3.6.2 PowerPC Interfaces
The PowerPC 405 processor provides a set of interfaces that support the attachment of
Xilinx Cores and user logic. The following are the list of interfaces that are available in
the Virtex-ii Pro device family.
a) Processor local bus interface (PLB)
b) Device control register interface(DCR)
c) Clock and power management interface
d) JTAG port interface
e) On-chip interrupt controller interface
f) On-chip memory controller interface
The PowerPC interfaces used in the design are described below:
II JTAG Port: The JTAG port interface supports the attachment of external tools. The
JTAG interface was used to download the firmware for the Xilinx ML321.
2)
Processor Local Bus: The processor local bus (PLB) interface provides a 32-bit
address and three 64-bit data buses attached to the instruction-cache and data-cache units.
The on-chip processor local bus (OPB) provides a 32-bit address bus and a 32-bit data
bus. PLB is faster than OPB, but consumes more FPGA resources. The
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