Intel IXP400 manual Addressing Modes, Transfer Length

Intel® IXP400 Software

Access-Layer Components: DMA Access Driver (IxDmaAcc) API

8.7.5Addressing Modes

Addressing mode describes the types of source and destination addresses to be accessed. Two addressing modes are supported:

•Incremental Address — Address increments after each access, and is normally used to address a contiguous block of memory (i.e., SDRAM).

•Fixed Address — Address remains the same for all access, and is normally used to operate on FIFO-like devices (i.e., UART).

8.7.6Transfer Length

This is the size of the data to be transferred from the source address to the destination address. Transfer length restrictions are:

•Transfer length of 8-bit devices can be in multiple of byte, half-word, or word

•Transfer length of 16-bit devices can be in multiple of half-word or word

•Transfer length of 32-bit devices is in multiple of word

April 2005	IXP400 Software Version 2.0	Programmer’s Guide
120	Document Number: 252539, Revision: 007