Synchronized TTL Output

Hello,

     I'm looking for a PXIe or PCIe card that can provide at least 8 TTL digital outputs. Any 4 of these TTL digital outputs will need to be synchronized in an arbitrary/programmable way (i.e., separated by specified delays). Need said delays to be programmable and accurate to within +/- 100nSec.  Anyone have an idea or a recommendation?

Thanks