MPC8275VR datasheet(19/76 Pages) MOTOROLA

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MOTOROLA

MPC8280 PowerQUICC II™ Family Hardware Speciﬁcations

AC Electrical Characteristics

6.2

SIU AC Characteristics

NOTE: CLKIN Jitter and Duty Cycle

The CLKIN input to the MPC8280 should not exceed +/– 150 psec. This

represents total input jitter—the combination of short term (peak-to-peak)

and long term (cumulative). The duty cycle of CLKIN should not exceed

the ratio of 40:60.

NOTE: PCI AC Timing

The MPC8280 meets the timing requirements of PCI Speciﬁcation

Revision 2.2. Refer to Sections 7.2 and 7.3 and “Note: Tval (Output Hold)”

to determine if a speciﬁc clock conﬁguration is compliant.

Table 11 lists SIU input characteristics.

Table 11. AC Characteristics for SIU Inputs1

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.

Spec Number

Characteristic

Value (ns)

Setup

Hold

Setup

Hold

66 MHz

83 MHz 100 MHz 66 MHz

83 MHz 100 MHz

sp11

sp10 AACK/TA/TS/DBG/BG/BR

3.5

0.5

sp11a

sp10 ARTRY/ TEA

0.5

sp12

sp10 Data bus in normal mode

3.5

0.5

sp13

sp10 Data bus in ECC and PARITY modes

3.5

0.5

sp13a

sp10 Pipeline mode—

Data bus in ECC and PARITY modes

2.5

0.5

sp14

sp10 DP pins

3.5

0.5

sp14a

sp10 Pipeline mode—DP pins

—

2.5

—

0.5

sp15

sp10 All other pins

3.5

0.5

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