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Chapter 3 Hardware

CoreModule 920 Reference Manual 25

Serial Interfaces

The CoreModule 920 provides two RS-232 serial ports. The PCH BD82QM67 contains the circuitry for

both serial ports and delivers the signals through two RS-232 transceivers: one transceiver for COM1 and

the second transceiver for COM2. The serial ports support the following features:

• Two individual high-speed NS16C550A-compatible UARTs (COM1 and COM2)

• Programmable word length, stop bits, and parity

• 16-bit programmable baud rate generator

• Loop-back mode

• Two individual 16-bit FIFOs

• Serial Port Headers



J18 - Serial 1 (COM1) supports RS-232 and full modem



H16 - Serial 2 (COM2) supports RS-232 and full modem

Table 3-4 defines the pins and corresponding signals for serial 1 header (J18), which consists of 10 pins, 2

rows, odd/even sequence (1, 2), and 0.079" (2mm) pitch.

Note: The shaded table cell denotes ground. The * symbol indicates the signal is Active Low.

Table 3-4. Serial 1 (COM1) Interface Pin Signal Descriptions (J18)

Pin # Signal DB9

Pin #

Description

1 S1_DCD* 1 COM1 Data Carrier Detect – Indicates external serial device is detecting

a carrier signal (i.e., a communication channel is currently open). In

direct connect environments, this input is driven by DTR as part of the

DTR/DSR handshake.

2 S1_DSR* 6 COM1 Data Set Ready – Indicates external serial device is powered,

initialized, and ready. Used as hardware handshake with DTR for overall

readiness.

3 S1_RXD 2 COM1 Receive Data – Serial port receive data input is typically held at a

logic 1 (mark) when no data is being transmitted, and is held “Off” for a

brief interval after an “On” to “Off” transition on the RTS line to allow

the transmission to complete.

4 S1_RTS* 7 COM1 Request To Send – Indicates serial port is ready to transmit data.

Used as hardware handshake with CTS for low level flow control.

5 S1_TXD 3 COM1 Transmit Data – Serial port transmit data output is typically held

to a logic 1 when no data is being sent. Typically, a logic 0 (On) must be

present on RTS, CTS, DSR, and DTR before data can be transmitted on

this line.

6 S1_CTS* 8 COM1 Clear To Send – Indicates external serial device is ready to

receive data. Used as hardware handshake with RTS for low level flow

control.

7 S1_DTR* 4 COM1 Data Terminal Ready – Indicates serial port is powered,

initialized, and ready. Used as hardware handshake with DSR for overall

readiness.

8 S1_RI* 9 COM1 Ring Indicator – Indicates external serial device is detecting a

ring condition. Used by software to initiate operations to answer and

open the communications channel.

GND 5 Ground

GND 10 Ground

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 63 64

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