参数资料
型号: MC68EC060RC50
厂商: Freescale Semiconductor
文件页数: 20/128页
文件大小: 0K
描述: IC MPU 32BIT 50MHZ 206-PGA
标准包装: 10
系列: M680x0
处理器类型: M680x0 32-位
速度: 50MHz
电压: 3.3V
安装类型: 通孔
封装/外壳: 206-BEPGA
供应商设备封装: 206-PGA(47.25x47.25)
包装: 托盘
Caches
MOTOROLA
M68060 USER’S MANUAL
5-17
5.12.2 Data Cache
The integer unit uses the data cache to store operand data as it requires or generates the
data. The data cache supports a line-based protocol allowing individual cache lines to be in
one of three states: invalid, valid, or dirty. To maintain coherency with memory, the data
cache supports both writethrough and copyback modes, specified by the CM field for the
page.
Table 5-2. Instruction Cache Line State Transitions
Cache Operation
Current State
Invalid Cases
Valid Cases
IPU Read Miss
I1 Read line from memory; supply data to
IPU and update cache; go to valid state. V1
Read line from memory; supply data to
IPU and update cache (replacing old
line); remain in current state.
IPU Read Hit
I2 Not Possible.
V2 Suppply data to IPU; remain in current
state.
Cache Invalidate or Push
(CINV or CPUSH)
I3 No action; remain in current state.
V3 No action; go to invalid state.
Alternate Master Snoop Hit
(Read or Write)
I4 Not possible.
V4 No action; go to invalid state.
Alternate Master Snoop Miss I5 Not possible.
V5 No action; remain in current state.
TCI Asserted on Read Miss
(during the First Access)
I6 Read line for memory; Supply data to
the IPU; remain in current state.
V6 Not Possible.
Figure 5-6. Instruction Cache Line State Diagram
INVALID
VALID
I1—IPU READ MISS
I3—CINV/CPUSH
V1—IPU READ MISS
V2—IPU READ HIT
V5—SNOOP MISS
V3—CINV/CPUSH
V4—SNOOP READ/WRITE HIT
I6—TCI ASSERTED
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