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Questions tagged [asic]

An ASIC is an Application Specific IC. It is a custom chip that is made at the factory.

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Flipflop value a long time after startup

After power up in an ASIC, is it save to assume that all flipflops are in a stable state ('0' or '1')? I do not care in which stable state they are, but it is crucial that all metastability has ...
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Finite state machine to detect if a number is divisible by 5 if LSB comes first [duplicate]

If MSB comes in first, we can keep track of the remainder for each new bit since the additional bit will either cause the number to be 2x or 2x+1. But if LSB comes in first, how can we come up with ...
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Single Clock FIFO with Single Port RAM

I wanted to make use of a single port RAM to be a single clock FIFO in verilog for an asic project , due to some constraints i can not use the dual port RAM. My confusion is when I have to perform ...
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10 views

Supra ATPG- Mentor tools

If anyone used Supra ATPG, Can you guys tell me difference between EDT short chain mode and EDT bypass mode.
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1answer
66 views

Sequence of evaluation in the following non blocking code?

I have the following verilog code that I came across and trying to find the sequence of evaluation. What value does 'A' have at the end of a cycle and after 5 cycles, when the value of A is 'x' at ...
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22 views

Synopsys Technology File (STF)

I am using a memory IP block from STM. The manuals of the memory IP has talked a lot about Synopsys Technology File (STF), though, with no info on how and where to use it. Among all files related to ...
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42 views

Do Broadcom's Ethernet chipsets need special software to operate?

I want to implement an Ethernet switch using Broadcom's chips. Are singing an NDA and getting the datasheets enough to work with the chips? I have heard that the chips must be programmed by a special ...
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124 views

Multiple Reset Synchronization

I have two active low async resets (rst_na and rst_nb) and associated two clocks (clk_a and clk_b). Assume Block B required ...
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38 views

How to simulate a piezoresistive pressure sensing MEMs layout without COMSOL?

I have a masks layout of a Piezoresistive MEMs pressure device that I've designed in LEdit(Tanner Tools Eda). The device consists of 4 piezoresistors bonded onto a thin diaphragm which deforms ...
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152 views

High-Level Synthesis (HLS) vs RTL for ASIC flow

I'd like to know when it's a good idea to use HLS over RTL (Verilog/VHDL) design if I'm targetting ASIC implementation? Can synthesis tools like Design Compiler convert HLS C/C++ into gate-level ...
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4answers
367 views

Is an ethernet switch considered as an ASIC?

I work as an electronic reliability engineer. In order to estimate the reliability of integrated circuits, I need to know their type. Thus my question. Is this ethernet switch Marvell Link Street-...
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TSMC's 16nm FF+ “GL” and “LL” variants

TSMC has GL and LL variants for their 16nm FinFET plus process. (For example, see here.) What do GL and LL stand for? Is there publicly available information about the differences between these two ...
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370 views

Are there fully open-source ASICs?

The Ethereum Foundation (an open-source project) will build an open-source ASIC to support its decentralised randomness beacon. To date, has the RTL of any ASIC been open-sourced or will the Ethereum ...
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2answers
179 views

Beyond liquid helium cooling

Liquid helium has a boiling point of around -269°C and is used by overclockers. It has led to various world records (e.g. see here and here). What cooling technology can beat liquid helium for the ...
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47 views

Maximum power draw density of digital ASIC

Given a process node (e.g. TSMC's 16nm FinFET+) what is the maximum power per mm2 that a digital ASIC can draw? Secondary question: Assuming liquid nitrogen cooling, what would be the bottleneck ...
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How can I access process node data sheets?

I am searching for process node data sheets. Specifically, I'm interested in TSMC's 16nm, 12nm, 10nm, 7nm nodes, as well as Samsung's 14nm, 10nm nodes. I did not find anything with Google. How can I ...
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188 views

Gate and routing delays as a function of voltage and temperature

As I understand from watching overclocking videos, the maximum operating frequency of a digital ASIC is a function of voltage and temperature. Specifically, it seems that the maximum operating ...
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2answers
180 views

how slow are modelsim free licences?

I know in free licenses of modelsim / questa simulations run slower than the full version. But how slow? will it be 2x 3x 10x faster in the paid version? what about actel/microsemi free version ?
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What is meant by process “performance”?

