Ip Dma Snoop Control (S5 Pins 1/2); Table 1-4. Switch S5 Snoop Control Encoding - Motorola MVME162P-344 Series Installation And Use Manual

Hardware Preparation and Installation
1

IP DMA Snoop Control (S5 Pins 1/2)

S5-1
(SC1)
On
On
Off
Off
1-18
Segments 1 and 2 of switch S5 define the state of the snoop control bus
when an IP DMA controller is local bus master. As shown in
segment 1 controls Snoop Control signal 1 on the MC680x0 processor. S5
segment 2 controls Snoop Control signal 0. Setting a segment to
produces a logical 0; setting it to
ON
4
1
S5 varies in function according to the type of processor installed. For
MVME162P4 boards with an MC68040 processor, setting segments 1 and
2 of switch S5 to
OFF
configuration) inhibits snooping. Enabling snooping requires one of two
possible / combinations, according to the operation desired.
ON OFF
MVME172P4 boards with an MC68060 processor have different snoop
functionality.
The following table lists the snoop operations represented by the settings
of S5 with both types of processor. For further details, refer to the
MC68040 or MC68060 microprocessor user's manuals listed in the
Related Documentation appendix.

Table 1-4. Switch S5 Snoop Control Encoding

S5-2
(SC0)
On Snoop disabled
Off Source dirty, sink byte/word/longword
On Source dirty, invalidate line
Off Snoop disabled (Reserved)
produces a logical 1.
OFF
S5
OFF
Snoop inhibited
(factory configuration)
or leaving both segments set to
Requested Snoop Operation
MC68040
Computer Group Literature Center Web Site
Table 1-4, S5
ON
2736 0004 (1-3)
(the factory
ON
MC68060
Snoop enabled
Snoop disabled
Snoop enabled
Snoop disabled