pi2eqx5804d Pericom Semiconductor Corporation, pi2eqx5804d Datasheet - Page 6

• Manufacturer Part Number: pi2eqx5804d
• Description: 5.0gbps 4-lane Pcie? 2.0 Redrivertm With Equalization & Emphasis
• Manufacturer: Pericom Semiconductor Corporation

Output Swing Control
Emphasis settings are determined by the state of the DEx_y input pins and configuration registers, as shown in the Output De-
emphasis table below. De-Emphasis is selected as the default power-on mode in following the PCI Express specification, but can be
changed to Pre-emphasis via reprogramming the Loopback and Emphasis Control register using the I
Output De-emphasis Adjustment
Input Level Detect
An input level detect and output squelch function is provided on each channel to eliminate re-transmission of input noise. A con-
tinuous signal level below the V
negative output signal are pulled to V
state.
Output Configuration
The PI2EQX5804D provides flexible output strength and emphasis controls to provide the optimum signal to pre-compensate for
losses across long trace or noisy environments so that the receiver gets a clean eye opening. Control of output configuration is
grouped for the A and B channels, so that each channel within the group has the same setting.
Output configuration is performed in two ways depending on the state of the MODE pin. When the device first powers up, the
Sx_[A:B], and Dx_[A:B] input pins are read into the appropriate control registers to set the power-on state. If the MODE pin is low,
reprogramming of these control registers via I
The Output Swing Control table shows available configuration settings for output level control, as specified using the Sx_y pins and
registers.
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0
0
1
1
0
0
0
0
1
1
1
1
S1_[A:B]
D2_[A:B]
0
0
1
1
0
0
1
1
D1_[A:B]
0
1
0
1
S0_[A:B]
th
- threshold causes the output driver to go to a high-impredance state, so that both the positive and
DD
0
1
0
1
0
1
0
1
D0_[A:B]
by the internal pull-up resistors. This feature supports the L0s PCI Express Electrical Idle
2
5.0Gbps 4-Lane PCIe® 2.0 ReDriver™ with Equalization & Emphasis
C is allowed.
1V
0.5V
0.7V
0.9V
Swing (Diff. VPP)
De-emphasis
0dB
-2.5dB
-3.5dB
-4.5dB
-5.5dB
-6.5dB
-7.5dB
-8.5dB
6
10-0170
www.pericom.com
2
C interface.
PI2EQX5804D
P-0.1
05/28/10