Specifications

Rev. 1.43
User's Guide
109
VSBA24 VME Slave Base Window A24 RW
CS4 + $1069
VME slave + 3
This register sets the VME base address for the visible A24 memory window.
8260 D8 D9 D10 D11 D12 D13 D14 D15
VME D7 D6 D5 D4 D3 D2 D1 D0
Value
WinA24On MailOn VME_rmw x A23 A22 A21 A20
Default
0 0 x x 0 0 0 0
With:
A23 A22 A21 A20 VME Slave Base Address
0 0 0 0 $00'0000
0 0 0 1 $10'0000
0 0 1 0 $20'0000
0 0 1 1 $30'0000
0 1 0 0 $40'0000
0 1 0 1 $50'0000
0 1 1 0 $60'0000
0 1 1 1 $70'0000
1 0 0 0 $80'0000
1 0 0 1 $90'0000
1 0 1 0 $A0'0000
1 0 1 1 $B0'0000
1 1 0 0 $C0'0000
1 1 0 1 $D0'0000
1 1 1 0 $E0'0000
1 1 1 1 $F0'0000
WinA24On Activation of the A24 Window
0 The VME A24 slave window is inactive
1 The VME A24 slave window is active
MailOn Activation of the Mailbox function
0 An access to the Mailbox did not generates an IRQ
1 An access to the Mailbox generates an local IRQ
VME_rmw Activation of the 'pseudo RMW' cycles
0 normal VME accesses
1 'pseudo-RMW' VME accesses: BBSY and AS will not
be released
Warning
This register is accessible from both VME bus and local processor.
The user must choose that this register is accessed by either VME either local
processor, but never both at the same time.
Warning
The 'pseudo-RMW' cycle is not time-limited. If the bus has not been released
between either the VME bus timeout, either the local slave's timeout, it will create
respectively either VME bus errors for the other VME masters, either local bus error
on the slave. Thus please use the minimum VME cycles between the activation and
the deactivation of this function.
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