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Line 20: − [[Programming_the_SPI|SPI module]]'s return values+ − * ''Done'': [in] ; "Done" signal from the SPI Module+ − * ''Temp_in'': [in ] SPI module's latched 10-bit temperature output bus+ − + − + − + − − Data request signals for the [[Programming_the_SPI|SPI module]] − − − − + − + − + − + − +
→Programming Details
== Programming Details ==
== Programming Details ==
The Querier polls the [[Programming_the_SPI|SPI module]] to poll the Temperature sensor chip and then the 8 channels of the ADC. The channels are shuffled by means of a simple counter (possibly starting from 111 then 000, 001 etc.) Each "Done" signal from the [[Programming_the_SPI|SPI module]] is passed back as a "Go" signal for the next poll. The [[FPGA_Registers#Temperature Register|appropriate registers]] are pulsed simultaneously to record the values for later transmission. As mentioned above, the ADC address returned by the SPI Module along with the voltage data is checked against the requested address. Mismatch results in the error value of 0xFFF recorded in lieu of the returned value.
The Querier polls the [http://zeus.phys.uconn.edu/wiki/index.php/SiPM_digital_control_board#Temperature_sensor Temperature Sensor] and the 8 channels of the [http://zeus.phys.uconn.edu/wiki/index.php/SiPM_digital_control_board#The_ADC ADC], by shuffling down in channel number and polling child modules that handle the chip interfacing.
SPI bus lines
* ''SPI_SCLK'': [out] 5MHz clock feed-through
* ''SPI_T_CE'': [out] Temp. sensor chip enable
* ''ADC_in'': [in ] SPI module's latched 12-bit ADC output bus
* ''SPI_A_iCS'': [out] ADC active-low chips select
* ''ADC_Ain'': [in ] SPI module's latched 3-bit ADC address output bus
* ''SPI_SDI'': [out] SPI (Temp sensor/ADC) input line
* ''SPI_SDO'': [in] SPI output - return values for the FPGA
* ''Go'': [out] "Go" signal
* ''T_iA'': [out] active-high Temp. sensor, active-low ADC selection line
* ''ADC_Aout'': [out] 3-bit ADC address line
Temperature and ADC value storage
Temperature and ADC value storage
* ''ADCregEn'': [out] write signal to ADC register
* ''ADCreg_En'': [out] write signal to ADC register
* ''ADCregA '': [out] 3-bit address selection for ADC register
* ''ADCreg_A '': [out] 3-bit address selection for ADC register
* ''TempregEn'': [out] write signal to Temperature register
* ''ADCred_D'': [out] 12-bit ADC value output to the ADC register
* ''Temp'': [out] Temperature value output to the Temperature register
* ''Tempreg_En'': [out] write signal to Temperature register
* ''ADC'': [out] ADC value output to the ADC register
* ''Tempreg_D'': [out] 10-bit Temperature value output to the Temperature register