zipcpu / wbsata

Wishbone SATA Controller

Wishbone SATA Host Controller

Several projects of mine require a WB SATA controller. The 10Gb Ethernet switch project is an example of one of these projects. This repository is intended to be a common IP repository shared by those projects, and encapsulating the test bench(es) specific to the SATA controller.

A couple quick features of this controller:

1. Since the ZipCPU that will control this IP is big-endian, this controller will need to handle both little-endian commands (per spec) and big-endian data.

   There will be an option to be make the IP fully little-endian.

2. My initial goal will be Gen1 (1500Mb/s) compliance. Later versions may move on to Gen2 or Gen3 compliance.

Hardware

My test setup is (at present) an Enclustra Mercury+ST1 board with an Enclustra Kintex-7 160T daughter board, connected to an Ospero FPGA Drive FMC.

Status

While fully funded, this project is currently a work in progress. It is not (yet) fully drafted. At present it needs three significant capabilities before it can move to simulation (or hardware) testing:

1. A means of issuing and detecting out-of-band signaling: COMINIT, COMRESET, and COMWAKE.

   Yes, the Xilinx GTX transceiver can handle these, however the logic isn't yet present within the IP to handle the control signals to either generate (on TX) or handle (on RX) these various signals.

2. A simulation model. While I typically use C++ Verilator models, this IP will require a Verilog model to make sure GTX transceiver works as expected--to include the verifying that the out-of-band signals are properly detected and handled.

3. A means of debugging in hardware. I normally do my hardware debugging using a Wishbone scope. This is my intention here as well. However, the WBSCOPE can only capture 32-bits per clock cycle. In this case, I'll either need to expand that to more bits per clock cycle, or I'll need to choose from among the many critical bits within the IP which 32-bits per cycle are the ones I want to capture. This little bit of engineering hasn't (yet) taken place. It needs to take place before I can test on the hardware I have.

License

The project is currently licensed under GPLv3. The ETH10G project that will use this capability will relicense it under Apache2.