参数资料
型号: M-ORT82G52BM680-DB
厂商: LATTICE SEMICONDUCTOR CORP
元件分类: FPGA
英文描述: FPGA, 1296 CLBS, 333000 GATES, PBGA680
封装: PLASTIC, FBGA-680
文件页数: 30/94页
文件大小: 2104K
代理商: M-ORT82G52BM680-DB
Lattice Semiconductor
ORCA ORT82G5 Data Sheet
36
Table 11. TCK78[A:B] Source Selection
Recommended Transmit Clock Distribution
As an example of the recommended clock distribution approach, TSYS_CLK_A[A:D] can be sourced by TCK78A
as shown in Figure 16 if the transmit line rate are common for all 4 channels in a quad. Similar clocking would be
used for Quad B.
Figure 16. Transmit Clocking for a Single Quad (Similar Connections Would Be Used for Quad B)
If the transmit line rate is mixed between half and full rate among the channels, then the scheme shown in
Figure 17 can be used. The gure shows TSYS_CLK_AA and TSYS_CLK_AB being sourced by TCK78A and
TSYS_CLK_AC and TSYS_CLK_AD being sourced by TCK78A/2 (the division is done in FPGA logic). Similar
clocking would be used for Quad B.
TCKSEL0
TCKSEL1
Clock Source
0
Channel A
1
0
Channel B
0
1
Channel C
1
Channel C
Common Logic, Quad A
Channel AA
Channel AB
Channel AD
Channel AC
REFCLK[P:N]_A
2
156.25 MHz
TCK78A
TSYS_CLK_AA
TSYS_CLK_AC
TSYS_CLK_AB
TSYS_CLK_AD
FPGA
Logic
All Clocks at
78.125 MHz
Four Channels of
3.125 Gbits/s
Outgoing Serial Data
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