Motorola MVME1X7P User Manual
2-50
Computer Group Literature Center Web Site
VMEchip2
2
Local-Bus-to-VMEbus I/O Control Register
This register controls the VMEbus short I/O map and the F page
($F0000000 through $FF7FFFFF) I/O map.
($F0000000 through $FF7FFFFF) I/O map.
I1SU
When this bit is high, the VMEchip2 drives a supervisor
address modifier code when the short I/O space is
accessed. When this bit is low, the VMEchip2 drives a
user address modifier code when the short I/O space is
accessed.
address modifier code when the short I/O space is
accessed. When this bit is low, the VMEchip2 drives a
user address modifier code when the short I/O space is
accessed.
I1WP
When this bit is high, write posting is enabled to the
VMEbus short I/O segment. When this bit is low, write
posting is disabled to the VMEbus short I/O segment.
VMEbus short I/O segment. When this bit is low, write
posting is disabled to the VMEbus short I/O segment.
I1D16
When this bit is high, D16 data transfers are performed to
the VMEbus short I/O segment. When this bit is low, D32
data transfers are performed to the VMEbus short I/O
segment.
the VMEbus short I/O segment. When this bit is low, D32
data transfers are performed to the VMEbus short I/O
segment.
I1EN
When this bit is high, the VMEbus short I/O map decoder
is enabled. When this bit is low, the VMEbus short I/O
map decoder is disabled.
is enabled. When this bit is low, the VMEbus short I/O
map decoder is disabled.
I2PD
When this bit is high, the VMEchip2 drives a program
address modifier code when the F page is accessed. When
this bit is low, the VMEchip2 drives a data address
modifier code when the F page is accessed.
address modifier code when the F page is accessed. When
this bit is low, the VMEchip2 drives a data address
modifier code when the F page is accessed.
I2SU
When this bit is high, the VMEchip2 drives a supervisor
address modifier code when the F page is accessed. When
this bit is low, the VMEchip2 drives a user address
modifier code when the F page is accessed.
address modifier code when the F page is accessed. When
this bit is low, the VMEchip2 drives a user address
modifier code when the F page is accessed.
ADR/SIZ
$FFF4002C (8 bits of 32)
BIT
15
14
13
12
11
10
9
8
NAME
I2EN
I2WP
I2SU
I2PD
I1EN
I1D16
I1WP
I1SU
OPER
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RESET
0 PSL
0 PS
O PS
0 PS
0 PS
O PS
0 PS
O PS