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DM365ZCES датащи(PDF) 11 Page - Texas Instruments

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номер детали DM365ZCES
подробное описание детали  Digital Media System-on-Chip (DMSoC)
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производитель  TI1 [Texas Instruments]
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DM365ZCES датащи(HTML) 11 Page - Texas Instruments

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TMS320DM365
www.ti.com
SPRS457E
– MARCH 2009 – REVISED JUNE 2011
Vector table. ARM internal ROM boot modes include NAND, MMC/SD, UART, USB, SPI, EMAC, and HPI.
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. 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.
2.3.7
Advanced High-performance Bus (AHB)
The ARM Subsystem uses the AHB port of the ARM926EJ-S to connect the ARM to the configuration bus
and the external memories. Arbiters are employed to arbitrate access to the separate D-AHB and I-AHB
by the configuration bus and the external memories bus.
2.3.8
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 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 device 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.
2.3.9
ARM Memory Mapping
The ARM memory map is shown in Table 2-3 and Table 2-4. This section describes the memories and
interfaces within the ARM's memory map.
2.3.9.1
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.
16KB ARM Internal ROM
2.3.9.2
External Memories
The ARM has access to the following External memories:
DDR2 / mDDR Synchronous DRAM
Asynchronous EMIF / OneNAND / NOR
NAND Flash
Copyright
© 2009–2011, Texas Instruments Incorporated
Device Overview
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