Adlink CoreModule 745 Manual de usuario descargar pdf (Pagina 31)

Chapter 3 Hardware

CoreModule 745 Reference Manual 25

Table 3-5 describes the pin signals of the serial port 3 header, which consists of 10 pins, two rows, odd/even

(1, 2) pin sequence, and 0.079" (2mm) pitch.

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

USB Interface

The CoreModule 745 contains two root USB hubs and four functional USB ports. The ICH8-M provides the

USB function including the following features:

• Supports USB v.2.0 EHCI and USB v.1.1 UHCI

• Provides over-current detection status

• Provides a fuse on board for over current protection

Table 3-6 describes the pin signals of the USB0 and USB1 header which consists of 10 pins, in two rows,

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

Table 3-5. Serial Port 3 Interface Pin Signal Descriptions (J5)

Pin # Signal DB9 # Description

1 DCD* 1 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 DSR* 6 Data Set Ready – Indicates external serial device is powered, initialized,

and ready. Used as hardware handshake with DTR for overall readiness.

3 RXD 2 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 RTS* 7 Request To Send – Indicates serial port is ready to transmit data. Used as

hardware handshake with CTS for low level flow control.

5 TXD 3 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 CTS* 8 Clear To Send – Indicates external serial device is ready to receive data.

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

7 DTR* 4 Data Terminal Ready – Indicates serial port is powered, initialized, and

ready. Used as hardware handshake with DSR for overall readiness.

8 RI* 9 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

10 Key/NC NC Key Pin – Not connected

Table 3-6. USB0 and USB1 Interface Pin Signals (J16)

Pin # Signal Description

USB-PWR_0 USB0 Power – VCC (+5V +/-5%) power goes to the port through an

on-board fuse. Port is disabled if this input is low.

USB-PWR_1 USB1 Power – VCC (+5V +/-5%) power goes to the port through an

on-board fuse. Port is disabled if this input is low.

3 CONN_USB0_N USB0 Port Data Negative

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