Figure 6-1 Write Buffer Fifo Content Example - ARM ARM966E-S Technical Reference Manual

Bus Interface Unit
6.2.2 Draining write data from the write buffer
6-4
STMIA r13!,{r2-r4} ; store three registers to the stack
STRB r5,[r6] ; store byte
STMIA r13!,{r3-r4} ; store two registers to the stack
STR r7,[r2] ; single store
The write buffer can drain naturally where AHB writes occur whenever data is
committed to the FIFO. The core is only stalled, if the write buffer overflows. However,
there are times when a complete drain of the write buffer is enforced.
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From ARM9E-S CLK domain
Data r7
Address r2
Data r4
Data r3
Address r13
Data r5
Address r6
Data r4
Data r3
Data r2
Address r13
To AHB HCLK domain

Figure 6-1 Write buffer FIFO content example

Address and size marker
Sequentiality marker
A
Word
S
A
Word
A
Byte
S
S
A
Word
To BIU control
ARM DDI 0186A