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MPC855T データシート(PDF) 15 Page - Freescale Semiconductor, Inc |
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MPC855T データシート(HTML) 15 Page - Freescale Semiconductor, Inc |
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15 / 80 page  MPC860 PowerQUICC™ Family Hardware Specifications, Rev. 8 Freescale Semiconductor 15 Bus Signal Timing 9 Bus Signal Timing Table 7 provides the bus operation timing for the MPC860 at 33, 40, 50, and 66 MHz. The maximum bus speed supported by the MPC860 is 66 MHz. Higher-speed parts must be operated in half-speed bus mode (for example, an MPC860 used at 80 MHz must be configured for a 40-MHz bus). The timing for the MPC860 bus shown assumes a 50-pF load for maximum delays and a 0-pF load for minimum delays. Table 7. Bus Operation Timings Num Characteristic 33 MHz 40 MHz 50 MHz 66 MHz Unit Min Max Min Max Min Max Min Max B1 CLKOUT period 30.30 30.30 25.00 30.30 20.00 30.30 15.15 30.30 ns B1a EXTCLK to CLKOUT phase skew (EXTCLK > 15 MHz and MF <= 2) –0.90 0.90 –0.90 0.90 –0.90 0.90 –0.90 0.90 ns B1b EXTCLK to CLKOUT phase skew (EXTCLK > 10 MHz and MF < 10) –2.30 2.30 –2.30 2.30 –2.30 2.30 –2.30 2.30 ns B1c CLKOUT phase jitter (EXTCLK > 15 MHz and MF <= 2)1 –0.60 0.60 –0.60 0.60 –0.60 0.60 –0.60 0.60 ns B1d CLKOUT phase jitter1 –2.00 2.00 –2.00 2.00 –2.00 2.00 –2.00 2.00 ns B1e CLKOUT frequency jitter (MF < 10)1 — 0.50 — 0.50 — 0.50 — 0.50 % B1f CLKOUT frequency jitter (10 < MF < 500)1 — 2.00 — 2.00 — 2.00 — 2.00 % B1g CLKOUT frequency jitter (MF > 500)1 — 3.00 — 3.00 — 3.00 — 3.00 % B1h Frequency jitter on EXTCLK2 — 0.50 — 0.50 — 0.50 — 0.50 % B2 CLKOUT pulse width low 12.12 — 10.00 — 8.00 — 6.06 — ns B3 CLKOUT width high 12.12 — 10.00 — 8.00 — 6.06 — ns B4 CLKOUT rise time3 — 4.00 — 4.00 — 4.00 — 4.00 ns B533 CLKOUT fall time3 — 4.00 — 4.00 — 4.00 — 4.00 ns B7 CLKOUT to A(0:31), BADDR(28:30), RD/WR, BURST, D(0:31), DP(0:3) invalid 7.58 — 6.25 — 5.00 — 3.80 — ns B7a CLKOUT to TSIZ(0:1), REG, RSV, AT(0:3), BDIP, PTR invalid 7.58 — 6.25 — 5.00 — 3.80 — ns B7b CLKOUT to BR, BG, FRZ, VFLS(0:1), VF(0:2) IWP(0:2), LWP(0:1), STS invalid 4 7.58 — 6.25 — 5.00 — 3.80 — ns B8 CLKOUT to A(0:31), BADDR(28:30) RD/WR, BURST, D(0:31), DP(0:3) valid 7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.04 ns B8a CLKOUT to TSIZ(0:1), REG, RSV, AT(0:3) BDIP, PTR valid 7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.04 ns B8b CLKOUT to BR, BG, VFLS(0:1), VF(0:2), IWP(0:2), FRZ, LWP(0:1), STS valid 4 7.58 14.33 6.25 13.00 5.00 11.75 3.80 10.04 ns |
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