AX88796 datasheet(15/71 Pages) ASIX

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ASIX ELECTRONICS CORPORATION

AX88796 L

3-in-1 Local Bus Fast Ethernet Controller

2.6 Standard Printer Port (SPP) Interface pins group (Optional)

SIGNAL

TYPE

PIN NO.

DESCRIPTION

PD[7:5]

PD[4:0]

I/O/PD

I/O/PU

102 – 100

99 - 95

Parallel Data :The bi-directional parallel data bus is used to transfer

information between CPU and peripherals. Default serve as input,

using /DOE bit of register offset x1Ah to set the direction.

BUSY

I/PU

108

Busy : This is a status input from the printer, high indicating that the

printer is not ready to receive new data.

/ACK

I/PU

107

Acknowledge : A low active input from the printer indicating that it

has received the data and is ready to accept new data.

I/PU

106

Paper Empty : A status input from the printer, high indicating that the

printer is out of paper.

SLCT

I/PU

103

Slect: This high active input from the printer indicating that it has

power on.

/ERR

I/PU

113

Error : A low active input from the printer indicating that there is an

error condition at the printer.

/SLCTIN

112

Slect In: This active low output selects the printer.

/INIT

111

Init: This signal is used to initiate the printer when low.

/ATFD

110

Auto Feed :This output goes low to cause the printer to automatically

feed one line after each line is printed.

/STRB

109

Strobe : A low active pulse on this output is used to strobe the print

data into the printer.

Tab - 6 Standard Printer Port Interface pins group

2.7 General Purpose I/O pins group

Signal Name

Type

Pin No.

Description

GPI[2]/SPD

I/PU

113

Read register offset 17h bit 6 value reflects this input value.

GPI[1]/DPX

I/PU

106

When MII port is selected. Read register offset 17h bit 5 value reflects

this input value.

When SPP port is selected. The pin is defined as PE.

GPI[0]/LINK

I/PU

103

When MII port is selected. Read register offset 17h bit 4 value reflects

this input value.

When SPP port is selected. The pin is defined as SLCT.

GPO[0]

120

Default “1”. The pin reflects write register offset 17h bit 0 inverted

value.

Tab - 7 General Purposes I/O pins group

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