MPC8270VR datasheet(16/83 Pages) FREESCALE

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MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2

Freescale Semiconductor

AC Electrical Characteristics

The following sections include illustrations and tables of clock diagrams, signals, and CPM outputs and

inputs for 66.67/83.33/100 MHz devices. Note that AC timings are based on a 50-pf load for MAX Delay

and 10-pf load for MIN delay. Typical output buffer impedances are shown in this table.

6.1

CPM AC Characteristics

This table lists CPM output characteristics.

Table 8. Output Buffer Impedances1

1 These are typical values at 65° C. Impedance may vary by ±25% with process and

temperature.

Output Buffers

Typical Impedance (

Ω)

60x bus

45 or 272

2 On silicon revision 0.0 (mask #: 0K49M), selectable impedance is not available.

Impedance is set at 45

Ω.

On all other revisions, impedance value is selected through the SIUMCR[20,21]. See

the SoC reference manual.

Local bus

Memory controller

45 or 272

Parallel I/O

PCI

Table 9. AC Characteristics for CPM Outputs1

1 Output specifications are measured from the 50% level of the rising edge of CLKIN to the 50% level of the signal. Timings are

measured at the pin.

Spec Number

Characteristic

Value (ns)

Max

Min

Maximum Delay

Minimum Delay

66 MHz

83 MHz

100 MHz

66 MHz

83 MHz

100 MHz

sp36a

sp37a FCC outputs—internal clock (NMSI)

5.5

0.5

sp36b

sp37b FCC outputs—external clock (NMSI)

sp38a

sp39a SCC/SMC/SPI/I2C outputs—internal

clock (NMSI)

sp38b

sp39b SCC/SMC/SPI/I2C outputs—external

clock (NMSI)

888

222

sp40

sp41

TDM outputs/SI

2.5

sp42

sp43

TIMER/IDMA outputs

0.5

sp42a

sp43a PIO outputs

0.5

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