Special SQ1 Bias Commands

Address Card has a special multiplexing mode, enbl_mux = 3, when selected SQ1 Bias lines are turned on for an adjustable duration in the begining of a row visit, before the target SQ1 Bias for that row is turned on. The following parameters need to be set for this mode:

bias_start

heater_bias

Upto 41 values that specify the magnitude of the SQ1-bias heating pulse in DAC units (0 to 16,383) during the initial heater_bias_len period of each row visit.

heater_bias_len

a single value that specifies the length of the SQ1-bias heating pulses at the beginning of every new row period. heater_bias_len is measured from the first clock cycle of each new row dwell time. However, it takes 4 clock cycles to apply all the heater

biases. This means the heater biases are applied by clock cycle #5.

Here is a timing diagram of SQ1 Bias when enbl_mux = 3