Applying Power
http://www.motorola.com/computer/literature 2-5
2
10/100BaseT Port
The RJ-45 port on the front panel of the MVME240x labeled 10/100 BASET
supplies the Ethernet LAN 10BaseT/100Base TX interface, implemented
with a DEC 21140/21143 device.
Similarly, the Universe ASIC supplies an input signal and a control bit to
initiate a local reset operation. By setting a control bit, software can
maintain a board in a reset state, disabling a faulty board from participating
in normal system operation. The local reset driver is enabled even when
the Universe ASIC is not system controller. Local resets may be generated
by the
RST switch, a power-up reset, a watchdog timeout, a VMEbus
SYSRESET*, or a control bit in the MISC_CTL register.
DEBUG Port
The RJ-45 port labeled DEBUG on the front panel of the MVME240x
supplies the MVME240x serial communications interface, implemented
via a UART PC16550 controller chip from National Semiconductor. It is
asynchronous only. This serial port is configured for EIA-232-D DTE, as
shown in Figure 2-2.
The
DEBUG port may be used for connecting a terminal to the MVME240x
to serve as the firmware console for the factory installed debugger,
PPCBug. The port is configured as follows:
❏ 8 bits per character
❏ 1 stop bit per character
❏ Parity disabled (no parity)
❏ Baud rate = 9600 baud (default baud rate at power-up)
After power-up, the baud rate of the
DEBUG port can be reconfigured by
using the debugger’s Port Format (PF) command. Refer to Chapter 5,
PPCBug and Chapter 6, Environment Modification for information about
the PPCBug.
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