LSI Logic Confidential
SIO Register Descriptions
15-45
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
For write channels (transmit), this register indicates the
current value of the write pointer in SDRAM.
For read channels (receive), it indicates the current value
of the read pointer.
In double-buffer mode, this register is loaded with the
contents of ADDR_PTR1 if Go is high and if either of the
following is true:
•
The DMA channel is idle.
•
The previous SDRAM buffer has completed.
IDC DMA Transmit Address Pointer 4 Register (IDC_TX_ADDR_PTR4_ADDR)
Offset = 0xBE00D4
Read/Write
Default = 0x0FFF FFFF
ADDR_PTR4 Address Pointer 4
[27:0]
In double-buffer mode, this register is loaded with the
contents of ADDR_PTR2 if Go is high and if either of the
following is true:
•
The DMA channel is idle.
•
The previous SDRAM buffer has completed.
IDC DMA Receive Control Register (IDC_RX_CONTROL_REG_ADDR)
Offset = 0xBE00E0
Read/Write
Default = 0x0000 0000
GO
Load Current Address Buffer Registers
3
This bit is used to control when ADDR_PTR1 and
ADDR_PTR2 for a particular DMA channel are loaded
31
28
27
16
Reserved
ADDR_PTR4
15
0
ADDR_PTR4
31
16
Reserved
15
4
3
2
1
0
Reserved
GO
MODE
FLUS
CHEN
Содержание DMN-8600
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