Help: ICE_CARDS_D2A
Digital to Analog Converter Module
This module converts 12-bit TTL data to analog signal voltages at up to 125MHz.
There are four clock sources, three located on the motherboard, and are
selectable via software control. The default clock is an external source
connected to the motherboard SMB connector, usually a 1Vpp sine wave.
The internal clock (MUXCLK=I) is the on-board 40MHz crystal divided by an
integer from 1 to 65535. The alternate clock (MUXCLK=C) is the socketed
crystal X2 on the motherboard. The fourth source is a 125MHz crystal on the
module. This is used to support high bandwidth test signals using a pattern
programmed into the FPGA on the module. See PICFUNC for more details.