AX99100QI datasheet(12/70 Pages) ASIX

12 / 70 page

AX99100

PCIe to Multi I/O Controller

1.4.2

Serial Interface for COM Port

Table 1-5: Serial Interface for COM Port Pin Description

Serial Interface for COM Port

Pin Name

Type

Pin No

Pin Description

TXD1

TXD2

TXD3

TXD4

O5/4m

Transmit data output to transceiver or IrDA data output to IR LED

DTR1

DTR2

DTR3

DTR4

B5/PD/4m

Data Terminal Ready

These pins have internal pull-down during reset. If there is the external pull-up

resisters connected to these pins separately, it will work for RS-232 function with

active low. Otherwise, it will work for RS-485 function (DXEN) with active high

and the output can be enabled by register (the default is disabled). Please

reference to Section 3.2.

RTS1

RTS2

RTS3

RTS4

O5/4m

Request to send (Active Low)

Note: These pins will be changed to RXEN when Software enabled RS-485

function for the corresponding ports.

RXD1

RXD2

RXD3

RXD4

I5/PU

Serial received data input from transceiver or IrDA data input from IrDA

detector.

RI1

RI2

RI3

RI4

Ring Indicator (Active Low)

DSR1

DSR2

DSR3

DSR4

Data Set Ready (Active Low)

DCD1

DCD2

DCD3

DCD4

Data Carrier Detect (Active Low)

CTS1

CTS2

CTS3

CTS4

Clear to send (Active Low)

Note 1: Serial Port 1 and 2 are only valid when CHIP_MODE = 001, 011, 101 and 110.

Note 2: Serial Port 3 and 4 are only valid when CHIP_MODE = 011.

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