MPC875CVR133 datasheet(17/84 Pages) FREESCALE

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MPC875/MPC870 PowerQUICC™ Hardware Specifications, Rev. 4

Freescale Semiconductor

Bus Signal Timing

11 Bus Signal Timing

The maximum bus speed supported by the MPC875/MPC870 is 80 MHz. Higher-speed parts must be

operated in half-speed bus mode (for example, an MPC875/MPC870 used at 133 MHz must be configured

for a 66 MHz bus). Table 8 shows the frequency ranges for standard part frequencies in 1:1 bus mode, and

Table 9 shows the frequency ranges for standard part frequencies in 2:1 bus mode.

Table 10 provides the bus operation timing for the MPC875/MPC870 at 33, 40, 66, and 80 MHz.

The timing for the MPC875/MPC870 bus shown Table 10, 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 8. Frequency Ranges for Standard Part Frequencies (1:1 Bus Mode)

Part Frequency

66 MHz

80 MHz

Min

Max

Min

Max

Core frequency

66.67

Bus frequency

66.67

Table 9. Frequency Ranges for Standard Part Frequencies (2:1 Bus Mode)

Part Frequency

66 MHz

80 MHz

133 MHz

Min

Max

Min

Max

Min

Max

Core frequency

66.67

133

Bus frequency

33.33

Table 10. Bus Operation Timings

Num

Characteristic

33 MHz

40 MHz

66 MHz

80 MHz

Unit

Min

Max

Min

Max

Min

Max

Min

Max

Bus period (CLKOUT), see Table 8

———

————

—

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

B1b

CLKOUT frequency jitter peak-to-peak

—

B1c

Frequency jitter on EXTCLK

—

0.50

—

0.50

—

0.50

—

0.50

B1d

CLKOUT phase jitter peak-to-peak for

OSCLK

≥ 15 MHz

—4

—

—4

—

CLKOUT phase jitter peak-to-peak for

OSCLK < 15 MHz

—5

—

—5

—

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