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Altera_Forum
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16 years ago

LVDS ADC to DDR ram

I am trying to take data from an 8 channel ADC that happens to have an LVDS output. I used the ALTLVDS function to make this data into a readable memory mapped interface. I am not sure that is exac...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi

I am stuck on ALTLVDS Megafunction. I am tring to pass a HSTC Pin input (which is the clock from ADC connected at HSTC true LVDS pin) to the ALTLVDS as a reference to internal PLL of the megafunction. it genrates this error in fitter.

"Error: Can't place Left/Right or Top/Bottom PLL "LVDS:ins3|altlvds_rx:altlvds_rx_component|LVDS_lvds_rx:auto_generated|pll" -- I/O pin HSTCC_RX_p[0] (port type INCLK of the PLL) is assigned to a location which is not connected to port type INCLK of any PLL on the device"

What i have found out so far is that I need a dedicated pins for the reference of PLL. How do transfer the data coming from a TRUE LVDS pin to a dedicated pin? or is there some other way to bypass this?

Regards

Omar