LSI Logic Confidential
Master DMA Registers
8-27
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
other master DMA register other than the stop address
register.
1 = Start master DMA transfers
0 = Start master DMA transfers
Flush master DMA FIFO and terminate transfer without
interrupt
Ainc
2
If Ainc is set, then master mode DMA transfers increment
the host bus address by two bytes each time a master
mode DMA bus cycle is performed.
If Ainc is clear, then master mode DMA transfers use the
same host bus address for an entire DMA transfer.
1 = Increments host bus address by 2 bytes
0 = Uses same host bus address for entire DMA transfer
BSRD
Bitstream READ
1
If BSRD is set, the master DMA transfers will be read by
the system-- i.e. the data is being output by DoMiNo.
If BSRD is clear, master DMA transfers will be written by
the system. BSRD should not be changed while the
GO bit is set.
1 = DMN-8600 processor outputs the DMA data
0 = System writes the master DMA transfers
WRData
WRITE Data
0
The value of this bit is written to any selected bits during
host DMA configuration register writes. Bits to be written
are selected by placing a “1” in each desired location as
the register is written. Any bit positions that contain a “0”
during register writes remain unchanged.
Value is written to selected bits.
8.8.2
Master DMA External Address Register (Cbus: 0x6F014)
This register at control bus address 0x6F014 specifies the external
device address for master mode master DMA transfers. When GO is set,
this register specifies the starting master bus address where master
DMA data will be stored or read. As data is transferred, this register is
updated if Ainc is set in the master DMA configuration register. The two
Содержание DMN-8600
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