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Intel
®
IXP42X product line and IXC1100 control plane processors—Overview of Product Line
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
DM September 2006
36 Order Number: 252480-006US
The IXP42X product line and IXC1100 control plane processors have been equipped to
efficiently handle audio processing through the support of 16-bit data types and 16-bit
operations. These audio-coding enhancements center around multiply and accumulate
operations which accelerate many of the audio filter operations.
2.1.1 Intel XScale
®
Processor Overview
Figure 6 shows the major functional blocks of the Intel XScale processor. This section
gives brief, high-level overviews of these blocks.
Note: The Power Management Control feature was not implemented in the IXP42X product
line and IXC1100 control plane processors.
2.1.1.1 ARM
*
Compatibility
ARM
*
Version 5 Architecture added floating point instructions to ARM Version 4. The
Intel XScale processor implements the integer instruction set architecture of ARM V5,
but does not provide hardware support of the floating point instructions.
Intel XScale processor provides the Thumb* instruction set (ARM V5T) and the ARM
V5E DSP extensions.
Backward compatibility with ARM products is maintained for user-mode applications.
Operating systems may require modifications to match the specific hardware features
of the IXP42X product line and IXC1100 control plane processors and to take
advantage of added performance enhancements.
2.1.1.2 Multiply/Accumulate (MAC)
The MAC unit supports early termination of multiplies/accumulates in two cycles and
can sustain a throughput of a MAC operation every cycle. Several architectural
enhancements were made to the MAC to support audio coding algorithms, which
include a 40-bit accumulator and support for 16-bit packed data.
Figure 6. Intel XScale
®
Technology Architecture Features
Write Buffer
• 8 entries
• Full coalescing
Fill
Buffer
• 4 - 8 entries
Instruction Cache
• 32K or 16K bytes
• 32 ways
• Lockable by line
IMMU
• 32 entry TLB
• Fully associative
• Lockable by entry
DMMU
• 32 entry TLB
• Fully Associative
• Lockable by entry
JTAG
Debug
• Hardware Breakpoints
• Branch History Table
Branch Target
Buffer
• 128 entries
MAC
• Single Cycle
Throughput (16*32)
• 16-bit SIMD
• 40 bit Accumulator
Data Cache
• 32K or 16K bytes
• 32 ways
• wr-back or
wr-through
• Hit under
miss
Data RAM
• 28K or 12K
bytes
• Re-map of data
cache
Power
Mgnt
Ctrl
Mini-
Data
Cache
• 2K or 1K
bytes
• 2 ways
Performance
Monitoring