L64780 LSI Logic Corporation, L64780 Datasheet - Page 94

• Manufacturer Part Number: L64780
• Description: Dvb-t Cofdm Demodulator Technical Manual 2/00
• Manufacturer: LSI Logic Corporation

5.3 Main Signals
5-4
INTn
P_S
READ
This section lists and describes the main signals input to the L64780 or
output to the L64705/L64724.
ADCGVDD
ADCGVSS
ADCPD
ADCVDD
ADCVREFN
ADCVREFP
ADCVSS
AVIN
Signal Descriptions
Interrupt
The DTTV receiver asserts INTn when an internal,
unmasked interrupt flag is set. INTn remains asserted as
long as the interrupt condition persists and the interrupt
flag is not masked. When not driven, the line is open-
drain 3-stated.
Microprocessor Operation Mode
When this signal is LOW, operation is Parallel Mode;
when HIGH, operation is Serial Mode.
Read Strobe
When HIGH, a read operation is selected; when LOW, a
write operation is selected. In Serial interface mode,
READ must be connected to VDD.
Guard VDD for Internal ADC
Must be connected to VDD.
Internal ADC Guard VSS
Must be connected to ground.
Power-Down Mode for Internal ADC
This pin is active HIGH and in normal mode must be con-
nected to ground.
Analog VDD for Internal ADC
Must be connected to VDD.
Internal ADC Negative Reference Voltage
When not used, this pin must be connected to ground.
Internal ADC Positive Reference Voltage
When not used, this pin must be connected to ground.
Analog VSS for Internal ADC
Must be connected to ground.
Analog Input for Internal ADC
For an external ADC, this pin must be connected to
ground.
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