參數(shù)資料
型號(hào): HMS30C7202
廠商: HYNIX SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-bit ARM7TDMI RISC static CMOS CPU core
中文描述: 32-BIT, 82.944 MHz, RISC PROCESSOR, PBGA256
封裝: 17 X 17 MM, 1.40 MM HEIGHT, 1 MM PITCH, FBGA-256
文件頁數(shù): 42/161頁
文件大小: 973K
代理商: HMS30C7202
HMS30C7110
2003 MagnaChip Semiconductor Ltd. All Rights Reserved
Version 1.5
42
2.2.
Cache
This section describes the cache system of HMS30C7110.
2.2.1.
Architecture
The cache of HMS30C7110 has the following characteristics.
1.
4K byte unified (data + instruction)
2.
4-way set associative
3.
64 sets
4.
Write back policy
5.
Read miss line fill up
6.
8 words depth write buffer
This cache uses “write back policy” for high performance in write accesses to cacheable area. To
ensure the memory consistency between cache and main memory it supports user controllable line
flush mechanism. The 8 word-depth write-buffer is used to further boost up the performance.
The bit position 31 of address (most significant bit) determines whether the access is cacheable or
non-cacheable. Value of 0 at the 31
st
address bit (0x00000000H to 0x0fffffffH) is for cacheable area,
while 1 (0x10000000H to 0x1fffffffH) is for non-cacheable area.
The write buffer receives and keeps write accesses to cacheable/non-cacheable area and performs
actual memory accesses when the bus is idle, program flow (dependency) forces, or user forces.
Accesses to cacheable/non-cacheable area originally do not go into write buffer, i.e., directly go to
main memory. However, user can change this by programming user controllable registers.
2.2.2.
User Accessible Registers (Base = 0x1950_0000)
There is one 32bit register to control the cache and write buffer operations (offset = 0x0).
Table 2.6 Cache and Write Buffer Control Register
Address :
1950_0000
Bits
Access Default Description
31:20 RW
0x0
Reserved and should be set to 0.
19
RW
0x0
This bit controls Burst Selection.
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