12th Generation Intel® Core™ Processors

Datasheet, Volume 1 of 2

ID 655258
Date 08/08/2022
Document Table of Contents

PCI Express* Graphics (PEG) Group DC Specifications

PCI Express* Graphics (PEG) Group DC Specifications

Symbol

Parameter

Min

Typ

Max

Units

Notes1

ZTX-DIFF-DC

DC Differential Tx Impedance

80

100

120

Ω

1, 5

ZRX-DC

DC Common Mode Rx Impedance

40

50

60

Ω

1, 4

ZRX-DIFF-DC

DC Differential Rx Impedance

80

120

Ω

1

PEG_​RCOMP

resistance compensation

24.75

25

25.25

Ω

2, 3

Notes:
  1. Refer to the PCI Express Base Specification for more details.
  2. Low impedance defined during signaling. Parameter is captured for 5.0 GHz by RLTX-DIFF.
  3. PEG_​RCOMP resistance should be provided on the system board with 1% resistors. COMP resistors are to VCCIO_​OUT. PEG_​RCOMP- Intel allows using 24.9 Ω 1% resistors.
  4. DC impedance limits are needed to ensure Receiver detect.
  5. The Rx DC Common Mode Impedance should be present when the Receiver terminations are first enabled to ensure that the Receiver Detect occurs properly. Compensation of this  impedance can start immediately and the 15 Rx Common Mode Impedance (constrained by RLRX-CM to 50 Ω ±20%) should be within the specified range by the time Detect is entered.