參數(shù)資料
型號(hào): M32000D3FP
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 66.6 MHz, RISC MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-100
文件頁數(shù): 128/155頁
文件大?。?/td> 1340K
代理商: M32000D3FP
5-8
M32000D3FP User's Manual
INTERNAL MEMORY AND MEMORY CONTROLLER
5.4 Internal memory configuration and cache mode
Fig. 5.4.1 Internal instruction/data cache mode
128
external bus
(16 bits)
16
external bus
interface
M32000D3FP
128
instruction/
data cache
DRAM
BIU
CPU
5.4 Internal memory configuration and cache mode
The M32000D3FP's internal memory system configuration can be selected from the following 3 modes by
the cache control register of the internal memory controller.
5.4.1 Internal instruction/data cache mode
When the internal instruction/data cache mode is selected, the cache memory functions as a cache for both
instruction and data from the internal DRAM, and caches all bus access to the DRAM. This mode is for
a system which uses the internal DRAM as main memory. Transfer between the M32R CPU, cache
memory and internal DRAM is always carried out in blocks of 128 bits.
When the M32R CPU access destination is an external space, data transfer between the M32R CPU and
the external device is carried out via the bus interface unit (BIU). The BIU has a 128-bit data buffer which
converts the bus width between the 128-bit bus in the M32000D3FP and the external bus. Caching is not
applicable in this case of data transfer.
When accessing the internal DRAM from an external bus master, and a cache hit occurs (the accessed
data is inside the cache), data transfer between the cache memory and the external bus via the BIU is
carried out. When a cache miss occurs, (the accessed data is not inside the cache) data transfer is carried
out between the internal DRAM and the external bus via the BIU without cache replacement.
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