r500/regs/zb_hiz_wrindex.txt

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Field Name Bits Default Description
HIZ_WRINDEX 17:2 0x0 Self-incrementing write index into the HiZ RAM.
Starting write index must start on a DWORD boundary.
Each time ZB_HIZ_DWORD is written, this index will
autoincrement. HIZ_OFFSET and HIZ_PITCH are not
used to compute read/write address to HIZ ram, when it
is accessed through WRINDEX and DWORD