Onkyo HT-R820THX Service Manual page 48

IC BLOCK DIAGRAM AND TERMINAL DESCRIPTIONS-11
Q701: CS494003CQZ (Multi-Standard Audio Decoder)-5
TERMINAL DESCRIPTION
SDATAN1, GPIO25 - PCM Audio Input Data, General Purpose I/O
Digital-audio PCM data input. This pin can act as a general-purpose input or output that can be individually configured and controlled by DSPC.
BIDIRECTIONAL - Default: INPUT
SDATAN2, GPIO26 - PCM Audio Input Data, General Purpose I/O
Digital-audio PCM data input. This pin can act as a general-purpose input or output that can be individually configured and controlled by DSPC.
BIDIRECTIONAL - Default: INPUT
SDATAN3, GPIO27 - PCM Audio Input Data, General Purpose I/O
Digital-audio PCM data input. This pin can act as a general-purpose input or output that can be individually configured and controlled by DSPC.
BIDIRECTIONAL - Default: INPUT
SCS - Host Serial SPI Chip Select
SPI mode active-low chip-select input signal. INPUT
SCCLK - Serial Control Port Clock
This pin serves as the serial SPI clock input. INPUT
SCDIN - SPI Serial Control Data Input
In SPI mode this pin serves as the data input pin. INPUT
SCDOUT, SCDIO - Serial Control Port Data Input and Output
In SPI mode this pin serves as the data output pin. BIDIRECTIONAL - Default: OUTPUT in SPI mode
INTREQ - Control Port Interrupt Request
Open-drain interrupt-request output. This pin is driven low to indicate that DSPC has outgoing control data and should be serviced by the host.
OPEN DRAIN I/O - Requires 3.3K Ohm Pull-Up
HDATA1~HDATA7, GPIO1~GPIO7 - DSPC Bidirectional Data Bus, General Purpose I/O
HDATA0, GPIO0
In parallel host mode, these pins provide a bidirectional data bus. These pins can also act as general purpose input or output pins that can be individually
configured and controlled by DSPC. These pins have an internal pull-up. BIDIRECTIONAL - Default: INPUT
A0, GPIO13 - Host Parallel Address Bit 0, General Purpose I/O
In parallel host mode, this pin serves as the LS Bit of a two bit address input used to select one of four parallel registers. This pin can act as
a general-purpose input or output that can be individually configured and controlled by DSPC. BIDIRECTIONAL - Default: INPUT
A1, GPIO12 - Host Address Bit 1, General Purpose I/O
In parallel host mode, this pin serves as the MS Bit of a two bit address input used to select one of four parallel registers. This pin can act as
a general-purpose input or output that can be individually configured and controlled by DSPC. BIDIRECTIONAL - Default: INPUT
RD, R/W, GPIO11 - Host Parallel Output Enable, Host Parallel R/W, General Purpose I/O
In Intel parallel host mode, this pin serves as the active-low data bus enable input. In Motorola parallel host mode, this pin serves
as the read-high/write-low control input signal. This pin can act as a general-purpose input or output that can be individually configured and
controlled by DSPC. This pin has an internal pull-up. BIDIRECTIONAL - Default: INPUT
WR, DS, GPIO10 - Host Write Strobe, Host Data Strobe, General Purpose I/O
In Intel parallel host mode, this pin serves as the active-low data bus enable input. In Motorola parallel host mode, this pin serves as
the read-high/write-low control input signal. In serial host mode, this pin can serve as a general purpose input or output bit. This pin can act as a
general-purpose input or output that can be individually configured and controlled by DSPC. This pin has an internal pull-up.
BIDIRECTIONAL - Default: INPUT
CS, GPIO9 - Host Parallel Chip Select, General Purpose I/O
In parallel host mode, this pin serves as the active-low chip-select input signal. This pin can act as a general-purpose input or output that can be
individually configured and controlled by DSPC. This pin has an internal pull-up. BIDIRECTIONAL - Default: INPUT
HINBSY, GPIO8 - Input Host Message Status, General Purpose I/O
This pin indicates that serial or parallel communication data written to the DSP has not been read yet. This pin can act as a general-purpose input or
output that can be individually configured and controlled by DSPC. This pin has an internal pull-up. BIDIRECTIONAL - Default: OUTPUT
SD_DATA8~SD_DATA15, EXTA11~EXTA18 - SDRAM Data Bus, SRAM External Address Bus
SDRAM data bus 15:8. SRAM external address bus 18:11. OUTPUT
TX-SR502/E/8250/HT-R520