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AM3894CCYG120 Scheda tecnica(PDF) 10 Page - Texas Instruments

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Il numero della parte AM3894CCYG120
Spiegazioni elettronici  AM389x Sitara ARM Processors
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AM3894
AM3892
SPRS681E – OCTOBER 2010 – REVISED JULY 2012
www.ti.com
2.3.1
ARM Cortex-A8 RISC Processor
The ARM Cortex-A8 subsystem integrates the ARM Cortex-A8 processor. The ARM Cortex-A8 processor
is a member of ARM Cortex family of general-purpose processors. This processor is targeted at multi-
tasking applications where full memory management, high performance, low die size, and low power are
all important. The ARM Cortex-A8 processor supports the ARM debug architecture and includes logic to
assist in both hardware and software debug. The ARM Cortex-A8 processor has a Harvard architecture
and provides a complete high-performance subsystem, including:
ARM Cortex-A8 integer core
Superscalar ARMv7 instruction set
Thumb-2 instruction set
Jazelle RCT acceleration
CP14 debug coprocessor
CP15 system control coprocessor
NEON 64-/128-bit hybrid SIMD engine for multimedia
Enhanced memory management unit (MMU)
Separate level-1 instruction and data caches
Integrated level-2 cache
128-bit interconnect to system memories and peripherals
Embedded trace module (ETM).
2.3.2
Embedded Trace Module (ETM)
To support real-time trace, the ARM Cortex-A8 processor provides an interface to enable connection of an
embedded trace module (ETM). The ETM consists of two parts:
The Trace port provides real-time trace capability for the ARM Cortex-A8.
Triggering facilities provide trigger resources, which include address and data comparators, counter,
and sequencers.
The ARM Cortex-A8 trace port is connected to the system-level embedded trace buffer (ETB). The ETB
has a 32KB buffer memory. ETB enabled debug tools are required to read/interpret the captured trace
data.
For more details on the ETB, see Section 8.4.2.
2.3.3
ARM Cortex-A8 Interrupt Controller (AINTC)
The ARM Cortex-A8 subsystem contains an interrupt controller (AINTC) that prioritizes all service requests
from the system peripherals and generates either IRQ or FIQ to the ARM Cortex-A8 processor. For more
details on the AINTC, see Section 7.4.
2.3.4
System Interconnect
The ARM Cortex-A8 processor in connected through the arbiter to both an L3 interconnect port and a
DMM port. The DMM port is 128-bits wide and provides the ARM Cortex-A8 direct access to the DDR
memories, while the L3 interconnect port is 64-bits wide and provides access to the remaining device
modules.
10
Device Overview
Copyright © 2010–2012, Texas Instruments Incorporated
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