Motorola MVME172 - Manual (Page 136)

2-58 Computer Group Literature Center Web Site
VMEchip2
2
TVME This bit defines the direction in which the DMAC
transfers data. When this bit is high, data is transferred to
the VMEbus. When it is low, data is transferred to the
local bus.
LINC When this bit is high, the local bus address counter is
incremented during DMA transfers. When this bit is low,
the counter is not incremented. This bit should normally
be set high. In special situations such as transferring data
to or from a FIFO, it may be desirable to not increment the
counter.
VINC When this bit is high, the VMEbus address counter is
incremented during DMA transfers. When this bit is low,
the counter is not incremented. This bit should normally
be set high. In special situations such as transferring data
to or from a FIFO, it may be desirable to not increment the
counter.
SNP These bits control the snoop signal lines on the local bus
when the DMAC is local bus master and it is not accessing
the command table.
0 Snoop inhibited
1 Snoop enabled
INTE This bit is used only in the command chaining mode and
it is only modified when the DMAC loads the control
register from the control word in the command packet.
When this bit in the command packet is set, an interrupt is
sent to the local bus interrupter when the command in the
packet has been executed. The local bus is interrupted if
the DMAC interrupt is enabled.