LSI Logic Confidential
15-48
Serial I/O Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
IDC DMA Receive Address Pointer 2 Register (IDC_RX_ADDR_PTR2_ADDR)
Offset = 0xBE00EC
Read/Write
Default = 0x0000 0000
ADDR_PTR2 Address Pointer 2
[27:0]
In double-buffer mode, this register indicates the End
Address for the next SDRAM buffer about to be trans-
ferred.
Note:
The maximum size for each SDRAM buffer transfer is 511
bytes. Therefore, the difference between ADDR_PTR2 and
ADDR_PTR1 should not exceed 511.
IDC DMA Receive Address Pointer 3 Register (IDC_RX_ADDR_PTR3_ADDR)
Offset = 0xBE00F0
Read/Write
Default = 0x0000 0000
ADDR_PTR3 Address Pointer 3
[27:0]
This register is updated by hardware during a DMA oper-
ation.
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.
31
28
27
16
Reserved
ADDR_PTR2
15
0
ADDR_PTR2
31
28
27
16
Reserved
ADDR_PTR3
15
0
ADDR_PTR3
Содержание DMN-8600
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