Datasheet

316
32072H–AVR32–10/2012
AT32UC3A3
19. DMA Controller (DMACA)
Rev: 2.0.6.6
19.1 Features
• 2 HSB Master Interfaces
• 4 Channels
• Software and Hardware Handshaking Interfaces
– 8 Hardware Handshaking Interfaces
• Memory/Non-Memory Peripherals to Memory/Non-Memory Peripherals Transfer
• Single-block DMA Transfer
• Multi-block DMA Transfer
– Linked Lists
– Auto-Reloading
– Contiguous Blocks
• DMA Controller is Always the Flow Controller
• Additional Features
– Scatter and Gather Operations
– Channel Locking
– Bus Locking
– FIFO Mode
– Pseudo Fly-by Operation
19.2 Overview
The DMA Controller (DMACA) is an HSB-central DMA controller core that transfers data from a
source peripheral to a destination peripheral over one or more System Bus. One channel is
required for each source/destination pair. In the most basic configuration, the DMACA has one
master interface and one channel. The master interface reads the data from a source and writes
it to a destination. Two System Bus transfers are required for each DMA data transfer. This is
also known as a dual-access transfer.
The DMACA is programmed via the HSB slave interface.