Ampro Corporation XTX 820 manual Infrared IrDA Port, PS/2 Keyboard, PS/2 Mouse, CTS2, DTR2

Chapter 3 Hardware

J3	Pin #	Signal	Description
Pin #	DB9
75	8	CTS2*	Clear To Send 2 – Indicates external serial device is ready to receive data.
			Used as hardware handshake with RTS2 for low level flow control.
69	4	DTR2*	Data Terminal Ready 2 – Indicates Serial port 1 is powered, initialized, and
			ready. Used as hardware handshake with DSR2 for overall readiness.
79	9	RI2*	Ring Indicator 2 – Indicates external serial device is detecting a ring
			condition. Used by software to initiate operations to answer and open the
			communications channel.
19	5	GND	Ground
20	NC	NC	Not connected

Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

Infrared (IrDA) Port

The Infrared Data Association (IrDA) port provides a two-way wireless communications port using infrared as a transmission medium at the basic level. There are two basic infrared implementations provided; the Hewlett-Packard Serial Infrared (HPSIR) and the Amplitude Shift Keyed Infrared (ASKIR) methods. HPSIR is a serial implementation of infrared developed by Hewlett-Packard. The IrDA (HPSIR and ASKIR) signals share Serial Port 2 with the modem and RS232 functions on the port. This port can be enabled/disabled and configured for HPSIR or ASKIR signals in the BIOS Setup Utility. Refer to Chapter 4, BIOS Setup Utility for more information.

The HPSIR method allows serial communication at baud rates up to 115k baud. Each word is sent serially beginning with a zero value start bit. A zero is sent when a single infrared pulse is sent at the beginning of the serial bit time. A one is sent when no infrared pulse is sent during the bit time.

The Amplitude Shift Keyed infrared (ASKIR) allows serial communication at baud rates up to 19.2k baud. Each word is sent serially beginning with a zero value start bit. A zero is sent when a 500 kHz waveform is sent for the duration of the serial bit time. A one is sent when no transmission is sent during the serial bit time.

Both of these methods require an understanding of the timing diagrams provided in the Super I/O controller chip (W83627HG) specifications available from the manufacture’s web site and referenced earlier in this manual. For more information, refer to the Winbond Electronics, Corp. chip specifications and the Infrared Data Association web site at http://www.irda.org.

NOTE	For infrared applications not covered in this brief description, refer to the
	83627HG chip specifications by Winbond Electronics, Corp.

PS/2 Keyboard

The signal lines for a PS/2 keyboard are provided through the J3 connector from the Super I/O (W83627HG). Refer to Table 3-19 for the Simplified PS/2 Keyboard Pin/Signal Descriptions.

PS/2 Mouse

The signal lines for a PS/2 mouse are provided through the J3 connector from the Super I/O (W83627HG). Refer to Table 3-19 for the Simplified PS/2 Mouse Pin/Signal Descriptions.

38 Reference Manual XTX 820