LSI Logic Confidential
15-58
Serial I/O Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
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.
•
The previous SDRAM buffer has completed.
IR1 DMA Transmit Address Pointer4 Register (IR_TX_ADDR_PTR4_ADDR)
IR2 DMA Transmit Address Pointer4 Register (IR2_TX_ADDR_PTR4_ADDR)
Offset = 0xBF0054 / 0xBF00D4
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.
31
28
27
16
RSVD
ADDR_PTR4
15
0
ADDR_PTR4