psoctools | mappings in tabular format
HC (Horizontal Channel)
hc connects the HV or HS/VS to peripherals/gpios or a UDB block: PLD0 input, PLD0 output, PLD1 output, PLD1 input, datapath, status, control, and clocking/reset.
col row direction bit reg bit#
d means forw/back
n means the hc switch is below a UDB output