CM312 datasheet(24/56 Pages) ETC

24 / 56 page

CM312 Quad Serial utilityModule

RTD Embedded Technologies, Inc.

Table 6 PC/104 AT Bus Connector

PC/104 AT Bus Connector, CN2

Row C

Row D

SBHE*

MEMCS16*

LA23

IOCS16*

LA22

IRQ10

LA21

IRQ11

LA20

IRQ12

LA19

IRQ15

LA18

IRQ14

LA17

DACK0*

MEMR*

DRQ0

MEMW*

DACK5*

SD8

DRQ5

SD9

DACK6*

SD10

DRQ6

SD11

DRQ6

SD12

DRQ7

SD13

+5V

SD14

MASTER*

SD15

(KEYING PIN)

Note:

Two locations on the bus have mechanical keying pins to help prevent misconnection

of the PC/104 bus. These keying pins are a part of the PC/104 standard, and we

strongly recommend you leave them in place.

If you have other modules without keying pins, we suggest you modify them to

include keying.

First COM port, CN3

The first serial port is implemented on connector CN3. It can be configured as a PC compatible

full duplex RS232 port or as half- or full duplex RS422 or RS485 through mode jumper JP8. The

I/O address is configurable in respect to SW1 address table, and corresponding interrupt is also

selectable through jumper JP1 to be IRQ3, IRQ4, IRQ5, IR6, IRQ7, IRQ9, IRQ10, IRQ11, IRQ12,

IRQ14 and IRQ15. But you need to make sure that there are no resource conflicts on the I/O base

address and interrupt line you choose.

The serial port is implemented with a 16C550-compatible UART (Universal Asynchronous

Receiver/Transmitter). This UART is capable of baud rates up to 1.5 M with the 24 MHz clock

input and 115.2K with the 24 MHz / 13 clock input.

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