Mitsubishi Electronics P91DW User Manual download pdf (Page 25)

Pin No.

Return

pin No.

Signal

From/To

Function

119

HostClk

PC/DP

Forward data transfer : Becomes “Low” when PeriphAck is

“Low” and there is data to be read. Returns to “High” when

PeriphAck becomes “High”.

High: data 1

Low: data 0

Information will be expressed for parallel data of every signal

from bit No.1 to No.8.

Reverse data transfer : Sends “Low” data when HostAck is

“Low”. Returns to “High” when HostAck becomes “High”.

Forward data transfer:

High: DP is on BUSY status.

Low: DP can accept data.

High: Forward data transfer (Receive)

Low: Reverse data transfer (Send)

High: During supporting ECP mode

Earth

PeripheralLogicHigh

Low : When PC requests DP to send data

Unused

Becomes “High” when DP requests each mode of IEEE1284.

PC/DP

DATA1(LSB)

DATA2

DATA3

DATA4

DATA5

DATA6

DATA7

DATA8(MSB)

PeriphClk

PeriphAck

AckReverse

16•17

Earth

19 - 30

15•

33 - 35

Xflag

HostAck

GND

High

Reverse Request

GND

1284 Active

Reverse data transfer:

High: PC is on BUSY status.

Low: PC can send data.

Periph Request

Low : When DP requests PC to send data

• Parallel input connector port

Signal allocation (Signal : ECP)

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Mitsubishi Electronics P91DW User Manual Page 25

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