BL702/704/706 Reference Manual
7.2 L1C main features
• 4-way Set-Associative mapping
• Variable cache size
• Connect to TCM address space, can easily configure L1C space as TCM space
• Support cache performance statistics
7.3 L1C function description
7.3.1 Mutual conversion between TCM and Cache RAM resources
In order to increase memory usage efficiency, it is supported to adjust all or part of the Cache’s 16K RAM to TCM
space, so that users can adjust the memory usage and efficiency according to the actual situation. The maximum
Cache can be set to 16K, divided into 4 ways, each way is 4K, and the unit of adjustment is 1 way, which is 4K. The
default size of ITCM is 16K. Set by WayDisable. The actual space size of Cache and ITCM can be flexibly adjusted.
Table 7.1: WayDisable settings
WayDisable Cache ITCM
none 16K 0K
one way 12K 4K
two way 8K 8K
three way 4K 12K
four way 0K 16K
7.3.2 Cache
The unit of each line buffer is 32 bytes, and the 4-way associative mapping cache is used. The application architecture
is as follows:
BL702/704/706 Reference Manual 159/ 375
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