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Release 1.0, 1 July 2002 F. Chapter L Address Space Identifiers 123
BSTW Control Register (ASI_C_BSTW0, ASI_C_BSTW1)
The BSTW control register designates which bit in LBSY is written through
ASI_BSTWx.
BSTW Busy Status Register (ASI_C_BSTWBUSY)
The BSTW busy status register indicates an update is made to LBSY in the SB and has
not completed yet.
Programming Note –
Supervisor software should not write to
ASI_C_BSTW
x
while ASI_C_BSTWBUSY.BUSY = 1. Otherwise, subsequent writes are ignored or a
write to wrong BST is sent to the SB.
[1] Register Name:
ASI_C_BSTW0
,
ASI_C_BSTW1
[2] ASI:
6F
16
[3] VA:
80
16
(
ASI_C_BSTW0
),
88
16
(
ASI_C_BSTW1
).
[4] RW Supervisor read/write
Bit Name RW Description
63 V RW Valid. When V = 0, BL_num and SB_BPU_num are
ignored and a write to ASI_BSTWx is discarded. When
V = 1, data in the ASI_BSTWx is written to the selected
bit in SB_BPU.
6 SB_BPU_num RW SB BPU number on the SB.
5:0 BST_num RW BST bit number in the selected SB BPU.
[1] Register Name:
ASI_C_LBSTWBUSY
[2] ASI:
6F
16
[3] VA:
C0
16
[4] RW Supervisor read
Bit Name RW Description
0 BUSY R BUSY = 1 is indicated when a write to ASI_C_BSTWx is made
but LBSY on the SB has not yet been updated.