PPC7A Product Manual
General Description
2-6
1
st
Edition
PCI Expansion Bus
Two PMC slots are provided as standard on the PPC7A. These PCI slots are 64 bits wide and run at
66 MHz. If a PCI card is fitted that is not capable of running at 66 MHz, then the PPC7A will reduce the
frequency to 33 MHz for both PCI slots.
For those configurations requiring additional PCI functionality, the PMC to PCI Bridge card (PMCPCI)
bridges the on-board PCI bus out via the P0 connector, allowing use of a range of P0 PMC carriers, or
interfacing the PPC7A directly to Radstone’s range of SHARC-based DSP boards.
To connect the PPC7A to P0-based carrier cards such as the P0CC1, a series of P0 add-on backplanes
are available. These are PCBs for attaching to a system backplane that has J0 connectors fitted. The
following variants are available:
V
ARIANT
P
CI
B
ACKPLANE
S
LOTS
M
ASTER
S
LOTS
P0
CC
1 S
LOTS
P0BP1-502
2
1
1
P0BP1-503
3
1
2
P0BP1-504
4
1
3
P0BP1-505
5
1
4
The P0BP1 backplane must be soldered onto the J0 system backplane, and can be used with either
type A or type B J0. These backplanes are intended to have a host SBC with PMCPCI card plugged into
the master slot, which is the left-most slot of the P0 PCI backplane. For further information about P0
backplanes, please contact Radstone directly or talk to your nearest Sales Office.
Memory
System RAM
Between 64 and 512 Mbytes (using 256 Mbit devices) of system memory is available. The SDRAM is
configured as two banks, with the GT64260 directly controlling both. The GT64260 data protection is by
two methods:
•
Error Correction Coding - capable of detecting all single bit, double bit and nibble errors, and
correcting single bit errors
•
Parity - aids the detection of errors, but offers no correction
System FLASH
Up to 8 Mbytes of System FLASH is provided. This holds initialisation and operating system boot
routines. The System FLASH is configured as a 32-bit wide device.
User FLASH
Between 24 and 248 Mbytes of User FLASH may be fitted. The data width is configured as a 32-bit
wide device.
NOVRAM
For maintenance of general system parameters, such as boot options, Ethernet addresses and VME
configuration, 32 Kbytes of on-board NOVRAM provides a convenient non-volatile storage area.
Level 2 or 3 Cache
The PPC7A provides 2 Mbytes of L2 or L3 (with PowerPC 745x) cache, connected to a separate cache
bus. By using this private cache bus, the cache traffic does not consume memory bus bandwidth. The
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