Table 10. adc fifo depth bit configuration – Rainbow Electronics MAX1329 User Manual
Page 45
MAX1329/MAX1330
12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,
Reference, Voltage Monitors, and Temp Sensor
______________________________________________________________________________________
45
Table 10. ADC FIFO Depth Bit
Configuration
AFFD3
AFFD2
AFFD1
AFFD0
ADC FIFO
WORD
DEPTH
WRITE
POINTER
RANGE
0
0
0
0
FIFO disabled
0
0
0
1
2
0-1
0
0
1
0
3
0-2
0
0
1
1
4
0-3
0
1
0
0
5
0-4
0
1
0
1
6
0-5
0
1
1
0
7
0-6
0
1
1
1
8
0-7
1
0
0
0
9
0-8
1
0
0
1
10
0-9
1
0
1
0
11
0-10
1
0
1
1
12
0-11
1
1
0
0
13
0-12
1
1
0
1
14
0-13
1
1
1
0
15
0-14
1
1
1
1
16
0-15
Table 11. ADC FIFO Interrupt-Address Bit
Configuration
AFFI3
AFFI2
AFFI1
AFFI0
ADC FIFO
INTERRUPT
ADDRESS
0
0
0
0
0
0
0
0
1
1
0
0
1
0
2
0
0
1
1
3
0
1
0
0
4
0
1
0
1
5
0
1
1
0
6
0
1
1
1
7
1
0
0
0
8
1
0
0
1
9
1
0
1
0
10
1
0
1
1
11
1
1
0
0
12
1
1
0
1
13
1
1
1
0
14
1
1
1
1
15
MSB
NAME
AFFDATA11
AFFDATA10
AFFDATA9
AFFDATA8
AFFDATA7
AFFDATA6
AFFDATA5
AFFDATA4
DEFAULT
0
0
0
0
0
0
0
0
LSB
NAME
AFFDATA3
AFFDATA2
AFFDATA1
AFFDATA0
AFFA3
AFFA2
AFFA1
AFFA0
DEFAULT
0
0
0
0
0
0
0
0
Note: Data length can vary from 1 to 16 words, where a word is 16 bits (12 data bits plus 4 address bits).
Read Format
A single read from the ADC FIFO register returns the
ADC FIFO data and the 4-bit FIFO address (AFFA<3:0>)
corresponding to the location read.
After clocking out the 16-bit word, the read pointer
increments and continual clock shifts out the 16-bit
word at the location pointed to by the ADC FIFO read
pointer. If trying to read from the ADC FIFO at a location
pointed to by the ADC FIFO write pointer, the FIFO
repeats the last ADC conversion result and correspond-
ing ADC FIFO address equivalent to the ADC FIFO
write pointer. To stop reading, bring
CS high after
clocking out the 16th bit of a complete word. The read
pointer increments after each complete 16-bit word
read. It does not increment if the read is aborted by
bringing
CS high before clocking out all 16 bits. Any
read operation on the ADC FIFO register resets the
interrupt flag (AFF).
AFFDATA<11:0>: ADC FIFO Read Data bits (default =
0000 0000 0000). AFFDATA<11:0> returns the data
written by the ADC at the current read pointer location.
AFFA<3:0>: ADC FIFO Read Address bits (default =
0000). AFFA<3:0> returns the address of the current
read pointer location. AFFA<3:0> is never greater than
the AFFD<3:0> programmed value.