MPC8275CZQI データシートの表示（PDF） - Freescale Semiconductor

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MPC8275CZQI

PowerQUICC II Family Hardware Specifications

Freescale Semiconductor 

AC Electrical Characteristics

This table lists CPM input characteristics.

NOTE: Rise/Fall Time on CPM Input Pins

It is recommended that the rise/fall time on CPM input pins should not

exceed 5 ns. This should be enforced especially on clock signals. Rise time

refers to signal transitions from 10% to 90% of VCC; fall time refers to

transitions from 90% to 10% of VCC.

Table 10. AC Characteristics for CPM Inputs1

Spec Number

Value (ns)

Setup Hold

Characteristic

Setup

Hold

66 MHz 83 MHz 100 MHz 66 MHz 83 MHz 100 MHz

sp16a sp17a FCC inputs—internal clock (NMSI)

6

6

6

0

0

0

sp16b sp17b FCC inputs—external clock (NMSI)

2.5

2.5

2.5

2

2

2

sp18a sp19a SCC/SMC/SPI/I2C inputs—internal clock

6

6

6

0

0

0

(NMSI)

sp18b sp19b SCC/SMC/SPI/I2C inputs—external clock

4

4

4

2

2

2

(NMSI)

sp20 sp21 TDM inputs/SI

5

5

5

2.5

2.5

2.5

sp22 sp23 PIO/TIMER/IDMA inputs

8

8

8

0.5

0.5

0.5

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

measured at the pin.

NOTE

Although the specifications generally reference the rising edge of the clock,

the following AC timing diagrams also apply when the falling edge is the

active edge.

This figure shows the FCC internal clock.

BRG_OUT

sp16a

FCC input signals

sp17a

FCC output signals

Note: When GFMR[TCI] = 0

sp36a/sp37a

FCC output signals

Note: When GFMR.[TCI] = 1

Figure 3. FCC Internal Clock Diagram

sp36a/sp37a

MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2

Freescale Semiconductor

17

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