MPC8548ECPXATHC datasheet(63/151 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

Freescale Semiconductor

PCI/PCI-X

This table provides the PCI-X AC timing specifications at 133 MHz. Note that the maximum PCI-X

frequency in synchronous mode is 110 MHz.

HRESET to PCI-X initialization pattern hold time

tPCRHIX

050

6, 11

Notes:

1. See the timing measurement conditions in the PCI-X 1.0a Specification.

2. Minimum times are measured at the package pin (not the test point). Maximum times are measured with the test point and

load circuit.

3. Setup time for point-to-point signals applies to REQ and GNT only. All other signals are bused.

4. For purposes of active/float timing measurements, the Hi-Z or off state is defined to be when the total current delivered

through the component pin is less than or equal to the leakage current specification.

5. Setup time applies only when the device is not driving the pin. Devices cannot drive and receive signals at the same time.

6. Maximum value is also limited by delay to the first transaction (time for HRESET high to first configuration access, tPCRHFV).

The PCI-X initialization pattern control signals after the rising edge of HRESET must be negated no later than two clocks

before the first FRAME and must be floated no later than one clock before FRAME is asserted.

7. A PCI-X device is permitted to have the minimum values shown for tPCKHOV and tCYC only in PCI-X mode. In conventional

mode, the device must meet the requirements specified in PCI 2.2 for the appropriate clock frequency.

8. Device must meet this specification independent of how many outputs switch simultaneously.

9. The timing parameter tPCRHFV is a minimum of 10 clocks rather than the minimum of 5 clocks in the PCI-X 1.0a Specification.

10.Guaranteed by characterization.

11.Guaranteed by design.

Table 54. PCI-X AC Timing Specifications at 133 MHz

Parameter

Symbol

Min

Max

Unit

Notes

SYSCLK to signal valid delay

tPCKHOV

—

3.8

1, 2, 3, 7, 8

Output hold from SYSCLK

tPCKHOX

0.7

—

1, 11

SYSCLK to output high impedance

tPCKHOZ

—

1, 4, 8, 12

Input setup time to SYSCLK

tPCIVKH

1.2

—

3, 5, 9, 11

Input hold time from SYSCLK

tPCIXKH

0.5

—

REQ64 to HRESET setup time

tPCRVRH

—

clocks

HRESET to REQ64 hold time

tPCRHRX

050

HRESET high to first FRAME assertion

tPCRHFV

—

clocks

10, 12

PCI-X initialization pattern to HRESET setup time

tPCIVRH

—

clocks

Table 53. PCI-X AC Timing Specifications at 66 MHz (continued)

Parameter

Symbol

Min

Max

Unit

Notes

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