Motorola MVME147 Installation And Use Manual page 94

Programming
Timer Configuration Register
ADDRESS
FFFE2009
4
Bits 0-1
Bits 2-3
4-44
BIT 7 BIT 6 BIT 5
ARBT0 VBTO1 VBTO0 ACTO1 ACTO0 LBTO1 LBTO0
R/W R/W
These two bits conÞgure the local time-out period. They are set
to 1 by any reset.
LBTO1
0
0
1
1
The local bus timer activates bus error to the MC68030 when it
tries to access nonexistent locations in the local memory map.
These two bits conÞgure the VMEbus access time-out period.
They are set to 1 by any reset.
ACTO1
0
0
1
1
The VMEbus access timer activates bus error to the MC68030
(except on write posted time-outs) when the VMEchip is
unsuccessful in obtaining the VMEbus within the time-out
period.
BIT 4 BIT 3 BIT 2
R/W R/W R/W
LBTO0 Time-Out Period
0 102 microseconds
1 205 microseconds
0 410 microseconds
1 Timer disabled
ACTO0 Time-Out Period
0 102 microseconds
1 1.6 millisecond
0 51 milliseconds
1 Timer disabled
BIT 1 BIT 0
R/W R/W