Appendixes

Interfaces

Parallel port status signals when an error occurs

The status of a signal line will not be changed in bi-directional mode such as nibble or ECP mode.

Error

Change in the status of a signal line in

 

compatible mode

 

 

 

Paper end

Busy

: L ￿ H

 

PError

: L ￿ H

 

Select

: H ￿ L

 

nFault

: H ￿ L

 

 

 

Error other than paper end

Busy

: L ￿ H

• Head open

PError

: L ￿ unchanged

• Other

Select

: H ￿ L

 

nFault

: H ￿ L

 

 

Conditions for Busy

• Receive buffer full

 

• Data being read

 

• Error

 

 

 

 

Compatible timing specification

[When power is on] (Time it goes off-line)

PowerOn

Reset

BUSY

*ACK

SELECT

[While receiving data]

Data0-7

*Strobe

BUSY

0.5∝s 0.5∝s 0.5∝s

Note: Busy rises when *Strobe signal starts, and data is latched with *Strobe signal starts.

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