pi2eqx5804nje Pericom Semiconductor Corporation, pi2eqx5804nje Datasheet - Page 7

• Manufacturer Part Number: pi2eqx5804nje
• Description: 5.0gbps 4-lane Pcie Gen2 Redriver
• Manufacturer: Pericom Semiconductor Corporation

Table 4 - I/O Operation Control
Receiver Detect is enabled by the RXD_A, or RXD_B pins, or alternatively via I2C programming. When RXD_A or
RXD_B is set to low, then the Receiver Detect operation for that group of channel is disabled, and those channels go
directly to 50-Ohm input termination to ground and 50-Ohm output termination to VDD (for a valid differential channel
input level) or to 2K-Ohm (if the signal level is less than the threshold level).
The RES_A#, and RES_B# inputs are used to reset the receiver detect state machine to its initial state. RES_A# and
RES_B# control the received detect function for the A and B group of channels respectively. The start of the receiver
detect cycle starts when RES_A# or RES_B# transitions from low to high.
When a Receiver Detect cycle is begins the differential channel pins are enabled with a 2K-Ohm pullup to Vdd. A 50-
Ohm Receiver termination will change the pin level. This pin level is evaluated after a fi xed time-out, and the channel
is then set into the proper operating state. The output signals RX50_A and RX50_B represent the receiver detect result
for their specifi c channels.
The I/O Operation table summaries the relationships and operation of receiver detect and other signals involved with
I/O control.
PD# PRSNT2# RXD_x RES_x#
0
1
1
1
1
1
1
1
1
07-0260
Control Inputs
X
1
0
0
0
0
0
0
0
X
X
0
0
0
1
1
1
1
X
X
0
1
1
0
1
1
1
RX50
X
X
X
X
X
X
0
1
1
Detection
States
SIG_x
X
X
X
X
X
0
1
0
1
Input Termination Output Termination
50-Ohm pull-
50-Ohm pull-
50-Ohm pull-
50-Ohm pull-
7
down
down
down
down
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
5.0Gbps 4-Lane PCI Express Gen2 Re-Driver with
Data Channel I/O
2K-Ohm pull-up
2K-Ohm pull-up
2K-Ohm pull-up
2K-Ohm pull-up
2K-Ohm pull-up
50-Ohm pull-up
50-Ohm pull-up
Hi-Z
Hi-Z
Equalization & Emphasis
Full IC power down, all chan-
ing. Receiver detect disabled.
enabled, no receiver detected.
Channel inactive, output pulls
pulls to Vdd. Receiver detect
pulls to Vdd. Receiver detect
ing. Receiver detect enabled,
Channel enabled, valid input
abled, receiver detected. No
signal detected, output driv-
signal detected, output driv-
Channel disabled. Receiver
to Vdd. Receiver detect en-
signal, output pulls to Vdd.
Channel active, valid input
Channel enabled, no input
Channel disabled, output
Channel disabled, output
Receiver detect disabled
PRSNT2#), all channels
No receiver (defi ned by
load detected.
nels disabled
detect reset.
input signal
disabled
PS8926A
Mode
reset
PI2EQX5804
11/19/07