PI2EQX5804CNJE Datasheet, PDF (8/23 Pages) Pericom Semiconductor Corporation – 5.0Gbps 4-Lane PCIe® 2.0 ReDriver™ with Equalization & Emphasis

PI2EQX5804C
5.0Gbps 4-Lane PCIe® 2.0 ReDriver™ with
Equalization & Emphasis
Loopback Operation
Each lane of the PI2EQX5804C provides a loopback mode for test purposes which is controlled by a strapping
pin and I²C register bit. The LB# pin controls all lanes together. When this pin is high normal data mode is en-
abled. When LB# is low the loopback mode is enabled. The figure below diagrams this operation. Loopback
is not intended to be dynamically switched, and the normal system application is to initialize to one configura-
tion or the other.
The Loopback mode can also support mux/demux operation. Using I²C configuration, unused inputs and out-
puts can be disabled to minimize power and unnecessary noise.
A0
A0
B0
B0
Normal Operation
LB#=1
A0
A0
B0
B0
Loopback Mode
LB#=0
A0
A0
B0
B0
A0
A0
B0
B0
Mux Function
ODIS_AO = 1
Solid: LB_A0B0#=1
Dashed: LB_A0B0#=0
Demux Function
INDIS_BO = 1
Solid: LB=1
Dashed: LB=0
Loopback Modes
09-0001
8
PS8926B
06/08/09