HD813201F (IC14) Terminal descriptions
Code
Terminal No.
I/O
Function
MAS
74
O
Memory Address Strobe (Memory address strobe terminal). When MAS
becomes "high" level, it indicates that address is output to MA/MD0 thru
MA/MD15 and MA16 thru MA21.
UDS
27
Three-state output
Upper Data Strobe (high-order data strobe terminal). When UDS becomes "low"
level, it indicates that IDP201 uses the high-order byte of the image bus.
LDS
23
Three-state output
Upper Data Strobe (low-order data strobe terminal). When LDS becomes "low"
level, it indicates that IDP201 uses the low-order byte of the image bus.
MDEN
25
O
Memory Data Bus Enable (Memory data bus enable terminal). When MDEN
output terminal becomes "low" level, it indicates that valid data are present in
MA/MD0 thru MA/MD15. This output terminal is used to control the output of the
bidirectional bus buffer on MA/MD0 thru MA/MD15.
MA/MD 0
79
I/O,
Three-state output
Memory Address Data Bus 0 thru 15 (Memory address data bus). In this bus for
image bus operation, the address and data are multiplexed. MA/MD0 thru
MA/MD15 are used as follows.
MA/MD 1
77
MA/MD 2
3
MA/MD 3
78
(1) When MAEN is "low" and MAS is "high", it is used as the output address line.
(2) When both MAEN and MDEN are "low" in the reading cycle, it is used as the
input data line.
(3) When both MAEN and MDEN are "low" in the writing cycle, it is used as the
input data line.
MA/MD 4
5
MA/MD 5
2
MA/MD 6
6
MA/MD 7
4
MA/MD 8
8
MA/MD 9
7
MA/MD10
12
MA/MD11
9
MA/MD12
14
MA/MD13
13
MA/MD14
15
MA/MD15
16
MA16
71
Three-state output
Memory Address Bus 16 thru 21 (memory address bus). When MAEN is "low"
and MAS is "high", it is used as the output address line.
MA17
11
MA18
30
MA19
31
MA20
50
MA21
51
MR
26
Three-state output
Memory Read (Memory read terminal). When MR is turned to "low" level,
IDP201 reads the data from the image memory.
MW
28
Three-state output
Memory Write (memory write terminal). When MW is turned to "low" level,
IDP201 writes the data in the image memory.
IOR
35
Three-state output
I/O Read (I/O read terminal). When IOR is turned to "low" level, IDP201 reads
the data from I/O device on the image bus. However, it is limited at DMA transfer
during data transfer with the transfer command and the coding process.
IOW
36
Three-state output
I/O Write (I/O write terminal). When IOW is turned to "low" level, IDP201 writes
the data in I/O device on the image bus. However, it is limited at DMA transfer
during data transfer with the transfer command and the decoding process.
DRQTI
39
I
DMA Request Input (DMA request input terminal). When I/O device on the
image bus requests DMA for IDP201, DRQTI becomes "high" level.
DACKO
38
O
DMA Acknowledge Output (DMA acknowledge output terminal). When this
output terminal is turned to "low" level, IDP201 informs to the peripheral devices
on the image bus that DMA operation is approved.
DMA
32
O
Direct Memory Access (Direct memory access terminal). When DMA output is
turned to "low", it indicates that DMA transfer is executed.
In the coding process, the data is transferred from the I/O device (scanner) to
the image memory.
In the decoding process, the data is transferred from the image memory to I/O
device (printer).
FO-4500H
5 – 12
Содержание FO-4500
Страница 16: ...M E M O FO 4500H 1 14 ...
Страница 129: ...Control PWB parts layout Top side 6 11 FO 4500H ...
Страница 130: ...Control PWB parts layout Bottom side 6 12 FO 4500H ...
Страница 133: ...TEL LIU PWB parts layout 6 15 FO 4500H ...
Страница 134: ...6 16 FO 4500H ...
Страница 136: ...Power supply PWB parts layout 6 18 FO 4500H ...
Страница 141: ...M E M O 6 23 FO 4500H ...
Страница 149: ...Scanner unit Fig 6 Optical adjustment tool Fig 7 Fig 8 FO 4500H 8 6 ...
