OMAP-L137
SPRS563G – SEPTEMBER 2008 – REVISED JUNE 2014
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3.4.2
DSP Memory Mapping
The DSP memory map is shown in
Section 3.5
.
By default the DSP also has access to most on and off chip memory areas, with the exception of the ARM
RAM, ROM, and AINTC interrupt controller. The DSP also boots first, and must release the ARM from
reset before the ARM can execute any code.
Additionally, the DSP megamodule includes the capability to limit access to its internal memories through
its SDMA port; without needing an external MPU unit.
3.4.2.1
ARM Internal Memories
The DSP does not have access to the ARM internal memory.
3.4.2.2
External Memories
The DSP has access to the following External memories:
•
Asynchronous EMIF / SDRAM / NAND / NOR Flash (EMIFA)
•
SDRAM (EMIFB)
3.4.2.3
DSP Internal Memories
The DSP has access to the following DSP memories:
•
L2 RAM
•
L1P RAM
•
L1D RAM
3.4.2.4
C674x CPU
The C674x core uses a two-level cache-based architecture. The Level 1 Program cache (L1P) is 32 KB
direct mapped cache and the Level 1 Data cache (L1D) is 32 KB 2-way set associated cache. The Level 2
memory/cache (L2) consists of a 256 KB memory space that is shared between program and data space.
L2 memory can be configured as mapped memory, cache, or a combination of both.
Table 3-2
shows a memory map of the C674x CPU cache registers for the device.
Table 3-2. C674x Cache Registers
BYTE ADDRESS
ACRONYM
REGISTER DESCRIPTION
L2 Cache configuration register (See the Technical Reference Manual
0x0184 0000
L2CFG
SPRUH92
for the reset configuration)
L1P Size Cache configuration register (See the Technical Reference
0x0184 0020
L1PCFG
Manual
SPRUH92
for the reset configuration)
0x0184 0024
L1PCC
L1P Freeze Mode Cache configuration register
L1D Size Cache configuration register (See the Technical Reference
0x0184 0040
L1DCFG
Manual
SPRUH92
for the reset configuration)
0x0184 0044
L1DCC
L1D Freeze Mode Cache configuration register
0x0184 0048 - 0x0184 0FFC
-
Reserved
0x0184 1000
EDMAWEIGHT
L2 EDMA access control register
0x0184 1004 - 0x0184 1FFC
-
Reserved
0x0184 2000
L2ALLOC0
L2 allocation register 0
0x0184 2004
L2ALLOC1
L2 allocation register 1
0x0184 2008
L2ALLOC2
L2 allocation register 2
0x0184 200C
L2ALLOC3
L2 allocation register 3
0x0184 2010 - 0x0184 3FFF
-
Reserved
0x0184 4000
L2WBAR
L2 writeback base address register
0x0184 4004
L2WWC
L2 writeback word count register
16
Device Overview
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