參數(shù)資料
型號(hào): 5962R0722402VYC
廠商: ATMEL CORP
元件分類(lèi): 微控制器/微處理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PQFP256
封裝: QFP-256
文件頁(yè)數(shù): 94/155頁(yè)
文件大小: 4139K
代理商: 5962R0722402VYC
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AT697F PRELIMINARY INFORMATION
43
7703D–AERO–12/09
PR
ELI
MINA
R
Y
IN
FOR
M
AT
IO
N
Cache
Memories
Overview
The AT697F processor implements a Harvard architecture with separate instruction and data
buses, connected to two independent cache controllers. In order to improve the speed perfor-
mance of the cpu core, multi-set-caches are used for both instruction and data caches.
The cache replacement policy used for both instruction and data caches is based on the LRU
algorithm. The least recently used (LRU) set of the cache is replaced when new data need to be
stored in cache.
Cache mapping
Most of the main memory areas can be cached. The cacheable areas are the PROM and RAM
areas. The following table presents the caching capabilities of the processor.
Table 17.
Address Range
Area
Cache status
0x00000000 - 0x1FFFFFFF
PROM
Cached
0x20000000 - 0x3FFFFFFF
I/O
Non-cacheable
0x40000000 -0x7FFFFFFF
RAM
Cached
0x80000000 -0xFFFFFFFF
Internal
Non-cacheable
Cache Capability List
Operation
During normal operation, the processor accesses instructions and data using ASI 0x8 - 0xB as
defined in the SPARC standard.
Using the LDA/STA instructions, alternative address spaces as caches can be accessed.
ASI[3:0] are used for the mapping when ASI[7:4] have no influence on operation.
Access with ASI 0 - 3 will force a cache miss, update the cache if the data was previously
cached or allocate a new line if the data was not in the cache and the address refers to a
cacheable location.
Access to ASI 4 and 7 will force a cache miss and update the cache if the data was
previously cached.
The following table shows the ASI implementation on the AT697F.
Table 18. ASI Usage
ASI
Usage
0x0, 0x1, 0x2, 0x3
Forced cache miss (replace if cacheable)
0x4, 0x7
Forced cache miss (update on hit)
0x5
Flush instruction cache
0x6
Flush data cache
0x8, 0x9, 0xA, 0xB
Normal cached access (replace if cacheable)
0xC
Instruction cache tags
0xD
Instruction cache data
0xE
Data cache tags
0xF
Data cache data
Note:
Please refer to the SPARC v8 specification for detailed information on ASI usage.
Instruction Cache
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