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參數(shù)資料
| 型號(hào)： | TMX320DM6446ZWT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Digital Media System on-Chip |
| 中文描述： | 數(shù)字媒體系統(tǒng)芯片 |
| 文件頁(yè)數(shù)： | 9/214頁(yè) |
| 文件大小： | 1699K |
| 代理商： | TMX320DM6446ZWT |
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www.ti.com
P
2.3.2
CP15
2.3.3
MMU
2.3.4
Caches and Write Buffer
TMS320DM6446
Digital Media System on-Chip
SPRS283–DECEMBER 2005
Memory Management Unit (MMU)
Separate instruction and data Caches
Write buffer
Separate instruction and data Tightly-Coupled Memories (TCMs) [internal RAM] interfaces
Separate instruction and data AHB bus interfaces
Embedded Trace Module and Embedded Trace Buffer (ETM/ETB)
For more complete details on the ARM9, refer to the ARM926EJ-S Technical Reference Manual, available
at http://www.arm.com
The ARM926EJ-S system control coprocessor (CP15) is used to configure and control instruction and
data caches, Tightly-Coupled Memories (TCMs), Memory Management Unit (MMU), and other ARM
subsystem functions. The CP15 registers are programmed using the MRC and MCR ARM instructions,
when the ARM in a privileged mode such as supervisor or system mode.
The ARM926EJ-S MMU provides virtual memory features required by operating systems such as Linux,
WindowCE, ultron, ThreadX, etc. A single set of two level page tables stored in main memory is used to
control the address translation, permission checks and memory region attributes for both data and
instruction accesses. The MMU uses a single unified Translation Lookaside Buffer (TLB) to cache the
information held in the page tables. The MMU features are:
Standard ARM architecture v4 and v5 MMU mapping sizes, domains and access protection scheme.
Mapping sizes are:
–
1MB (sections)
–
64KB (large pages)
–
4KB (small pages)
–
1KB (tiny pages)
Access permissions for large pages and small pages can be specified separately for each quarter of
the page (subpage permissions)
Hardware page table walks
Invalidate entire TLB, using CP15 register 8
Invalidate TLB entry, selected by MVA, using CP15 register 8
Lockdown of TLB entries, using CP15 register 10
The size of the Instruction Cache is 16KB, Data cache is 8KB. Additionally, the Caches have the following
features:
Virtual index, virtual tag, and addressed using the Modified Virtual Address (MVA)
Four-way set associative, with a cache line length of eight words per line (32-bytes per line) and with
two dirty bits in the Dcache
Dcache supports write-through and write-back (or copy back) cache operation, selected by memory
region using the C and B bits in the MMU translation tables.
Critical-word first cache refilling
Cache lockdown registers enable control over which cache ways are used for allocation on a line fill,
providing a mechanism for both lockdown, and controlling cache corruption
Dcache stores the Physical Address TAG (PA TAG) corresponding to each Dcache entry in the TAG
RAM for use during the cache line write-backs, in addition to the Virtual Address TAG stored in the
TAG RAM. This means that the MMU is not involved in Dcache write-back operations, removing the
possibility of TLB misses related to the write-back address.
Device Overview
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TMX320DM6467TZUT1 | 制造商:Texas Instruments 功能描述: |
| TMX320DM6467ZUT | 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC Dig Media System-on- Chip RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| TMX320DM647ZUT720 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Digital Media Processor |
| TMX320DM647ZUT900 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Digital Media Processor |
| TMX320DM648ACUT7 | 制造商:Texas Instruments 功能描述:- Trays |
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