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MPC852T 数据表(PDF) 14 Page - Freescale Semiconductor, Inc |
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MPC852T 数据表(HTML) 14 Page - Freescale Semiconductor, Inc |
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14 / 80 page  MPC852T PowerQUICC™ Hardware Specifications, Rev. 4 14 Freescale Semiconductor Bus Signal Timing 12 Bus Signal Timing The maximum bus speed that the MPC852T supports is 66 MHz. Table 7 shows the frequency ranges for standard part frequencies. Table 9 provides the bus operation timing for the MPC852T at 33, 40, 50, and 66 MHz. The timing for the MPC852T bus shown assumes a 50-pF load for maximum delays and a 0-pF load for minimum delays. CLKOUT assumes a 100-pF load maximum delay Table 7. Frequency Ranges for Standard Part Frequencies (1:1 Bus Mode) Part Frequency 50 MHz 66 MHz Min Max Min Max Core 40 50 40 66.67 Bus 40 50 40 66.67 Table 8. Frequency Ranges for Standard Part Frequencies (2:1 Bus Mode) Part Frequency 50 MHz 66 MHz 80 MHz 100 MHz Min Max Min Max Min Max Min Max Core 40 50 40 66.67 40 80 40 100 Bus 2:1 20 25 20 33.33 20 40 20 50 Table 9. Bus Operation Timings Num Characteristic 33 MHz 40 MHz 50 MHz 66 MHz Unit Min Max Min Max Min Max Min Max B1 Bus period (CLKOUT) See Table 7 ———————— ns B1a EXTCLK to CLKOUT phase skew—If CLKOUT is an integer multiple of EXTCLK, then the rising edge of EXTCLK is aligned with the rising edge of CLKOUT. For a non-integer multiple of EXTCLK, this synchronization is lost, and the rising edges of EXTCLK and CLKOUT have a continuously varying phase skew. –2 +2 –2 +2 –2 +2 –2 +2 ns B1b CLKOUT frequency jitter peak-to-peak — 1 — 1 — 1 — 1 ns B1c Frequency jitter on EXTCLK1 — 0.50 — 0.50 — 0.50 — 0.50 % B1d CLKOUT phase jitter peak-to-peak for OSCLK ≥ 15 MHz —4 —4 —4 —4 ns CLKOUT phase jitter peak-to-peak for OSCLK < 15 MHz —5 —5 —5 —5 ns B2 CLKOUT pulse width low (MIN = 0.4 × B1, MAX = 0.6 × B1) 12.1 18.2 10.0 15.0 8.0 12.0 6.1 9.1 ns |
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