PI7C9X20404SLCFDE Pericom Semiconductor, PI7C9X20404SLCFDE Datasheet - Page 17

• Manufacturer Part Number: PI7C9X20404SLCFDE
• Description: IC PCIE PACKET SWITCH 128LQFP
• Manufacturer: Pericom Semiconductor
• Series: SlimLine™r

Specifications of PI7C9X20404SLCFDE

• Applications: Data Transport
• Interface: Advanced Configuration Power Interface (ACPI)
• Package / Case: 128-LQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -

The equalization function of transmitting channels can optimize the driver current for different back-plane lengths
and materials. The table shown below lists the combinations of de-emphasized driver current (I
emphasized driver current (I
By default, the DEQ is set to “1000” to conform to the PCI Express specification, which calls for a de-emphasis
level of between –3 dB and –4 dB.
In order to improve the data stream integrity across the channels, the receiver of each port of the Switch includes a
reception equalizer to mitigate the effects of ISI. The reception equalizer is implemented as a selectable high-pass
filter at the input node, and it is capable of removing as much as 0.4UI of ISI related jitter. The following table
shows a simple guideline for selecting the appropriate value to adapt with different lengths or connector numbers in
various applications.
July 2009 – Revision 1.2
Pericom Semiconductor
Table 5-3 De-emphasis Level versus DEQ [3:0]
Table 5-4 Rx Equalizer Settings (RXEQCTL)
RXEQCTL [1]
DEQ [3:0]
DTX [3:0]
0111
1000
1001
1010
1011
1100
1101
1110
1111
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0
0
1
TX
RXEQCTL [0]
) for different values of DEQ [3:0].
(I
TX
ACTUAL CURRENT / NOMINAL CURRENT
X
0
1
–I
1.00
0.96
0.92
0.88
0.84
0.80
0.76
0.72
0.68
0.64
0.60
0.56
0.52
0.48
0.44
0.40
EQ
) / I
TX
Rx Eq Setting
Max Rx Eq
Min Rx Eq
Page 17 of 77
1.35
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
De-emphasis (dB)
> 0.25 UI
Between 0.1 UI
and 0.25 UI
< 0.1 UI
-0.35
-0.72
-1.11
-1.51
-1.94
-2.38
-2.85
-3.35
-3.88
-4.44
-5.04
-5.68
-6.38
-7.13
-7.96
0.00
Input Jitter
4Port-4Lane PCI Express® Switch
> 20" and two or more
connectors
Between 8'' and 20" and up to
two connectors
8" or less, up to one connector
Channel Length
SlimLine
TX
PI7C9X20404SL
–I
EQ
) to non-de-
Datasheet
TM
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