Hdata0, Gpio0; A0, Gpio13 --- Host Parallel Address Bit 0, General Purpose I/O; A1, Gpio12 --- Host Address Bit 1, General Purpose I/O; Cs, Gpio9 --- Host Parallel Chip Select, General Purpose I/O - Onkyo HT-R530 Service Manual

IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-9
Q201: CS494003CQZ (Multi-Standard Audio Decoder)-8/11

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 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/white-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 is 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_DATA15, EXTA18 --- SDRAM Data Bus, SRAM External Address Bus
SD_DATA14, EXTA17
SD_DATA13, EXTA16
SD_DATA12, EXTA15
SD_DATA11, EXTA14
SD_DATA10, EXTA13
TX-SR503/503E/8350