参数资料
型号: ORT8850L-3BM680C
厂商: Lattice Semiconductor Corporation
文件页数: 56/105页
文件大小: 0K
描述: IC FPSC TRANSCEIVER 8CH 680-BGA
产品变化通告: Product Discontinuation 01/Aug/2011
标准包装: 24
系列: *
Lattice Semiconductor
ORCA ORT8850 Data Sheet
54
The next two examples show timing for serial TOH data input and output. For these cases, the clock is generated in
the FPGA logic and the discussion accounts for the skew between the clock signal at the FPGA latch and at the
FPGA/Core interface. The clock is routed over a secondary clock path and the skew can vary by ± 3 ns. A value of
+ 2 ns was assumed in the discussions.
Figure 30 shows the timing for sending serial TOH data from the Core to the FPGA logic with data being launched
and latched on the same (rising) clock edge. As in the previous examples, setup and hold time constraints for the
data versus the reference clock at the capturing latch must be met. Data is not captured before the next data is
launched, so there might be a hold time margin problem. Launched data has nearly a full clock period to become
stable at the capture latch and the maximum propagation delay is only 0.2 ns so setup margin should not be a
problem for the timing relationships assumed. Actual timing analysis should be performed for each application
because of the wide range of possible skew values.
Figure 30. Full Cycle, TOH Output Conguration and Timing (-1 Speed Grade)
D
+
Q
+
Δt
Embedded
Core
FPGA
Logic
Secondary Clock
0.4 ns
ASB_TOH_CLK
a. Configuration
b. Timing (ns)
FPGA_CLK
TOH_CLK
±3.0 ns skew
+2.0 ns assumed
TOH_CLK
0.0
4.7
9.4
14.1
18.8
ASB_TOH_CLK
0.4
5.1
8.8
14.5
19.2
Hold
Launch
FPGA_CLK
2.0
6.7
11.4
Capture
16.1
Data Valid
TOH_OUTxx
tprop_max = 2.0
tprop_min = - 0.5
Note: xx - [AA, AB, ..., BD]
TOH_OUTxx
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