LSI Logic Confidential
15-24
Serial I/O Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
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.
This bit always reads back as 0.
SIO DMA Engine Priority Selection Register (PRI_SEL_ADDR)
Offset = 0xBF0108
Read/Write
Default = 0x0000 0000
The DMA Engine provides a facility to fix or alter the priority of the DMA
channels requesting a transaction with SDRAM.
P2, P1, P0
Priority Mode
10:8
These bits set the priority mode as shown in
.
Programmable Priority
This setting ([P2:P0])=001) is used to alter the priority of
the DMA channels, in case a particular target channel
requires the highest priority, whatever the arbitration
scheme that is selected. The programming of these bits
overrides the default behavior.
The highest priority is assigned to the target module
channel whose ID is programmed in TGT_ID.
Rotating Priority
31
16
RSVD
15
11
10
9
8
7
0
RSVD
p2
p1
p0
TGT_ID
Table 15.4
Priority Mode Select
P2 [10]
P1[9]
P0[8]
Operation
0
0
0
No Operation
0
0
1
Programmable Priority
0
1
X
Rotating Priority
1
X
X
Fixed Priority
Содержание DMN-8600
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