Difference between revisions of "Special SQ1 Bias Commands"
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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: | 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: | ||
| − | |||
| − | ;heater_bias | + | ;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. | :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 | + | ;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. | ||
| − | Note | + | ;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 | Here is a timing diagram of SQ1 Bias when enbl_mux = 3 | ||
[[File: ac_enbl_mux_3_scheme.png|400px]] | [[File: ac_enbl_mux_3_scheme.png|400px]] | ||
Revision as of 13:30, 20 January 2011
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:
- 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
