Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
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Using DCLK as general IO

Altera_Forum
Honored Contributor II
‎01-22-2008 03:32 PM
978 Views

Hi, 

 

I am using Cyclone III and possibly using remote update function. 

 

In AP mode, the DCLK is the flash clk output. I am wondering If it can be used as an general IO when configuration completed? 

 

Thanks, 

 

Frank
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Altera_Forum
Honored Contributor II
‎01-22-2008 05:01 PM
246 Views

Hi Frank, 

 

Yes this can be used as regular I/O but there are certain conditions(see below) 

 

You must navigate to  

 

Settings -> Device and Pin Options -> Dual -Purpose Pins 

 

 

Description 

Specifies how the DCLK pin should be used when the device is operating in user mode after configuration is complete. Depending on the current device and configuration scheme, the DCLK pin can be reserved as a regular I/O pin, as a dedicated programming pin, or compiler configured. If this pin is reserved as a regular I/O pin, the DCLK pin can be used as an ordinary output pin after configuration. If the DCLK pin is only used to interface with external memory for configuration, the DCLK pin should be reserved as compiler configured. 

 

Regards
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