AFS090 datasheet(48/334 Pages) MICROSEMI

No. de pieza	AFS090

Descripción Electrónicos	Fusion Family of Mixed Signal FPGAs

PDF	334 Pages

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Fabricante Electrónico	MICROSEMI [Microsemi Corporation]

Página de inicio	http://www.microsemi.com

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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

GLMUXSEL[1:0]

CLK0

CLK1

GLMUXSEL[1:0]

tSW

AFS090 Datasheet(PDF) 48 Page - Microsemi Corporation