ASIX AX99100 User Manual

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Copyright © 2016 ASIX Electronics Corporation. All rights reserved.
AX99100
PCIe to Multi I/O Controller
1.4.3 Serial Interface for Multi-Protocol Transceiver
Table 1-6: Serial Interface for Multi-Protocol Transceiver Pin Description
Serial interface for Multi-Protocol Transceiver
Pin Name
Type
Pin No
Pin Description
TXD1
TXD2
TXD3
TXD4
O5/4m
9
68
50
42
Transmit data output to transceiver or IrDA data output to IR LED
DXEN1
DXEN2
DXEN3
DXEN4
B5/PD/4m
8
67
49
41
Driver Enable
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 with active high and the
output can be enabled by register (the default is disabled). Please reference to
Section3.2.
RTS1
RTS2
RTS3
RTS4
O5/4m
7
66
48
40
Request to send (Active Low)
RXD1
RXD2
RXD3
RXD4
O5/PU/4m
5
65
47
38
Serial received data input from transceiver or IrDA data input from IrDA
detector.
485EN1
485EN2
485EN3
485EN4
O5/4m
3
64
46
34
Interface Selection
1: RS-485 selected
0: RS-232 selected
485TE1
485TE2
485TE3
485TE4
O5/4m
4
63
45
33
RS485 Termination Enable for transceiver.
RXEN1
RXEN2
RXEN3
RXEN4
O5/4m
2
62
44
32
Receiver Enable
1: Enable Receiver
0: Disable Receiver
Note: Software should enable RS-485 function for the corresponding ports first.
CTS1
CTS2
CTS3
CTS4
I5
1
61
43
31
Clear to send (Active Low)
Note 1: Serial Port 1 and 2 are only valid when CHIP_MODE = 010, 100 and 111.
Note 2: Serial Port 3 and 4 are only valid when CHIP_MODE = 101 and 111.

ASIX AX99100 Specifications

General

Brand	ASIX
Model	AX99100
Category	Controller
Language	English