| commit | 32dd11b976c29d76775d2ee4973bc128d1e8b108 | [log] [tgz] |
|---|---|---|
| author | Eunchan Kim <eunchan@google.com> | Tue Nov 05 15:15:33 2019 -0800 |
| committer | Eunchan Kim <eunchan@google.com> | Wed Nov 06 11:00:40 2019 -0800 |
| tree | 5fe7dc70728286d40e5e8f3a5bc540700b5f3198 | |
| parent | 42765f88a7ba6ae6b7578906e098c40baed26ea8 [diff] |
[reggen] Remove FIFO depth when window is used
Problem:
reggen creates unintentional TL-UL buffers inside `tl_socket_1n` for
window feature, which creates higher number of outstanding
acceptances in the device port.
When `window` feature was implemented, `tlul_fifo_sync` doesn't have a
way to remove internal FIFO. So, when instantiating `tl_socket_1n` for
`window` requests, `ReqDepth` and `RspDepth` are set to 1h. It results
in the number of outstanding acceptances in a IP that having a window
port, to be more than or equal to 4 at least. One buffer in HReq,
another in DReq, 1 in DRsp, and 1 in DReq.
This PR is to remove the FIFO inside tlul_socket_1n, thanks to @tjaychen
added the condition of Depth == 0 and Pass == 1 case.
The IPs, for instance HMAC, still have a buffer internally. If
`tlul_adpater_sram` is used to convert TL-UL interface to the SRAM
interface, that module still has buffers internally.
The issue is discussed in #860
Signed-off-by: Eunchan Kim <eunchan@google.com>
OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the the OpenTitan site and OpenTitan docs for more information about the project.
This repository contains hardware, software and utilities written as part of the OpenTitan project. It is structured as monolithic repository, or “monorepo”, where all components live in one repository. It exists to enable collaboration across partners participating in the OpenTitan project.
The project contains comprehensive documentation of all IPs and tools. You can either access it online or build it locally by following the steps below.
$ sudo apt install python3 python3-pip $ pip3 install --user -r python-requirements.txt
$ ./util/build_docs.py --preview
This compiles the documentation into ./build/docs and starts a local server, which allows you to access the documentation at http://127.0.0.1:1313.
Have a look at CONTRIBUTING for guidelines on how to contribute code to this repository.
Unless otherwise noted, everything in this repository is covered by the Apache License, Version 2.0 (see LICENSE for full text).