Motorola PrPMC800/800ET Processor PMC Module User Manual

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 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
0
PCI  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.