LSI Logic Confidential
15-72
Serial I/O Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
HDIV
Clock Divider, MSB
13:7
The SPI_CLK frequency is determined by the following
equation:
SIO_SPI_CLK = sysclk / 2(p 2)
where progdiv = {HDIV, SPED}
(That is, progdiv is the concatenation of HDIV bits in the
SPI Clock Divider register with the SPED bits in the SPI
Configuration register.)
SPI DMA Transmit Control Register (SPI_TX_CONTROL_REG_ADDR)
Offset = 0xBE0040
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
into the “current buffer” address registers (ADDR_PTR3
and ADDR_PTR4) in double-buffer mode operation.
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.
Note:
DoMiNo always runs in double-buffer mode. Single-buffer
(ring buffer) mode is not supported.
Go is set by software after the address range for the “next
buffer” is programmed (ADDR_PTR1/ADDR_PTR2).
Go is cleared by the hardware after these “next values”
are loaded. It is also cleared on reset.
MODE
Transfer Mode Select
2
This bit must always be set to ‘1’ so that the channel
operates in double-buffer mode.
31
16
RSVD
15
4
3
2
1
0
RSVD
GO
MODE
FLUS
CHEN
Содержание DMN-8600
Страница 14: ...LSI Logic Confidential xiv Contents Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...
Страница 18: ...LSI Logic Confidential xviii Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...
Страница 64: ...LSI Logic Confidential 7 6 Memory Mapping Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...