Ramp Generator
From MCEWiki
- The MCE can be set to write values to internal registers. For arbitrary shapes, see Arbitrary Waveform Generator .
- Setup for simple ramps is similar to the setup for arbitrary waveforms.
- The ramp operates between a minimum and maximum value, with some step value. Once the maximum value is passed, the ramp will reset to the minimum value and repeat.
- The ramp can only operate on a single MCE register at a time. This means that parameters that are spread over multiple cards can not be ramped simultaneously.
For script-level support: see mce_internal_ramp.
Low-Level MCE Parameters for internal Ramp
If you are writing your own script, the following MCE parameters need to be set:
- internal_cmd_mode, ramp_step_period, ramp_param_id, ramp_card_addr, ramp_step_data_num, ramp_min_val, ramp_max_val, ramp_step_size, ramp_step_phase(optional).
Refer to MCE Command Description for details.
- Example:
wb cc internal_cmd_mode 0 # Disable internal commanding wb cc ramp_card_addr 7 # Card id for BC1 wb cc ramp_param_id 0x21 # Parameter id for bias wb cc ramp_step_data_num 1 # number of data elements for bias wb cc ramp_step_period 10 # Number of multiplexing frames between issuing the internal ramp command wb cc ramp_min_val 0 # Ramp is defined by its min/max and step values. wb cc ramp_step_size 10 # wb cc ramp_max_val 200 # wb cc internal_cmd_mode 2 # Enable internal ramp
Card and parameter IDs
To determine the card and parameter ids in your MCE, run "mce_status" with the "-g" option (this option forces a dump of the active mce.cfg hardware configuration file details without issuing any MCE commands). e.g.:
$ mce_status -g
physical psc brst 0x60 1 cards: 0x01
physical psc cycle_pow 0x61 1 cards: 0x01
...
physical bc1 scratch 0x9a 1 cards: 0x07
physical bc1 flux_fb 0x20 1 cards: 0x07
physical bc1 bias 0x21 1 cards: 0x07
physical bc1 flux_fb_upper 0x24 1 cards: 0x07
...
virtual sa bias maps: [(0,8)->('rc1 sa_bias'+ 0)] [(8,8)->('rc2 sa_bias'+ 0)]
virtual sa offset maps: [(0,8)->('rc1 offset'+ 0)] [(8,8)->('rc2 offset'+ 0)]
virtual tes bias maps: [(0,1)->('bc1 bias'+ 0)] [(1,1)->('bc2 bias'+ 0)] [(2,1)->('bc3 bias'+ 0)]
From this dump we see that the "tes bias" virtual parameter is mapped, in this MCE, to the bias card "bias" parameters. We then note that "bc1 bias" corresponds to parameter id 0x21 and card id 0x07.
