TV Converter Box User Manual

Conversation Between the TLV1562 and the DSP
16 SLAA040
7.5 Mono Continuous Mode
This mode simplifies data acquisition, since there is no need to generate a signal
to sample or convert data. Instead, initializing this mode once, the ADC sends out
the data continuously and will be read by the DSP with the RD
signal.
CAUTION:
In this mode, the sampling result sent out by the ADC is the
value of the sample from the last cycle. Therefore, the first
sample after initialization is trash.
Table 10. DSP Algorithm for Mono Continuous Mode
Wait cycles for the DSP internally (40MHz DSPCLK):
STEPS TIMING, NOTES
APD=0
ADCSYCLK
= 7.5 MHz
APD=0
ADCSYCLK
= 10 MHz
APD=1
ADCSYCLK
= 10 MHz
APD=1
ADCSYCLK
= 10 MHz
0. Initialization N/A N/A
Write all configuration data to the
ADC
Activate the mono continuous mode in
CR0(2;3)
N/A N/A
1. Set CS Deselect ADC N/A N/A
2. wait for t
(SAMPLE1)
t
(SAMPLE1)
= 100 ns ≥4 ≥4 N/A N/A
3. Clear CS Select ADC N/A N/A
4. Clear RD Start conversion N/A N/A
5. Wait the time t
EN(DATAOUT)
t
EN(DATAOUT)
= 41 ns ≥2 ≥2 N/A N/A
6. Read sample out from the data port;
reset RD
signal
(Caution: the first result after initialization
is trash)
N/A N/A
7. Wait for the time t
(CONV1)
minus
step 7 and 8 to ensure 5(6) ADC-
SYSCLk
t
(CONV1)
= 5(6) ADCSYSCLK; since step
7 and 8 take at least 4 DSPSYSCLK, the
calculation are 5(6) ADCSYSCLK minus
100 ns
≥23 ≥16 N/A N/A
8. Go to step 4 for more samples N/A N/A