1-23
General Information
Model 743 and Model 744 VME Board Computers
VME Controller ASIC
A VME controller ASIC, with the VME backplane it plugs into, manages the board com-
puter’s interface to the VMEbus. The VME controller ASIC also controls the RS-232 B port
interface.
Table 1-19 shows the VME addressing capabilities and Table 1-20 shows data transfer capa-
bilities of the VME controller ASIC.
Table 1-19
VME Addressing Capabilities
Function
Capabilities
DMA as master
A16, A24, A32 with programmable address modifiers
Location monitor
A16, A24, A32
Message FIFO as slave
A16, A24, A32
PA memory as slave
A24, A32
Processor as master
A16, A24, A32 with programmable address modifiers
Table 1-20
VME Data Transfer Capabilities
Function
Capabilities
Supported Transfer Type
DMA as master
D08
Only for first cycle/last cycle alignment
D16
Block or non-block
D32
D64
Block only
Message FIFO as
slave
D08
O
D16, D32
Non-block only, only D7-D0 are significant
PA memory as slave
D08
EO
D16
Block
D32
D64
Processor as master
D08, D16, D32
Non-block only
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