MPC875EC datasheet(16/84 Pages) FREESCALE

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MPC875/MPC870 Hardware Specifications, Rev. 3.0

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Freescale Semiconductor

Bus Signal Timing

Table 10 provides the bus operation timing for the MPC875/870 at 33, 40, 66, and 80 MHz.

The timing for the MPC875/870 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 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

CLKOUT phase jitter peak-to-peak

for OSCLK < 15 MHz

—5

CLKOUT pulse width low

(MIN = 0.4

× B1, MAX = 0.6 × B1)

12.1

18.2

10.0

15.0

6.1

9.1

5.0

7.5

CLKOUT pulse width high

(MIN = 0.4

× B1, MAX = 0.6 × B1)

12.1

18.2

10.0

15.0

6.1

9.1

5.0

7.5

CLKOUT rise time

—

4.00

—

4.00

—

4.00

—

4.00

CLKOUT fall time

—

4.00

—

4.00

—

4.00

—

4.00

CLKOUT to A(0:31), BADDR(28:30),

RD/WR, BURST, D(0:31) output hold

(MIN = 0.25

× B1)

7.60

—

6.30

—

3.80

—

3.13

—

B7a

CLKOUT to TSIZ(0:1), REG, RSV, BDIP,

PTR output hold (MIN = 0.25

× B1)

7.60

—

6.30

—

3.80

—

3.13

—

B7b

CLKOUT to BR, BG, FRZ, VFLS(0:1),

VF(0:2) IWP(0:2), LWP(0:1), STS output

hold (MIN = 0.25

× B1)

7.60

—

6.30

—

3.80

—

3.13

—

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