LSI Logic Confidential
SIO Register Descriptions
15-75
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
SPI DMA Transmit Address Pointer3 Register (SPI_TX_ADDR_PTR3_ADDR)
Offset = 0xBE0050
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.
•
The previous SDRAM buffer has completed.
SPI DMA Transmit Address Pointer4 Register (SPI_TX_ADDR_PTR4_ADDR)
Offset = 0xBE0054
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_PTR3
15
0
ADDR_PTR3
31
28
27
16
RSVD
ADDR_PTR4
15
0
ADDR_PTR4