How to configure the trigger line in PXIE 8820

I am using PXIE-1073 chassis with PXIe 6535 digital i/o device and with PXIe
8820 embedded controller.I want to acquire 12 bits digital data through NI
CB-2162 single ended i/o accessory.For this purpose i want to use the trigger
input of PXIe 8820 embedded controller.How can i use this trigger line to
acquire the inputs.The triggering clock frequency will be approximately 156
kHz.Please give me the details.Also how can i use the internal trigger lines
(trig0.......trig7) to acquire the data.