 — 14.13 — 12.31 ns B29 WE(0:3) negated to D(0:31), DP(0:3) High-Z GPCM write access CSNT = 0, EBDF = 0 5.58 — 4.25 — 3.00 — 1.79 — ns B29a WE(0:3) negated to D(0:31), DP(0:3) High-Z GPCM write access, TRLX = 0, CSNT = 1, EBDF = 0 13.15 — 10.5 — 8.00 — 5.58 — ns B29b CS negated to D(0:31), DP(0:3), High-Z GPCM write access, ACS = 00, TRLX = 0, 1, and CSNT = 0 5.58 — 4.25 — 3.00 — 1.79 — ns B29c CS negated to D(0:31), DP(0:3) High-Z GPCM write access, TRLX = 0, CSNT = 1, ACS = 10, or ACS = 11, EBDF = 0 13.15 — 10.5 — 8.00 — 5.58 — 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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