MPC8308CVMADDA datasheet(39/95 Pages) NXP

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MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 4

Freescale Semiconductor

PCI Express

AC peak common mode

input voltage

VRX-CM-ACp

VPEACPCMRX = |VRXD+ + VRXD-|/2 -

VRX-CM-DC

VRX-CM-DC = DC(avg) of |VRX-D+ +

VRX-D-|/2

——

150

Differential return loss

RLRX-DIFF

Measured over 50 MHz to 1.25 GHz

with the D+ and D- lines biased at +300

mV and -300 mV, respectively.

—

Common mode return loss

RLRX-CM

Measured over 50 MHz to 1.25 GHz

with the D+ and D- lines biased at 0 V.

6—

—

DC differential input

impedance

ZRX-DIFF-DC

RX DC differential mode impedance.

100

120



DC Input Impedance

ZRX-DC

Required RX D+ as well as D- DC

Impedance (50 ± 20% tolerance).



2, 5

Powered down DC input

impedance

ZRX-HIGH-IMP-DC

Required RX D+ as well as D- DC

Impedance when the Receiver

terminations do not have power.

200 k

—



Electrical idle detect

threshold

VRX-IDLE-DET-DIFFp-p VPEEIDT = 2*|VRX-D+ -VRX-D-|

Measured at the package pins of the

Receiver

—

175

—

Unexpected Electrical Idle

Enter Detect Threshold

Integration Time

TRX-IDLE-DET-DIFF-

ENTERTIME

An unexpected Electrical Idle

(Vrx-diffp-p < Vrx-idle-det-diffp-p) must

be recognized no longer than

Trx-idle-det-diff-entertime to signal an

unexpected idle condition.

——

—

Total Skew

LRX-SKEW

Skew across all lanes on a Link. This

includes variation in the length of SKP

ordered set (for example, COM and one

to five SKP Symbols) at the RX as well

as any delay differences arising from

the interconnect itself.

—

Table 35. Differential Receiver (RX) Input Specifications (continued)

Parameter

Symbol

Comments

Min

Typical

Max

Units Note

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