参数资料
型号: IP-POSPHY4
厂商: Altera
文件页数: 120/144页
文件大小: 0K
描述: IP POS-PHY L4
标准包装: 1
系列: *
类型: MegaCore
功能: POS-PHY 4 级接口,链路层/物理层
许可证: 初始许可证
C–2
Appendix C: Optimum Frequency for rxsys_clk
The required frequency from restriction (b) is:
Status Frame Length = 3
rxsys_clk frequency ? 100 × (3+1) /3 = 100 × 4/3 = 133.34 MHz
For this example, rxsys_clk ? 133.34 MHz
If you increase the LVDS data rate to 820 Mbps ( rdint_clk = rsclk = 102.5 MHz), the
new minimum required rxsys_clk frequency from restriction (a) is:
(4/3.125) × 102.5 = 131.2 MHz
and from restriction (b) is:
102.5 × 4/3 = 136.667 MHz
If you do not want to increase the rxsys_clk frequency, you can increase the status
frame length. By setting the calendar multiple to 2, the required frequency from
restriction (b) is
Status frame length = 4
rxsys_clk frequency ? 102.5 × 5/4 = 128.125 MHz
By changing the calendar multiple to 2, the required minimum rxsys_clk frequency
is 131.2 MHz (from restriction (a)).
Figure C–1. Minimum Frequency Ratio versus Packet Size
Ratio
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0. 8
20
30
40
50
60
70
8 0
90
100 110
Packet Size
(Bytes)
MegaCore W idth = 64
MegaCore W idth = 12 8
POS-PHY Level 4 MegaCore Function User Guide
May 2013 Altera Corporation
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