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Functional Description
CPB902
C P B 9 0 2 U s e r M a n u a l
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4.3.9
USB Interface
The module is equipped with two USB 1.1 host ports. Each channel has separate power control
circuit. These ports are available via P3 USB-A duplex connector at the edge of the board.
4.3.10
Fast
Ethernet
Interface
The CPB902 has two 10Base-TX/100Base-TX Ethernet channels provided by two National
Semiconductor DP83815 controllers. They are available via two RJ45 (P1 and P2) connectors at
the edge of the board (see
). Their pinout conforms to IEEE 802.3 Ethernet specification.
4.3.11 Serial
Ports
The CPB902 is furnished with six serial ports. COM1 and COM2 ports have standard PC AT base
addresses. The base address of COM3 – COM6 group of ports can be changed.
COM1 is routed to J4 IDC10 connector (2.54 mm pitch). It has only three lines (RXD, TXD and
GND) and is intended for console operation and file exchange. To connect this port to a remote PC
a null-modem cable is needed. COM2 is a full function RS232 port and is routed to DB9 J3
connector. Maximum transfer rate for COM1 and COM2 ports is 115.2 Kb/s. They are fully
compatible with UART16550.
COM3 – COM6 ports allow data transmission rates up to 921.6 Kb/s and support
RS-232/RS-422/RS-485 interfaces. The transmission clock frequency and operation modes for
these ports are set in BIOS Setup, see
. These four ports are routed to IDC10 on-board
connectors (J5, J7, J9 and J11 correspond to COM3, COM4, COM5 and COM6 respectively).
IDC10 connector pins numbering is shown on figure below.
Figure 4.18:
IDC10 Pins Numbering
The following table gives information on COM ports pin assignments for all serial ports and
different interfaces. Empty cells (dashes in cells) mean that in the current mode the pins are not
used, but it is not allowed to connect any signals to them.