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AFS090 Datasheet(PDF) 48 Page - Microsemi Corporation

Part # AFS090
Description  Fusion Family of Mixed Signal FPGAs
PDF  334 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

AFS090 Datasheet(HTML) 48 Page - Microsemi Corporation

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Device Architecture
2- 32
R e visio n 2
The NGMUX macro is simplified to show the two clock options that have been selected by the
GLMUXCFG[1:0] bits. Figure 2-25 illustrates the NGMUX macro. During design, the two clock sources
are connected to CLK0 and CLK1 and are controlled by GLMUXSEL[1:0] to determine which signal is to
be passed through the MUX.
The sequence of switching between two clock sources (from CLK0 to CLK1) is as follows (Figure 2-26):
•
GLMUXSEL[1:0] transitions to initiate a switch.
•
GL drives one last complete CLK0 positive pulse (i.e., one rising edge followed by one falling
edge).
•
From that point, GL stays Low until the second rising edge of CLK1 occurs.
•
At the second CLK1 rising edge, GL will begin to continuously deliver the CLK1 signal.
•
Minimum tsw = 0.05 ns at 25°C (typical conditions)
For examples of NGMUX operation, refer to the Fusion FPGA Fabric User’s Guide.
Figure 2-25 • NGMUX Macro
Figure 2-26 • NGMUX Waveform
CLK0
CLK1
GL
GLMUXSEL[1:0]
CLK0
CLK1
GLMUXSEL[1:0]
GL
tSW



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