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FWIXP422BB Datasheet(PDF) 26 Page - Intel Corporation

Part # FWIXP422BB
Description  Intel짰 IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

FWIXP422BB Datasheet(HTML) 26 Page - Intel Corporation

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Intel® IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
March 2005
Datasheet
26
Document Number: 252479, Revision: 005
2.1.14
Timers
The IXP42X product line and IXC1100 control plane processors consists of four internal timers
operating at 66.66 MHz (which is 2 * OSC_IN input pin.) to allow task scheduling and prevent
software lock-ups. The device has four 32-bit counters:
2.1.15
AHB Queue Manager
The AHB Queue Manager (AQM) provides queue functionality for various internal blocks. It
maintains the queues as circular buffers in an embedded 8KB SRAM. It also implements the status
flags and pointers required for each queue.
The AQM manages 64 independent queues. Each queue is configurable for buffer and entry size.
Additionally status flags are maintained for each queue.
The AQM interfaces include an Advanced High-performance Bus (AHB) interface to the NPEs
and Intel XScale core (or any other AHB bus master), a Flag Bus interface, an event bus (to the
NPE condition select logic) and two interrupts to the Intel XScale core. The AHB interface is used
for configuration of the AQM and provides access to queues, queue status and SRAM. Individual
queue status for queues 0-31 is communicated to the NPEs via the flag bus. Combined queue status
for queues 32-63 are communicated to the NPEs via the event bus. The two interrupts, one for
queues 0-31 and one for queues 32-63, provide status interrupts to the Intel XScale core.
2.2
Intel XScale® Core
The Intel XScale® Core technology is compliant with the ARM* Version 5TE instruction-set
architecture (ISA). The Intel XScale core — shown in Figure 6 — is designed with Intel 0.18-µ
production semiconductor process technology. This process technology enables the Intel XScale
core to operate over a wide speed and power range, producing industry-leading mW/MIPS
performance.
Intel XScale core features include:
Seven/eight-stage super-pipeline promotes high-speed, efficient core performance
128-entry branch target buffer keeps pipeline filled with statistically correct branch choices
32-entry instruction memory-management unit for logical-to-physical address translation,
access permissions, I-cache attributes
32-entry data-memory management unit for logical-to-physical address translation, access
permissions, D-cache attributes
32-Kbyte instruction cache can hold entire programs, preventing core stalls caused by multi-
cycle memory accesses
32-Kbyte data cache reduces core stalls caused by multi-cycle memory accesses
2-Kbyte mini-data cache for frequently changing data streams avoids “thrashing” of the D-
cache
Four-entry fill-and-pend buffers to promote core efficiency by allowing “hit-under-miss”
operation with data caches
Watch-Dog Timer
Timestamp Timer
Two general-purpose timers


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