AX99100QI datasheet(26/70 Pages) ASIX

26 / 70 page

AX99100

PCIe to Multi I/O Controller

Table 3-2: Chip Mode Selection Table

CHIP_

Mode[2:0]

4MP

2S1SPI

2S2MP

2MP1SPI

2MP1P

2S1P

111

110

101

100

011

010

001

000

Port 1

Multi-

Protocol

Serial

Port

Serial

Port

Multi-

Protocol

Serial

Port

Multi-

Protocol

Serial

Port

Local

Bus

Port 2

Multi-

Protocol

Serial

Port

Serial

Port

Multi-

Protocol

Serial

Port

Multi-

Protocol

Serial

Port

Port 3

Multi-

Protocol

GPIO

Multi-

Protocol

GPIO

Serial

Port

Parallel

Port

Parallel

Port

Port 4

Multi-

Protocol

SPI

Multi-

Protocol

SPI

Serial

Port

Note: The AX99100 Multi-protocol Mode is designed to support the Multi-protocol transceiver. Please contact ASIX

product support for the detail.

DTR Boot Strapping Pins for Serial Port

3.2

Each Serial Port or Serial Port with multi-protocol transceivers mode can support for RS-232 or RS-485 function, the

DTR/DXEN pin will has different behavior for the both mode. In Hardware design, each DTR/DXEN pin has internal

pull-down during reset. User may use the external pull-up resister to decide which mode is selected for operation.

Pins

Signal Name

Description

DTR_MODE[0]

DTR Mode Select bit 0 for Serial Port 1

1: Added external pull-up resistor to this pin. It works for RS-232

mode with active low.

0: Otherwise, means to use internal pull-down to this pin. It works

for RS-485 mode with active high.

DTR_MODE[1]

DTR Mode Select bit 1 for Serial Port 2

1: Added external pull-up resistor to this pin. It works for RS-232

mode with active low.

0: Otherwise, means to use internal pull-down to this pin. It works

for RS-485 mode with active high.

DTR_MODE[2]

DTR Mode Select bit 2 for Serial Port 3

1: Added external pull-up resistor to this pin. It works for RS-232

mode with active low.

0: Otherwise, means to use internal pull-down to this pin. It works

for RS-485 mode with active high.

DTR_MODE[3]

DTR Mode Select bit 3 for Serial Port 4

1: Added external pull-up resistor to this pin. It works for RS-232

mode with active low.

0: Otherwise, means to use internal pull-down to this pin. It works

for RS-485 mode with active high.

Table 3-3: DTR Mode selection Pins

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