Sharp DV-550U, Service Manual

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DV-550U
12-8. IC601 IX1475GE
VIDEO/AUDIO DECODER
Pin No. Pin name Type Direction Function
22
HA[3:0] I I
Address bus input for microcomputer connection.
24-26 Used for register access and so on
HTYPE = L
It works as HR/W#(read/write) input terminal for connection to Motorola
27
HWR#
I I
type microcomputer.
(HR/W#) HTYPE = H
It works as HWR# (write) input terminal for connection to general purpose
microcomputer.
29 HCS# I I Chip select input for connection to microcomputer
HTYPE = L
It works as HDS#(data strobe) input terminal for connection to Motorola
30
HRD#
I I
type microcomputer.
(HDS#) HTYPE = H
It works as HRD# (read) input terminal for connection to general purpose
microcomputer.
Bit stream input ready output terminal If the bit stream is input from
microcomputer, the terminal is bored.
For 3-state output, connect the pull-up resistor.
HRDY = L
31 HRDY 3-S O Bit stream can not be input.
HRDY = H
The number of bytes which are set by CodBurstLen parameter can be
transferred from the microcomputer. During the time from transfer start of
the number of set bytes to transfer end, the terminal varies in 3 states.
HTYPE = L
It works as HACK# (acknowledge) output terminal for connection to
32
HACK#
3-S O
Motorola type microcomputer.
(HWAIT#)
HTYPE = H
It can be used as the weight terminal for connection to the general pur
pose microcomputer.
For 3-state output, connect the pull-up resistor.
Interrupt request. If interrupt status register is read, interrupt is masked or
34 HIRQ# 3-S O device is reset, the signal is deasserted.
For 3-state output, connect the pull-up resistor.
The bus width of the microcomputer interface If the device is worked as
CD-G decoder or CD-DSP is connected, select the 8-bit bus mode.
35 HWID I I Fix it before power up.
L=8bit bus mode
H=16bit bus mode
When HWID is H (16-bit bus MODE), byte order is set.
Setting is valid only when HWID is H.
36 HORD I I Fix it before power up.
L=HD [15:8] is regarded as m.s. byte. (Motorola type)
H=HD [7:0] is regarded as m.s. byte. (Intel type)
Bus type of microcomputer interface is set.
37 HTYPE I I
Fix it before power up.
L=Motorola type
H=General purpose type
141 RESET# I I RESET is input.
142 IDLE 3-S O It is output to indicate the idle state.
Microcomputer interface
Microcomputer interface terminal list
12-12