Motorola PRPMC800A/IH5 Manuale Utente
3 Functional Description
PrPMC800/800ET Processor PMC Module Installation and Use (PrPMC800A/IH5)
19
Arbitration
The Harrier ASIC contains arbiters for the PPC bus (60x bus mode only) and the PCI bus. The
PPC arbiter is used to arbitrate between the processor and the Harrier PPC bus master for
ownership of the PPC bus. The processor is connected to the Harrier arbiter
CPU0_REQ/CPU0_GNT signal pair (XARB3/XARB0).
PPC arbiter is used to arbitrate between the processor and the Harrier PPC bus master for
ownership of the PPC bus. The processor is connected to the Harrier arbiter
CPU0_REQ/CPU0_GNT signal pair (XARB3/XARB0).
The Harrier PCI bus arbiter is disabled in the standard board configuration. Per the VITA-32
199x Processor PMC Standard, the PCI bus arbitration must be provided by the baseboard.
199x Processor PMC Standard, the PCI bus arbitration must be provided by the baseboard.
Flash Memory
The PrPMC800/800ET supports two banks of flash memory. Bank A is onboard flash, while
bank B is optional flash located on the host board and accessed through the PMC P14
connector.
bank B is optional flash located on the host board and accessed through the PMC P14
connector.
XAD[9]
BankB_SEL
x
Xport channel 0
reset vector source
reset vector source
Enable/Disable (1/0) Xport
channel 0 (flash bank A) as
reset vector source,
depending on state of
baseboard jumper.
channel 0 (flash bank A) as
reset vector source,
depending on state of
baseboard jumper.
XAD
[8:7]
[8:7]
Fixed
11
Xport channel 1 data
width
XCSR.XPAT1.DW
width
XCSR.XPAT1.DW
Set Xport channel 1 (flash
bank B) to 16-bit width, Hawk
addressing mode.
bank B) to 16-bit width, Hawk
addressing mode.
XAD[6]
Fixed
1
Xport channel 1
reset vector source
reset vector source
Enable Xport channel 1 (flash
bank B) as reset vector
source if Xport channel 0 is
disabled.
bank B) as reset vector
source if Xport channel 0 is
disabled.
XAD
[5:4]
[5:4]
Fixed
xx
Xport channel 2 data
width
XCSR.XPAT2.DW
width
XCSR.XPAT2.DW
Unused.
XAD[3]
Fixed
0
Xport channel 2
reset vector source
reset vector source
Disable Xport channel 2 as
Reset Vector source
Reset Vector source
XAD
[2:1]
[2:1]
Fixed
xx
Xport channel 3 data
width
XCSR.XPAT2.DW
width
XCSR.XPAT2.DW
Unused.
XAD[0]
Fixed
0
Xport Channel 3
Reset Vector Source
Reset Vector Source
Disable Xport channel 3 as
Reset Vector source
Reset Vector source
Table 3-2. Harrier Power-Up Configuration Settings (continued)
Harrier
XAD
Bus
Signal
XAD
Bus
Signal
Select
Option
Option
Default
Power-
Up
Setting
Power-
Up
Setting
Function/
Register Bit
Register Bit
Description