Power rail discontinuity – We would like to have continuous power rail.N- and P-diffusion discontinuity – We would like to have continuous diffusion. For my Physical design friends, remember, we add “FILLER” cells at the end of routing, and you always wondered why we are doing so.Small substrate contacts – Except for inverter, all substrate contacts are single width, which will create high resistance path for current, thus increasing “Clk-to-Q” delay.Hanging metal1 – If you see for the NAND gate outputs, there is lot of hanging metal1.
So glad and happy to let you know that we will be presenting in RISC-V workshop at IIT Madras, India, on July 19, 2018 at 2pm (organized by RISC-V foundation), and topic is something which we have mastered in last 7 years – its about a survey of E31 RISC-V core floorplan and its impact on power, performance and area.
A good takeaway from above is which is the best flow – Well, there is no single answer to this. You can use “flow 1”, if your organization is constrained by cost and comparable performance, and you can go for “flow 2” if performance is the criteria.
Just to give you some background, picoSoC is an example SoC using PicoRV32, and PicoRV32 is a size-optimized RISC-V CPU which implements RV32IMC instruction set architecture.
If you learn this tool and use it to build your own applications, you might end up presenting a paper in our online conference happening soon called “VSDOpen” – The first ever online conference on opensource EDA.
SPI model is a master/slave model. There’s some SPI master which determines who gets to transmit and who gets to receive. The output from SPI master is called MOSI (Master Out Slave In). If you have 2 slaves, slave 1 and slave 2, as shown below, MOSI goes to all the slaves .Then you have another line MISO (Master In Slave Out). All the wires are connected, as shown in below image. Then you have a master only function called SCLK, which goes to all the slaves. Now also, there must be a slave select (SS) for S1 and a slave select for S2.
Why “integrated”? Because at lower nodes, you have to integrate other parts of the flow. Sign-off (you can see power and timing buttons below), clock tree synthesis (you can see synthesis button) must be integrated, so we have a fully integrated PnR flow that we built from day one.
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