Compaq SMA200 user manual SmartCoreExpress Signal Groups, PCI-Express

DIGITAL-LOGIC AG SMA200 Manual V1.0

5.4.smartCoreExpress Signal Groups

5.4.1.PCI-Express

				On Module	Ext. Ter-	Max.		Matched
Signal	BUS	Type	Description	Termination	mination	Length	Ohm	Length
					Needed	in mm		in mm

PCIe_Tx [0-4] +/-

PCIe_Rx [0..4] +/-

PCIe_CLK[0..4] +/-

PCIe_REQ#[0..4]

PCIe

PCIe

PCIe

PCIe

Dif	Transmitter 2.5Gbit	100nF Series
Out	Connected to an Rx pin pair	Cap.
	of the device.
Dif	Receiver 2.5Gbit	-
In	Connected to a Tx pin pair
	of the device. The Tx output
	of the device needs an AC
	coupling capacitor.
Dif	Reference clock (100MHz)	-
Out	Connected to a Refclock pin
	pair of the device.
3.3V	A low signal at this input will	PU
In	enable the PCI-Clk-Output	integrated in
	of the corresponding PCI-	the CK540
	Express lane.

-

Series

Cap.

100nF As 0402

-

-

200100

200100

200100

200Static

0.2

0.2

0.2

-

If the signals are not used:

All these PCI-Express signals may be left open.

Remarks:
Pair to Pair spacing:	35mil = 0.9mm
BUS to BUS spacing:	20mil = 0.5mm

The AC coupling capacitors must be placed near the device for the Tx signals only. The maximum number of vias per signal is less than 4.

EMV/EMI filters:

Are not needed.

25