Rainbow Electronics W90N740 - Manual (Page 68)

W90N740
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7.4.5 Write Buffer
The W90N740 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, which 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.
Cache Control Registers Map
Register Address R/W Description Reset Value
CAHCNF 0xFFF0.2000 R/W Cache configuration register 0x0000.0000
CAHCON 0xFFF0.2004 R/W Cache control register 0x0000.0000
CAHADR 0xFFF0.2008 R/W Cache address register 0x0000.0000
CTEST0 0xFFF6.0000 R/W Cache test register 0 0x0000.0000
CTEST1 0xFFF6.0004 R Cache test register 1 0x0000.0000