The HV Control is somewhat more complicated and uses four registers (8 through 11). Register 8 is the HV CSR and is divided into three sections - bits 0 to 7 control and monitor Supply A, bits 16 to 23 control and monitor Supply B (if it exists for a particular crate), and bit 31 is an overall Read Only Error Flag. The eight bits for Supply A are arranged as follows:
The other HV registers set or readback the analog values for voltage and current and are somewhat simpler as can be seen below:
