The baseboard system FPGA implements registers and a 4-wire serial interface to the CT1156T2F-S PLD to enable you to:
change the voltage supplied to the ARM1156T2F-S test chip by writing values to the serially-programmed digital to analog converters (DACs)
read CT1156T2F-S on-board voltages and currents from an 8-channel 12-bit analog to digital converter (ADC).
The voltage control and voltage and current monitoring scheme is shown in simplified form in Figure 3.6.
The serial write data register in the CT1156T2F-S PLD is updated continuously with values from the system registers in the baseboard system FPGA. These values control VOLTAGE_CTRLA and VOLTAGE_CTRLB that set the voltages applied to the ARM1156T2F-S test chip.
The system registers in the baseboard system FPGA are continually updated with voltage and current monitoring values from the serial read data register in the CT1156T2F-S PLD.
The DAC and ADC data values are transferred via the 4-wire serial interface.
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