BajaPPC-750 User's Manual - Emerson Network Power

BajaPPC-750 Circuit Board 2-13
2.2.4 Reset/Interrupt Switch
2.2.5 LED
P4 P4 is an RJ45 connector for the front panel serial port A (standard
configuration only). See Section 8.3.4 for pin assignments.
J1x, J2x J1x (J11, J12, J14) and J2x (J21, J22, J24) are the two sets of PMC
module connectors. Details and pin assignments are in Chapter 5.
HDR1 HDR1 is a 16-pin JTAG\COP header that allows for boundaryscan
testing of the PowerPC CPU and the BajaPPC-750. See
Section 3.7 for pin assignments.
HDR2 HDR2 allows for PLD programming (factory use only).
HDR3 HDR3 is a 14-pin header located on the front of the circuit board
to accommodate EIA-232 communications from serial port B. See
Section 8.3.4 for pin assignments.
HDR4 HDR4 is a 16-pin debug header that allows additional access to
various PowerPC test signals. See Section 3.8 for pin assignments.
This momentary two-position toggle switch can reset the BajaPPC-750 or provide
a level 6 interrupt to the CPU. It is located between serial port connector P4 and
the LED on the front panel.
The interrupt position on this switch may be used as a user-defined debugging
tool. To determine the status of the interrupt switch, read bit zero of the 32-bit
interrupt status register at FF9A,0070 16 ; a one indicates a switch interrupt. To clear
the interrupt, write a one to the 8-bit register at FF9E,0000 16.
The BajaPPC-750 has a seven-segment LED on the front panel. The control register
for this LED is located in a PLD at FF98,0000 16 . Each bit of this register controls
a particular segment of the seven-segment display. To turn a segment on,
write a one to its control bit. At power-up or after a system reset, all segments are
off.
The segments are connected to data bits DH0–DH7 on the CPU as follows:
Table 2-2. LED Segment Vector Assignments
Data Bit Segment Data Bit Segment
DH0 f DH4 c
DH1 g DH5 b
DH2 e DH6 a
DH3 d DH7 decimal point
0002M621-15
e
a
f g
d
b
c
decimal point