TM Family Datasheet Page 17 of 77 July 2009 – Rev" />
參數(shù)資料
型號: PI7C9X20404SLCFDE
廠商: Pericom
文件頁數(shù): 9/77頁
文件大?。?/td> 0K
描述: IC PCIE PACKET SWITCH 128LQFP
標準包裝: 90
系列: SlimLine™
應(yīng)用: 封裝開關(guān),4 端口/4 線道
接口: PCI Express
封裝/外殼: 128-LQFP 裸露焊盤
供應(yīng)商設(shè)備封裝: 128-LQFP(14x14)
包裝: 托盤
安裝類型: 表面貼裝
PI7C9X20404SL
4Port-4Lane PCI Express Switch
SlimLine
TM Family
Datasheet
Page 17 of 77
July 2009 – Revision 1.2
Pericom Semiconductor
DTX [3:0]
ACTUAL CURRENT / NOMINAL CURRENT
0111
1.35
1000
0.60
1001
0.65
1010
0.70
1011
0.75
1100
0.80
1101
0.85
1110
0.90
1111
0.95
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 (ITX –IEQ) to non-de-
emphasized driver current (ITX) for different values of DEQ [3:0].
Table 5-3 De-emphasis Level versus DEQ [3:0]
DEQ [3:0]
(ITX –IEQ) / ITX
De-emphasis (dB)
0000
1.00
0.00
0001
0.96
-0.35
0010
0.92
-0.72
0011
0.88
-1.11
0100
0.84
-1.51
0101
0.80
-1.94
0110
0.76
-2.38
0111
0.72
-2.85
1000
0.68
-3.35
1001
0.64
-3.88
1010
0.60
-4.44
1011
0.56
-5.04
1100
0.52
-5.68
1101
0.48
-6.38
1110
0.44
-7.13
1111
0.40
-7.96
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.
Table 5-4 Rx Equalizer Settings (RXEQCTL)
RXEQCTL [1]
RXEQCTL [0]
Rx Eq Setting
Input Jitter
Channel Length
0
Max Rx Eq
> 0.25 UI
> 20" and two or more
connectors
0
1
Min Rx Eq
Between 0.1 UI
and 0.25 UI
Between 8'' and 20" and up to
two connectors
1
X
< 0.1 UI
8" or less, up to one connector
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