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VCE6467TZUTL1 Datasheet(PDF) 11 Page - Texas Instruments

Part # VCE6467TZUTL1
Description  VCE6467T, AVCE6467T Digital Media System-on-Chip
Download  352 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

VCE6467TZUTL1 Datasheet(HTML) 11 Page - Texas Instruments

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VCE6467T, AVCE6467T
www.ti.com
SPRS690 – MARCH 2011
2.3.5
Tightly Coupled Memory (TCM)
ARM internal RAM is provided for storing real-time and performance-critical code/data and the Interrupt
Vector table. ARM internal ROM enables non-EMIFA boot options, such as NAND and UART. The RAM
and ROM memories interfaced to the ARM926EJ-S via the tightly coupled memory interface that provides
for separate instruction and data bus connections. Since the ARM TCM does not allow instructions on the
D-TCM bus or data on the I-TCM bus, an arbiter is included so that both data and instructions can be
stored in the internal RAM/ROM. The arbiter also allows accesses to the RAM/ROM from extra-ARM
sources (e.g., EDMA or other masters). The ARM926EJ-S has built-in DMA support for direct accesses to
the ARM internal memory from a non-ARM master. Because of the time-critical nature of the TCM link to
the ARM internal memory, all accesses from non-ARM devices are treated as DMA transfers.
Instruction and Data accesses are differentiated via accessing different memory map regions, with the
instruction region from 0x0000 through 0x7FFF and data from 0x10000 through 0x17FFF. The instruction
region at 0x0000 and data region at 0x10000 map to the same physical 32-KB TCM RAM. Placing the
instruction region at 0x0000 is necessary to allow the ARM Interrupt Vector table to be placed at 0x0000,
as required by the ARM architecture. The internal 32-KB RAM is split into two physical banks of 16KB
each, which allows simultaneous instruction and data accesses to be accomplished if the code and data
are in separate banks.
2.3.6
Advanced High-Performance Bus (AHB)
The ARM Subsystem uses the AHB port of the ARM926EJ-S to connect the ARM to the Config bus and
the external memories. Arbiters are employed to arbitrate access to the separate D-AHB and I-AHB by the
Config Bus and the external memories bus.
2.3.7
Embedded Trace Macrocell (ETM) and Embedded Trace Buffer (ETB)
To support real-time trace, the ARM926EJ-S processor provides an interface to enable connection of an
Embedded Trace Macrocell (ETM). The ARM926ES-J Subsystem in the VCE6467T also includes the
Embedded Trace Buffer (ETB). The ETM consists of two parts:
Trace Port provides real-time trace capability for the ARM9.
Triggering facilities provide trigger resources, which include address and data comparators, counter,
and sequencers.
The VCE6467T trace port is not pinned out and is instead only connected to the Embedded Trace Buffer.
The ETB has a 4KB buffer memory. ETB enabled debug tools are required to read/interpret the captured
trace data.
2.3.8
ARM Memory Mapping
The ARM memory map is shown in Section 2.6, Memory Map Summary of this document. The ARM has
access to memories shown in the following sections.
2.3.8.1
ARM Internal Memories
The ARM has access to the following ARM internal memories:
32KB ARM Internal RAM on TCM interface, logically separated into two 16KB pages to allow
simultaneous access on any given cycle if there are separate accesses for code (I-TCM bus) and data
(D-TCM) to the different memory regions.
8KB ARM Internal ROM
2.3.8.2
External Memories
The ARM has access to the following external memories:
DDR2 Synchronous DRAM
Asynchronous EMIF / NOR Flash / NAND Flash
ATA
Copyright © 2011, Texas Instruments Incorporated
Device Overview
11
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