mcf54455 Freescale Semiconductor, Inc, mcf54455 Datasheet - Page 29

• Manufacturer Part Number: mcf54455
• Description: 32-bit Microprocessor With Usb On-the-go, Ethernet, Pci, Ddr2/ddr Controller And Encryption
• Manufacturer: Freescale Semiconductor, Inc

5.9.1
Figure 14
specification limits shown must be followed. Good transmission line design practices should be observed to guarantee the
specification limits.
Freescale Semiconductor
1
2
3
Num
The PCI bus operates at the CLKIN frequency. All timings are relative to the input clock, CLKIN.
All PCI signals are bused signals except for PCI_GNT[3:0] and PCI_REQ[3:0]. These signals are defined as point-to-point
signals by the PCI Specification.
The 66-MHz parameters are only guaranteed when the 66-MHz PCI pad slew rates are selected. Likewise, the 33-MHz
parameters are only guaranteed when the 33-MHz PCI pad slew rates are selected.
P6
P7
shows the specification limits for overshoot and undershoot for PCI I/O. To guarantee long term reliability, the
PCI_REQ[3:0]/PCI_GNT[3:0] — output valid
All PCI signals — output hold
Overshoot and Undershoot
Setup/Hold
Valid/Hold
Output
CLKIN
Input
MCF5445x ColdFire
Table 14. PCI Timing Specifications
Characteristic
Figure 13. PCI Timing
P5
P6
®
P1
Microprocessor Data Sheet, Rev. 0
P2
P3
Output Valid
Input Valid
P7
P4
1
,
2
(continued)
Min
2.0
—
33 MHz
Max
12.0
3
—
Electrical Characteristics
Min
1.0
—
66 MHz
Max
6.0
3
—
Unit
ns
ns
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