MPC8548ECPXATHC datasheet(78/151 Pages) FREESCALE

78 / 151 page

MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

Freescale Semiconductor

PCI Express

VRX-CM-ACp

AC peak

common mode

input voltage

——

150

VRX-CM-ACp = |VRXD+ – VRXD-|/2 + VRX-CM-DC

VRX-CM-DC = DC(avg) of |VRX-D+ + VRX-D–| 2.

See Note 2.

RLRX-DIFF

Differential

return loss

—

Measured over 50 MHz to 1.25 GHz with the D+

and D– lines biased at +300 mV and –300 mV,

respectively. See Note 4.

RLRX-CM

Common mode

return loss

—

Measured over 50 MHz to 1.25 GHz with the D+

and D– lines biased at 0 V. See Note 4.

ZRX-DIFF-DC

DC differential

input impedance

100

120



RX DC differential mode impedance. See Note 5.

ZRX-DC

DC input

impedance



Required RX D+ as well as D– DC impedance

(50 ± 20% tolerance). See Notes 2 and 5.

ZRX-HIGH-IMP-DC

Powered down

DC input

impedance

200 k

—



Required RX D+ as well as D– DC impedance

when the receiver terminations do not have

power. See Note 6.

VRX-IDLE-DET-DIFFp-p

Electrical idle

detect threshold

—

175

VRX-IDLE-DET-DIFFp-p = 2 × |VRX-D+ –VRX-D–|.

Measured at the package pins of the receiver

TRX-IDLE-DET-DIFF-

ENTERTIME

Unexpected

electrical idle

enter detect

threshold

integration time

—

An unexpected electrical idle (VRX-DIFFp-p <

VRX-IDLE-DET-DIFFp-p) must be recognized no

longer than TRX-IDLE-DET-DIFF-ENTERING to signal

an unexpected idle condition.

Table 57. Differential Receiver (RX) Input Specifications (continued)

Symbol

Parameter

Min

Nom

Max

Unit

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