Computer Hardware User Manual

3 Functional Description
PrPMC800/800ET Processor PMC Module Installation and Use (PrPMC800A/IH5)
17
Harrier Power-Up Configuration
The Harrier ASIC XAD30-XAD0 pins provide configuration information for Harrier at power-up
reset time. The following table lists the default power-up reset state of these pins for the
PrPMC800/800ET module. The Select Option column indicates whether the power-up setting
can be changed by jumper, or if the setting is fixed and cannot be changed. The Default Power-
Up Setting column indicates the default values for the standard PrPMC800/800ET product.
Default settings for jumper options indicate power-up values with jumpers not installed.
Table 3-2. Harrier Power-Up Configuration Settings
Harrier
XAD
Bus
Signal
Select
Option
Default
Power-
Up
Setting
Function/
Register Bit
Description
XAD[30] Jumper J2
pins 15-16
1 Hawk data mode
XCSR.XPGC.HDM
Enable/Disable (1/0) Hawk
16-bit data ordering mode for
Xports configured for Hawk
addressing mode. Xport 1
(flash bank B) is configured
for Hawk compatibility mode.
If disabled, use Harrier byte
ordering mode.
XAD[29] Fixed 0 UART clock select Select external clock source
for UART.
XAD[28] Jumper J2
pins 9-10
0PCI slave
configuration holdoff
XCSR.BPCS.CSH
Enable/disable (1/0)
configuration space hold off. If
enabled, accesses to the PCI
configuration space from
another PCI master results in
a disconnect retry. Local
PrPMC800/800ET software
must clear this register bit to
enable access after inbound
address and attribute fields
have been set.
XAD[27] Fixed 0 PCI slave
configuration mask
XCSR.BPCS.CSM
All of Harrier’s PCI
configuration registers are
visible from PCI space.
XAD[26] Jumper J2
pins11-12
0 Processor holdoff
XCSR.BXCS
Enable/disable (1/0)
processor hold off at power-
up. If enabled, processor is
held in reset.
XAD[25] Fixed 0 SDRAM external
register
XCSR.SDTC.SDER
There are no external buffers
in series with the BAx, RAx,
WE, RAS or CAS signals.
XAD[24] Fixed 1 Response to
unmapped address-
only cycles
XCSR.GCSR.AOAO
Harrier responds to
unmapped address only
cycles.