Cortex-A8 R2P2.pdf - ARM Information Center

System Control CoprocessorNoteThe granularity of the dirty bits is so that two sets of dirty bits are updated for each CP15L1 DATA array write operation. A doubleword set of dirty bits are updated so that ifword 0 or word 1 is being updated, then the D-bit and D-bit parity bits are updated forboth word 0 and word 1.3.2.79 c15, BTB array operationsThe purpose of the Branch Target Buffer (BTB) array operations is to:• read the BTB array contents and write into the system debug data registers• write into the system debug data registers and into the BTB array.The BTB array operation is accessible in secure privileged modes only.Figure 3-77 shows the bit arrangement of the BTB array read operation.31 30 29 11 103 2 0ReservedAddressAddressBTBarrayAddressReservedReservedFigure 3-77 BTB array read operation formatFigure 3-78 on page 3-177 shows the bit arrangement of the BTB array write operation.3-176 Copyright © 2006-2008 ARM Limited. All rights reserved. ARM DDI 0344E