859e3d2ed1
Currently the DMAC uses a simple FIFO as the store-and-forward buffer. The FIFO handshaking is beat based whereas the remainder of the DMAC is burst based. This means that additional control signals have to be combined with the FIFO handshaking signal to generate the external handshaking signals. Re-work the store-and-forward buffer to utilize a BRAM that is subdivided into N segments. Where N is the maximum number of bursts that can be stored in the buffer and each segment has the size of the maximum burst length. Each segment stores the data associated with one burst and even when the burst is shorter than the maximum burst length the next burst will be stored in the next segment. The new store-and-forward buffer takes care of generating all the handshaking signals. This means handshaking is generated in a central place and does not have to be combined from multiple data-paths simplifying the overall logic. The new store-and-forward buffer also takes care of data width up- and down-sizing in case that the source and sink modules have a different data width. This tighter integration will allow future enhancements like using asymmetric memory. This re-work lays the foundation of future enhancements to the DMA like support for un-aligned transfers and early transfer abort which would have been much more difficult to implement with the previous architecture. In addition it significantly reduces the resource utilization of the store-and-forward buffer and allows for better timing due to reduced combinatorial path lengths. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> |
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README.md
HDL Reference Designs
Analog Devices Inc. HDL libraries and projects.
Getting started
This repository supports reference designs for different Analog Devices boards based on Intel and Xilinx FPGA development boards or standalone.
Prerequisites
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