参数资料
型号: ORT8850L-3BM680C
厂商: Lattice Semiconductor Corporation
文件页数: 57/105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
55
Figure 31 shows the timing for sending TOH data from the FPGA logic to the Core. As in the earlier input example,
the constraints on the data are specied in terms of setup and hold times on the data at the interface relative to the
clock at the interface. In the case shown, launch and capture occur on different clock edges (rising edge in the
FPGA). Data is captured before the next data is launched, so there will be no hold margin problem. Launched data
also has nearly a full clock period to become stable at the capture latch, so setup margin should not be a problem
for the timing relationships assumed in the example. Actual timing analysis should be performed for each applica-
tion because of the wide range of possible skew values.
Figure 31. Half Cycle, TOH Input Conguration and Timing (-1 Speed Grade)
Q
+
D
-
Δt
Embedded
Core
FPGA
Logic
Secondary Clock
1.8 ns
ASB_IN_TOH_CLK
a. Configuration
b. Timing (ns)
FPGA_CLK
TOH_CLK
Note: xx = [AA, AB, ..., BD]
TOH_INxx
±3.0 ns skew
+2.0 ns assumed
TOH_CLK
0.0
4.7
9.4
Capture
14.1
FPGA_CLK
2.0
6.7
11.4
16.1
Launch
1.8
6.5
11.2
15.9
Hold
Data
Valid
ASB_IN_TOH_CLK
TOH_INxx
Requirements on
hold time = 1.8
setup time = 0.0
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