参数资料
型号: PI7C9X20404GPBNBE
厂商: Pericom
文件页数: 9/79页
文件大小: 0K
描述: IC PCIE PACKET SWITCH 148LFBGA
产品变化通告: Product Discontinuation Notice 22/Jan/2010
标准包装: 189
系列: GreenPacket™
应用: 封装开关,4 端口/4 线道
接口: PCI Express
封装/外壳: 148-LFBGA
供应商设备封装: 148-LFBGA(12x12)
包装: 托盘
安装类型: 表面贴装
PI7C9X20404GP
4Port-4Lane PCI Express Switch
GreenPacket
TM Family
Datasheet
Page 17 of 79
June 2009 – Revision 1.6
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” conform to the PCI Express 1.0a 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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