Scatter-Gather Direct Memory Access (DMA) Controller

Direct Memory Access (DMA) is a technique for transferring blocks of data between system memory and peripherals without a processor (e.g., system CPU) having to be involved in each transfer. DMA not only offloads a system’s processing elements, but can transfer data at much higher rates than processor reads and writes.

Scatter-Gather DMA augments this technique by providing data transfers from one non-contiguous block of memory to another by means of a series of smaller contiguous-block transfers.  The Lattice Scatter-Gather DMA Controller core implements a configurable, multi-channel, WISHBONE-compliant DMA controller with scatter-gather capability.

Features

• Supports up to 16 physical channels
• Up to 8 sub-channels per physical channel
• Four priority levels using round-robin arbitration (weighted or simple)
• WISHBONE bus widths from 8 to 128 bits
• Simple DMA, split transfers, scatter-gather
• Direct interface to external RAM for packet buffering
• Autonomous and hardware-directed retry
• Supports WISHBONE burst and classic-cycle transfers
• Supports centralized and distributed DMA control architectures

Performance and Resource Utilization

1. Performance and utilization data are generated using an LFE3-95E-7FN672CES device with Lattice Diamond 1.0 software using Synopsys Synplify Pro for Lattice D-2009.12L-1. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP3 family.

1. Performance and utilization data are generated using an LFE2M35E/SE-6F672C device with Lattice Diamond 1.0 software using Synopsys Synplify Pro for Lattice D-2009.12L-1. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2M/S family.

1. Performance and utilization data are generated using an LFE2-35E/SE-6F672C device with Lattice Diamond 1.0 software using Synopsys Synplify Pro for Lattice D-2009.12L-1. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2 family.

1. Performance and utilization data are generated using an LFSC3GA25E-6FF1020C device with Lattice Diamond 1.0 software using Synopsys Synplify Pro for Lattice D-2009.12L-1. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeSC/M family.

1. Performance and utilization data are generated using an LFXP2-40E-6F672C device with Lattice Diamond 1.0 software using Synopsys Synplify Pro for Lattice D-2009.12L-1. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeXP2 family.

Ordering Information

IP Version: 2.5
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