LSI Logic Confidential
Host DMA Read/Write Protocol
8-9
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Figure 8.5
M-Mode READ
8.4
Host DMA Read/Write Protocol
The host DMA is connected to a host DMA channel (see
). As
a host DMA target, the primary bitstream interface supports dual address
DMA transfers where the DMA target is the Host DMA Data Register
(address 0x6). The Host DMA target register is accessed using a
standard host read or write (no separate DMA acknowledge is used).
Figure 8.6
Host DMA Target Transfers
To configure the DMA target register for little-endian Host transfers, set
the LE bit in the Host Control register. In this case, data bytes are
swapped when transferring data between SDRAM and the Host register.
The BSRD bit in the Host Configuration register controls the direction of
the bitstream transfers for the primary bitstream interface. The
CS (I)
RD/WR (I)
WAIT (O)
DTACK (O)
A[2:0] (I)
D[31:0] (I/O)
3
4
2
1
Address
Data
6
2
5
3
DoMiNo
Host Interface
0x6
DMA
Target
FIFO
SDRAM
Circular
Buffer
Содержание DMN-8600
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