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MPC852T 数据表(PDF) 21 Page - Freescale Semiconductor, Inc |
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MPC852T 数据表(HTML) 21 Page - Freescale Semiconductor, Inc |
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21 / 80 page  MPC852T PowerQUICC™ Hardware Specifications, Rev. 4 Freescale Semiconductor 21 Bus Signal Timing B35b A(0:31), BADDR(28:30), and D(0:31) to BS valid - as requested by control bit BST2 in the corresponding word in the UPM (MIN = 0.75 × B1 – 2.00) 20.70 — 16.70 — 13.00 — 9.40 — ns B36 A(0:31), BADDR(28:30), and D(0:31) to GPL valid as requested by control bit GxT4 in the corresponding word in the UPM (MIN = 0.25 × B1 – 2.00) 5.60 — 4.30 — 3.00 — 1.80 — ns B37 UPWAIT valid to CLKOUT falling edge10 (MIN = 0.00 × B1 + 6.00) 6.00 — 6.00 — 6.00 — 6.00 — ns B38 CLKOUT falling edge to UPWAIT valid10 (MIN = 0.00 × B1 + 1.00) 1.00 — 1.00 — 1.00 — 1.00 — ns B39 AS valid to CLKOUT rising edge11 (MIN = 0.00 × B1 + 7.00) 7.00 — 7.00 — 7.00 — 7.00 — ns B40 A(0:31), TSIZ(0:1), RD/WR, BURST, valid to CLKOUT rising edge (MIN = 0.00 × B1 + 7.00) 7.00 — 7.00 — 7.00 — 7.00 — ns B41 TS valid to CLKOUT rising edge (setup time) (MIN = 0.00 × B1 + 7.00) 7.00 — 7.00 — 7.00 — 7.00 — ns B42 CLKOUT rising edge to TS valid (hold time) (MIN = 0.00 × B1 + 2.00) 2.00 — 2.00 — 2.00 — 2.00 — ns B43 AS negation to memory controller signals negation (MAX = TBD) —TBD —TBD —TBD —TBD ns 1 If the rate of change of the frequency of EXTAL is slow (that is, it does not jump between the minimum and maximum values in one cycle) or the frequency of the jitter is fast (that is, it does not stay at an extreme value for a long time), then the maximum allowed jitter on EXTAL can be up to 2%. 2 For part speeds above 50MHz, use 9.80ns for B11a. 3 The timing required for BR input is relevant when the MPC852T is selected to work with internal bus arbiter. The timing for BG input is relevant when the MPC852T is selected to work with external bus arbiter. 4 For part speeds above 50MHz, use 2ns for B17. 5 The D(0:31) and DP(0:3) input timings B18 and B19 refer to the rising edge of the CLKOUT in which the TA input signal is asserted. 6 For part speeds above 50MHz, use 2ns for B19. 7 The D(0:31) and DP(0:3) input timings B20 and B21 refer to the falling edge of the CLKOUT. This timing is valid only for read accesses controlled by chip-selects under control of the UPM in the memory controller, for data beats where DLT3 = 1 in the UPM RAM words. (This is only the case where data is latched on the falling edge of CLKOUT.) 8 This formula applies to bus operation up to 50 MHz. 9 The timing B30 refers to CS when ACS = 00 and to WE(0:3) when CSNT = 0. 10 The signal UPWAIT is considered asynchronous to the CLKOUT and synchronized internally. The timings specified in B37 and B38 are specified to enable the freeze of the UPM output signals as described in Figure 19. 11 The AS signal is considered asynchronous to the CLKOUT. The timing B39 is specified in order to allow the behavior specified in Figure 22. Table 9. 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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