User`s manual

Am486

Microprocessor PCI Customer Development Platform

2-29

Serial Ports (E23 and C23)

The platform’s Super I/O device includes two 16550-compatible serial ports. These

are routed to two 9-pin D-shell connectors, J8 and J9. See Figure 2-7 and Table 2-

8. Light-emitting diodes (LEDs) are provided near each serial port to indicate

transmit and receive activity.

Figure 2-7. Serial Port Connector Pins (J8, J9)

Table 2-8. Serial Port Pin/Signal Table

IrDA Interface (A19)

The Super I/O device is configured to support infrared data transfers via an IrDA

LED module, part U44. The serial data transmission rates include all of the UART

bit rates (up to 115 Kbps).

The IrDA LED module is connected to dedicated pins on the M5113 Super I/O chip.

The IrDA interface shares one UART with serial port COM2. A control bit in the M5113

chip controls whether the UART communicates over the COM2 port or the IrDA port.

See the M5113: Enhanced Super I/O Controller Data Sheet, available from Acer

Laboratories Inc. See www.acerlabs.com for contact information.

Pin Signal

1DCD

2RXD

3TXD

4DTR

5 GND

6DSR

7RTS

8CTS

9RIN

Notes:

See Figure 2-3 on page 2-5 for connector locations.