W90N745CD/W90N745CDG
The unlock all operation is used to unlock the whole D-Cache. This operation is performed on all cache
lines. In case a line is locked, it is unlocked and starts to operate as regular valid cache line. In case a
line is not locked or if it is invalid, no operation is performed. To unlock the whole cache, set the ULKA
and DCAH bits.
6.4.5 Write Buffer
The W90N745 provides a write buffer to improve system performance. The write buffer can buffer up to
eight words of data. The write buffer may be enabled or be disabled via the WRBEN bit in the CAHCNF
register, and the buffer is disabled and flushed on reset.
Drain write buffer
To force data, this is in write buffer, to be written to external main memory. This operation is useful in real
time applications where the processor needs to be sure that a write to a peripheral has completed before
program execution continues.
To perform this command, you can set the DRWB and DCAH bits in CAHCON register.
6.4.6 Cache Control Registers Map
REGISTER
ADDRESS
R/W
DESCRIPTION
RESET VALUE
CAHCNF
R/W Cache configuration register
R/W Cache control register
R/W Cache address register
R/W Cache test register 0
0x0000_0000
0xFFF0_2000
0xFFF0_2004
0xFFF0_2008
CAHCON
CAHADR
CTEST0
CTEST1
0x0000_0000
0x0000_0000
0x0000_0000
0x0000_0000
0xFFF6_0000
0xFFF6_0004
R
Cache test register 1
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