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MPC875 数据表(PDF) 21 Page - Freescale Semiconductor, Inc |
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MPC875 数据表(HTML) 21 Page - Freescale Semiconductor, Inc |
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21 / 84 page  MPC875/MPC870 Hardware Specifications, Rev. 3.0 21 PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE Freescale Semiconductor Bus Signal Timing B31 CLKOUT falling edge to CS valid, as requested by control bit CST4 in the corresponding word in the UPM (MAX = 0.00 × B1 + 6.00) 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 the UPM (MAX = 0.25 × B1 + 6.80) 7.60 14.30 6.30 13.00 3.80 10.50 3.13 10.00 ns B31b CLKOUT rising edge to CS valid, as requested by control bit CST2 in the corresponding word in the UPM (MAX = 0.00 × B1 + 8.00) 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 the UPM (MAX = 0.25 × B1 + 6.30) 7.60 13.80 6.30 12.50 3.80 10.00 3.13 9.40 ns B31d CLKOUT falling edge to CS valid, as requested by control bit CST1 in the corresponding word in the UPM EBDF = 1 (MAX = 0.375 × B1 + 6.6) 13.30 18.00 11.30 16.00 7.60 12.30 4.69 11.30 ns B32 CLKOUT falling edge to BS valid, as requested by control bit BST4 in the corresponding word in the UPM (MAX = 0.00 × B1 + 6.00) 1.50 6.00 1.50 6.00 1.50 6.00 1.50 6.00 ns B32a CLKOUT falling edge to BS valid, as requested by control bit BST1 in the corresponding word in the UPM, EBDF = 0 (MAX = 0.25 × B1 + 6.80) 7.60 14.30 6.30 13.00 3.80 10.50 3.13 10.00 ns B32b CLKOUT rising edge to BS valid, as requested by control bit BST2 in the corresponding word in the UPM (MAX = 0.00 × B1 + 8.00) 1.50 8.00 1.50 8.00 1.50 8.00 1.50 8.00 ns B32c CLKOUT rising edge to BS valid, as requested by control bit BST3 in the corresponding word in the UPM (MAX = 0.25 × B1 + 6.80) 7.60 14.30 6.30 13.00 3.80 10.50 3.13 10.00 ns B32d CLKOUT falling edge to BS valid, as requested by control bit BST1 in the corresponding word in the UPM, EBDF = 1 (MAX = 0.375 × B1 + 6.60) 13.30 18.00 11.30 16.00 7.60 12.30 4.49 11.30 ns B33 CLKOUT falling edge to GPL valid, as requested by control bit GxT4 in the corresponding word in the UPM (MAX = 0.00 × B1 + 6.00) 1.50 6.00 1.50 6.00 1.50 6.00 1.50 6.00 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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