COREAI-XX Datasheet, PDF (15/25 Pages) Actel Corporation – CoreAI

CoreAI
Table 25 • ADC Status Register (high-order)
Bits
Name
Function
7
CALIBRATE
ADC Calibrate
1 – The ADC is busy performing its calibration.
0 – The ADC is calibrated.
(Refer to the Fusion datasheet for further information.)
6
SAMPLE
ADC Sample
1 – The ADC is sampling the selected analog input.
0 – Normal (no operation or the ADC has finished the sampling phase)
(Refer to the Fusion datasheet for further information.)
5
BUSY
ADC Busy
1 – The ADC is busy performing an analog-to-digital conversion.
0 – The ADC is not busy.
(Refer to the Fusion datasheet for further information.)
4
DATAVALID
ADC Data Valid
1 – The ADC contains valid data from an analog-to-digital conversion on the RESULT[11:0] outputs.
0 – Normal (no operation or current conversion continues)
(Refer to the Fusion datasheet for further information.)
3:0
RESULT[11:8]
ADC Result (high-order)
These bits come from the RESULT[11:8] bits of the AB macro.
(Refer to the Fusion datasheet for further information.)
Table 26 • Read FIFO Data Output Register
Bits
Name
Function
7:0
DOUT[7:0]
Read FIFO Data Output
If CoreAI is used in 8-bit APB read/write mode, the read FIFO must be read twice to retrieve one
ADC sample of result data (two bytes); in this case, the low-order byte would be read first and the
high-order byte second. Note also that in 8-bit APB read/write mode, the read FIFO will not become
empty until the last high-order byte has been read from the FIFO, i.e., an even number of reads
must occur. If CoreAI is used in 16-bit APB read/write mode, the read FIFO will be read as one 16-bit
word at once (with only the lower 12 bits being significant, since the ADC result has 12 bits of
resolution); in this case, DOUT[15:0] will appear on the PRDATA[15:0] output port, rather than
DOUT[7:0] appearing on PRDATA[7:0] as in 8-bit mode.
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