Comments (2)
You are right that the clock is not driven differentially, as it is optional and could be driven "single-ended". For example, this datasheet mentioned it.
Regarding speed, the current clock is 81Mhz, as the memory runs with the same clock as the logic. DDR primitives (ODDR/IDDR) are used to handle double data rate transfers. According to datasheet, frequencies above 83Mhz need more delay cycles and thus changes to the config registers.
The I/O ports are different because the chip has two memory dies (4M bytes each). O_psram_ck[1] and etc are for the second die. My code only uses the first die although the interface defines two dies.
Timing is quite tricky with HyperRAM, especially with the phase-shifted clock (clk_p). What I did was output the signals (clk, clk_p, rwds, dq etc) through debug pins and observe them with a logic analyzer and then compare with requirements from the datasheet. Good luck with your project.
from psram-tang-nano-9k.
Great, now I follow. Thanks!
from psram-tang-nano-9k.
Related Issues (6)
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from psram-tang-nano-9k.