CM312 datasheet(16/56 Pages) ETC

16 / 56 page

CM312 Quad Serial utilityModule

RTD Embedded Technologies, Inc.

Descriptions

The following table describes the functions of the jumpers.

Table 2 Switch and Jumper tables

Jumper

Use

JP 1

IRQ selection for COM1

G setting: jumper installed = 1K pull down resistor for the selected IRQ

Jumper removed = no pull down for the selected IRQ

Default: 3-4, IRQ4 is selected for CN3 with G jumper installed (1K pull-down)

JP 2

IRQ selection for COM2

G setting: jumper installed = 1K pull down resistor for the selected IRQ

Jumper removed = no pull down for the selected IRQ

Default: 1-2, IRQ3 is selected for CN4 with G jumper installed (1K pull-down)

JP3

IRQ selection for COM3

G setting: jumper installed = 1K pull down resistor for the selected IRQ

Jumper removed = no pull down for the selected IRQ

Default: 5-6, IRQ5 is selected for CN5 with G jumper installed (1K pull-down)

JP 4

IRQ selection for COM4

G setting: jumper installed = 1K pull down resistor for the selected IRQ

Jumper removed = no pull down for the selected IRQ

Default: 13-14, IRQ10 is selected for CN6

With G jumper installed (1K pull-down)

JP5

Input clock selection for serial ports

1-2 = select 24 MHz input clock to UART

2-3 = select 24 MHz / 13 input clock to UART

Default: 2-3 jumped, to select 1.8432 MHz to UART

JP6

Ethernet EEPROM enable

1-2 installed = Factory use

1-2 open = Normal Operation

Default: 1-2 open to enable normal Ethernet EEPROM operation

JP7

Reserved, leave open

1-2 installed = Not allowed

1-2 open = Normal operation

Default: 1-2 always open

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