MPC8270VR View Datasheet(PDF) - Freescale Semiconductor
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MPC8270VR Datasheet PDF : 83 Pages
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AC Electrical Characteristics
6 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.
Table 8. Output Buffer Impedances1
Output Buffers
Typical Impedance (Ω)
60x bus
45 or 272
Local bus
Memory controller
45
45 or 272
Parallel I/O
45
PCI
27
1 These are typical values at 65° C. Impedance may vary by ±25% with process and
temperature.
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.
6.1 CPM AC Characteristics
This table lists CPM output characteristics.
Table 9. AC Characteristics for CPM Outputs1
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)
6
5.5
5.5
0.5
0.5
0.5
sp36b sp37b FCC outputs—external clock (NMSI)
8
8
8
2
2
2
sp38a sp39a SCC/SMC/SPI/I2C outputs—internal
10
10
10
0
0
0
clock (NMSI)
sp38b sp39b SCC/SMC/SPI/I2C outputs—external
8
8
8
2
2
2
clock (NMSI)
sp40 sp41 TDM outputs/SI
11
11
11
2.5
2.5
2.5
sp42 sp43 TIMER/IDMA outputs
11
11
11
0.5
0.5
0.5
sp42a sp43a PIO outputs
11
11
11
0.5
0.5
0.5
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.
MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2
16
Freescale Semiconductor
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