Mitsubishi P91DW Operation Manual page 25

• Parallel input connector port
Signal allocation (Signal : ECP)
Pin No. Return
Signal
pin No.
1 19
HostClk
2
20
DATA1(LSB)
3
21
DATA2
4
22
DATA3
5
23
DATA4
6
24
DATA5
7
25
DATA6
8
26
DATA7
9
27
DATA8(MSB)
28
PeriphClk
10
29 PeriphAck
11
12
AckReverse
Xflag
13
HostAck
14
16•17 GND
18 High
19 - 30
GND
31
16 Reverse Request
Periph Request
32
15• NC
33 - 35
36 1284 Active
From/To
Forward data transfer : Becomes "Low" when PeriphAck is
PC/DP
"Low" and there is data to be read. Returns to "High" when
PeriphAck becomes "High".
PC/DP High: data 1
PC/DP Low: data 0
PC/DP
PC/DP Information will be expressed for parallel data of every signal
PC/DP from bit No.1 to No.8.
PC/DP
PC/DP
PC/DP
PC/DP
Reverse data transfer : Sends "Low" data when HostAck is
"Low". Returns to "High" when HostAck becomes "High".
Forward data transfer:
PC/DP
High: DP is on BUSY status.
Low: DP can accept data.
High: Forward data transfer (Receive)
PC/DP
Low: Reverse data transfer (Send)
PC/DP High: During supporting ECP mode
Reverse data transfer:
PC/DP
High: PC is on BUSY status.
Low: PC can send data.
Earth
PeripheralLogicHigh
PC/DP
PC/DP
Earth
Low : When PC requests DP to send data
PC/DP
PC/DP Low : When DP requests PC to send data
Unused
Becomes "High" when DP requests each mode of IEEE1284.
PC/DP
22
Function