afs600 Actel Corporation, afs600 Datasheet - Page 44

• Manufacturer Part Number: afs600
• Description: Actel Fusion Programmable System Chips Mixed-signal Family With Optional Arm Support
• Manufacturer: Actel Corporation

The NGMUX macro is simplified to show the two clock options that have been selected by the GLMUXCFG[1:0] bits.
Figure 2-25
are controlled by GLMUXSEL[1:0] to determine which signal is to be passed through the MUX.
Figure 2-25 • NGMUX Macro
The sequence of switching between two clock sources (from CLK0 to CLK1) is as follows
For examples of NGMUX operation, refer to the
Figure 2-26 • NGMUX Waveform
2 -3 0
Actel Fusion Programmable System Chips
• 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 t
illustrates the NGMUX macro. During design, the two clock sources are connected to CLK0 and CLK1 and
sw
= 0.05 ns at 25°C (typical conditions)
GLMUXSEL[1:0]
CLK0
CLK1
CLK0
CLK1
GL
Peripherals User’s
A d v a n c e d v 1 . 4
GLMUXSEL[1:0]
t
SW
Guide.
GL
(Figure
2-26):