DV-720H (serv.man19). IC Function List - Sharp DVD Service Manual (repair manual). Page 9

Pin No.

Pin name

Type

Direction

Function

31

HRD#—HDS#

I

I

Input

In host protocol type A (HTYPE=GNDP): HDS#. Data strobe input (active low).
In host protocol type B (HTYPE=VDDP): HRD#. Host read input (active low).

33

HRDY

3-S

O (p.d.)

Reset: output (low)
Standby: 3-S

Host ready output. When this signal is tri-stated (i.e., it requires a pull-up resistor), up to SysConfig.CodBurstLen
bytes of code can be written to the Decoder with no need to poll its condition in between. When HRDY is low during a
host access, the Decoder may still receive at least two additional bytes of code without corrupting the data.

34

HIRQ#

3-S

O (p.u.)

3-S (p.u.)

Interrupt request. This output signal requests an interrupt from the host controller, if one of the events associated to
interrupts occurs, and it is not masked-off. It is de-asserted if the host responds to the interrupt by reading the
interrupt status register, or if the host disables the interrupt, or after RESET.
Deassertion of the HIRQ# output has two modes: De-activated and then tri-stated or directly to is a tri-state condition.
The pin needs external pull-up resistor.

36

HACK#

3-S

O (p.u)

Reset: output (high)
Standby: 3-S (p.u.)

Host acknowledge output. In protocol A, the Decoder indicates that a read or write cycle is completed by asserting
this output. In protocol B, this signal is used by the Decoder to indicate a wait state that may be used by fast hosts.
In protocol B the host may ignore the HACK# signal.
When this signal is deasserted it is de-activated and then tri-stated. This pin needs an external pull-up resistor.

General Purpose I/O (Host Interface) (3 pins)

Pin No.

Pin name

Type

Direction

Function

147

GPAI/O

3-S

I/O (r.t.)

Reset: input
Standby: 3-S

General purpose input/output pin, monitored/controlled by the audio processor software. After RESET, this pin is
defined as inputs. Their definition can be configured through ADP commands.

172

GPSI

I

I

Input

General purpose input, monitored by the system de-multiplexer/video processor software.

171

DPSO

O

O (p.d.)

Reset: output (low)
Standby: 3-S

General purpose output, controlled by the system de-multiplexer/video processor software. After RESET it outputs a
low level.

DVD-DSP Interface (13 pins)

Pin No.

Pin name

Type

Direction

Function

159

DVDREQ

O

O (p.d.)

Reset: output (low)
Standby: 3-S

DVD-DSP data request output (programmable polarity).

157

DVDVALID

I

I

Input

DVD-DSP data valid input (programmable polarity).

156

DVDSOS

I

I

Input

DVD-DSP start of sector input (programmable polarity).

170

DVDDAT[7]

I

I

Input

169

DVDDAT[6]

168

DVDDAT[5]

167

DVDDAT[4]

166

DVDDAT[3]

164

DVDDAT[2]

162

DVDDAT[1]

161

DVDDAT[0]
DVD-DSP data input bus.

158

DVDSTRB

I

I

Input

DVD-DSP data bit strobe (clock) input. Programmable polarity.

155

DVDERR

I

I

Input

DVD-DSP error indication input. Programmable polarity.