User`s manual

20
Pushing this button has the exact same effect as an assertion of PRST# on the CPCI bus.
The system is forced into a hard-reset state whenever this button is pushed or PRST# is
asserted. Releasing this button asserts PRST# which resets the HARP performs a cold reboot.
All PCI reset requirements on RST# are satisfied when the PRST# signal is asserted.
Switches
There are two sets of DIP (dual in-line parallel) switches on Key West. Each set of DIP
switches contains four switches. The first switch, S1, is requred by the Microsoft HARP
specification and determines the operation of the HARP at power-on/reset time. The second set
of switches, S2, is used by the monitor to select self-test functions. Both switches are readable
by the processor.
S1
ON
OFF
Figure 1 Switch Placement
Switch 1-1 is located under the dot, switch 1-2 is to the right of that, and switch 3 is to the right
of that, and switch 4 is farthest to the right. The switch is considered on when it is pulled up
towards the dot and off when it is pulled down.
Table 1: Switch S1 Settings
S1-1 S1-2 S1-3 S1-4 Function
ON X X X Code executes from the boot PROM
following reset, and communication is
over the debug serial port.
OFF ON X X Code starts executing from system
Flash after reset. The debug serial port
is used for debug communication.
OFF
OFF X X Code starts executing from system
Flash after reset. The debug Ethernet
port is used for debug communication.
X X ON X The block write protection for the
system Flash is enabled. Protected
blocks cannot be written.
X X OFF X The block write protection for the
system Flash is disabled. Protected
blocks can be written.
X X X ON Bootloader will read switch, download
image and jump directly to image
X X X OFF Bootloader will read switch go into
monitor mode over Debug Serial Port
link
Debug Serial Port
A serial port on the SH7709A/7729 processor is used as the debut RS-232 port. This port is
available externally on the front panel as a DB9 connector.
The default baud rate of this port is 38.4 kbps. The port uses a male DB9 connector, identical
in pin-out to a standard PC.