Motorola MVME1X7P User Manual
LCSR Programming Model
http://www.motorola.com/computer/literature
2-35
2
VMEbus Slave Write Post and Snoop Control Register 1
This register is the slave write post and snoop control register for the first
VMEbus-to-local-bus map decoder.
VMEbus-to-local-bus map decoder.
WP1
When this bit is high, write posting is enabled for the
address range defined by the first VMEbus slave map
decoder. When this bit is low, write posting is disabled for
the address range defined by the first VMEbus slave map
decoder.
address range defined by the first VMEbus slave map
decoder. When this bit is low, write posting is disabled for
the address range defined by the first VMEbus slave map
decoder.
SNP1
These bits control the snoop enable lines to the local bus
for the address range defined by the first VMEbus slave
map decoder. The snooping functions differ according to
processor type, as shown:
for the address range defined by the first VMEbus slave
map decoder. The snooping functions differ according to
processor type, as shown:
ADDER1
When this bit is high, the adder is used for address
translation. When this bit is low, the adder is not used for
address translation.
translation. When this bit is low, the adder is not used for
address translation.
ADR/SIZ
$FFF40010 (8 bits [4 used] of 32)
BIT
15
14
13
12
11
10
9
8
NAME
ADDER
1
SNP1
WP1
OPER
R/W
R/W
R/W
RESET
0 PS
0 PS
0 PS
SNP1
Requested Snoop Operation
10
9
MC68040
MC68060
0
0
Snoop disabled
Snoop enabled
0
1
Source dirty, sink byte/word/longword
Snoop disabled
1
0
Source dirty, invalidate line
Snoop enabled
1
1
Snoop disabled (Reserved)
Snoop disabled