10.2.9.1 ProASICPLUS® PLL I/O Description

The following table lists the I/O description of a ProASICPLUS PLL.

Table 10-155. I/O Description
Name	Size	Type	Required/Optional	Function
GLA	1	Output	Optional	Secondary clock output
GLB	1	Output	Required	Primary clock output
LOCK	1	Output	Required	PLL Lock
SDOUT	1	Output	Required	Output of serial interface shift register
CLK	1	Input	Required	Input clock for primary clock
CLKA	1	Input	Optional	Input clock for secondary clock. Valid only in Bypass Mode
EXTFB	1	Input	Optional	External Feedback
SCLK	1	Input	Optional	Shift Clock (Only Dynamic Mode)
SSHIFT	1	Input	Optional	Serial Shift enable (Only Dynamic Mode)
SDIN	1	Input	Optional	Serial Data in for PLL configuration bits (Only Dynamic Mode)
SUPDATE	1	Input	Optional	Serial Update (Only Dynamic Mode)
MODE	1	Output	Optional	Dynamic or Static mode indicator