47
BVME4000/6000
Copyright
1993,1995,1998,2001 BVM Ltd.
7.10.6 Address Control Registers
Slave accesses are controlled by eight byte wide registers. All registers are write only.
Address
Register
D7
D6
D5
D4
D3
D2
D1
D0
FF400003
A32VBA
A31cmp
A30cmp
A29cmp
A28cmp
A27cmp
A26cmp
A25cmp
A24cmp
FF410003
A32MSK
A31msk
A30msk
A29msk
A28msk
A27msk
A26msk
A25msk
A24msk
FF420003
A24VBA
A23cmp
A22cmp
A21cmp
A20cmp
A19cmp
A18cmp
A17cmp
A16cmp
FF430003
A24MSK
A23msk
A22msk
A21msk
A20msk
A19msk
A18msk
A17msk
A16msk
FF440003
A16VBA
A15cmp
A14cmp
A13cmp
A12cmp
A11cmp
A10cmp
A9cmp
A8cmp
FF450003
A32LBA
A31ladd
A30ladd
A29ladd
A28ladd
A27ladd
A26ladd
A25ladd
A24ladd
FF460003
A24LBA
A23ladd
A22ladd
A21ladd
A20ladd
A19ladd
A18ladd
A17ladd
A16ladd
FF470003
ADDRCTL
VMELO
Rsrvd
SCVME
SCETH
A32EN
A24EN
A16EN
RAMLO
7.10.6.1 A32VBA - A32 VMEbus Base Address Register
This register contains an 8-bit value, against which extended (A32) VMEbus accesses are matched in
order to determine slave access. If VMEbus A[31..24] matches, then an access to the onboard
memory is performed.
7.10.6.2 A32MSK - A32 VMEbus Address Mask Register
This contains an 8-bit mask that is applied, on a bit by bit basis, to the VMEbus slave address
decoding for A32 (extended) accesses from another VMEbus master. If a bit is set (a 1) then the
corresponding address line is ignored. Thus the contents of this register control the size of the window
decoded by the BVME4000/6000 - refer to "7.10.4 Controlling The Window Size (on page 46)" for
more details.
7.10.6.3 A24VBA - A24 VMEbus Base Address Register
This contains an 8-bit value, against which standard (A24) VMEbus accesses are matched in order to
determine slave access. If VMEbus A[23..16] matches, then an access to the onboard memory is
performed.
7.10.6.4 A24MSK - A24 VMEbus Address Mask Register
This contains an 8-bit mask that is applied, on a bit by bit basis, to the VMEbus slave address
decoding for A24 (standard) accesses from another VMEbus master. If a bit is set (a 1) then the
corresponding address line is ignored. Thus the contents of this register control the size of the window
decoded by the BVME4000/6000 - refer to "7.10.4 Controlling The Window Size (on page 46)" for
more details.
7.10.6.5 A16VBA - A16 VMEbus Base Address Register
This contains an 8-bit value, against which A16 VMEbus accesses are matched in order to determine
slave access. If VMEbus A[15..8] matches, then a Short I/O access is performed.
7.10.6.6 A32LBA - A32 Local Base Address Register
This contains an 8-bit value that is used to drive the onboard most significant address lines during an
access by another VMEbus master. In other words it contains the most significant part of the local
memory base address of the 'dual mapped' window - refer to "7.10.5 Local Address Generation (on
page 46)" for more details.
Содержание BVME4000
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