Difference between revisions of "Special SQ1 Bias Commands"
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| − | Address Card has a special multiplexing mode, enbl_mux = 3, | + | Address Card has a special multiplexing mode, '''enbl_mux''' = 3. In this mode, 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 DACS are updated with '''heater_bias''' values during the first '''heater_bias_len''' clock cycles, and with '''on_bias''' values for the remaining clock cycles of a row visit. The following parameters need to be set for this mode: |
;heater_bias | ;heater_bias | ||
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;heater_bias_len | ;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 | + | :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. |
| − | biases. This means the heater biases are applied by clock cycle #5. | ||
;enbl_mux | ;enbl_mux | ||
Revision as of 13:50, 20 January 2011
Address Card has a special multiplexing mode, enbl_mux = 3. In this mode, 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 DACS are updated with heater_bias values during the first heater_bias_len clock cycles, and with on_bias values for the remaining clock cycles of a row visit. The following parameters need to be set for this mode:
- 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.
- enbl_mux
set enbl_mux = 3 for this special multiplexing mode.
Note 1: these commands are only available in AC firmware 2.0.9 and 5.0.2. Note 2: bias_start parameter is not taken into account in this special multiplexing mode.
Here is a timing diagram of SQ1 Bias when enbl_mux = 3