I am reading the product page for TSMC's 20nm process. It states Compared to its 28nm node, the 20nm process provides 15% better performance and can reduce total power consumption by a third. What ...
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1answer
164 views

Large SiGe ASICs for digital logic

I am trying to understand if digital ASICs with tens of millions of silicon-germanium gates exist. A comment in another post states (emphasis mine) "SiGe can hit 5 GHz pretty easily even with half a ...
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1answer
90 views

65nm silicon-germanium

The Wikipedia page on silicon-germanium states that AMD and IBM worked on a 65nm SiGe process. Unfortunately the source is no longer up and I cannot find more information about the 65nm SiGe process. ...
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4answers
598 views

Exotic semiconductors for fast digital ASIC

I am researching exotic semiconductors for a digital ASIC with a few million logic gates which should run as fast as possible within a $30 million budget. (Specifically, I need to do a single fully-...
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211 views

How to constrain a clock signal out from a multiplexer

How would you constrain this design? ext_clk and clk_in are asynchronous to each other. clk_div is derived by clk_in with double period. clk_out may be driven by either clk_in and ext_clk, ...
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1answer
66 views

How to find a design house with dynamic memory device support? [closed]

I am looking for a design house with dynamic memory device support. Design houses, I found on the web, support only analog, mixed-signal, high-voltage designs and so. I found no design house with ...
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85 views

How do I give clock constraint for a ring oscillator output?

I have 2 clocks in my design. One slow External clock and one high frequency ring oscillator clock. For external clock I am using the create_clock command to specify timing. The ring oscillator block ...
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Gated integrator IC, non continuous

Can anyone give me any suggestions for some good gated voltage integrators that aren't continuous, and more like a boxcar integrator? I want to integrate the the total voltage across a pulse coming ...
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Advanced library format(ALF) in ASIC layouting

I have in some places worked with layout tools, where you could export .lef/.def files from your design. Now I was introduced to the .alf which seems from its capabilities to be superior to lefdef, ...
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237 views

Edge aligned Source synchronous outputs

This is a basic block diagram of source synchronous interface I found in altera document. Here This is how edge aligned source synchronous output looks like. They say the reciever will shift the ...
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2answers
197 views

What material(s) are used in IC's as insulating layers between metal layers?

This question and the answers hits close to the topic. One picture shows it as SOD. Silicon-oxide dielectric? I'm aware that around/within the transistor, silicon oxide is grown for insulation where ...
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1answer
1k views

What are Soft, Firm and Hard IP Cores? [closed]

My understanding of Intellectual Property (IP) Cores is that they are specific FPGA or ASIC circuit layouts or setups with the intention of being sold for general use. What are Soft, Firm and Hard IP ...
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1answer
100 views

Can we connect both ASIC and an FPGA both to the same physical output Ethernet ports at the same time? [closed]

I am doing simulation of my research design on single FPGA, in which I simulated two switching chips ASIC and an FPGA. I mean, I simulated single FPGA working as two chips, and connected them so that ...
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1answer
201 views

VHDL: Optmize signal comparisons for synthesis

As a preface, there are certain coding styles used in VHDL/Verilog which help the synthesis tools infer different hardware(some better in perfomance than the other). For example using an if-else-if ...
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1answer
665 views

Aggregate of 2 vectors in VHDL

I am checking what I can and cannot do in aggregating and concatenating in VHDL. while I can combine two vectors by concatenating them, I keep getting error if I use aggregate. I saw one answer here ...
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1answer
75 views

How to scale output of butterfly unit radix 2 for further stages?

I am designing 8 point FFT by radix 2 using verilog. I am using radix 2 butterfly unit with 8 bits input and so output. I expect to be 8 bit so that I can use this structure again and again for ...
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270 views

Is it Possible to Design an Entire Operating System or App using ASIC Chips? [closed]

ASIC chips are hundreds of times faster than traditional chips. Is it possible to design an entire operating system or application using a full custom ASIC chip? Based on what I've read I understand ...
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1answer
194 views

Good practices for full-custom IC measurement? [closed]

I am a Junior Analog IC Designer and I want to characterize a full-custom IC. The thing is that I want to do it well and I don't know any reference with good practices and PCB design guidelines for ...
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187 views

ASIC v.s. State Machine - same difference? [closed]

Are ASIC chips the equivalent of "State Machines" in computer science ? There are no "programs" or "instructions" that are executed. All the changes occure because of the inputs on the gates when the ...
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287 views

Is there a fieldbus with more than 250 nodes per segment?

We plan to realize a sensor cable several 1000m long which has ideally every 1-2m a magnetic field sensor on a small 10x30mm platine with microprocessor/FPGA for DSP and I2C on chip communication. ...
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1answer
395 views

Timing Constraints

I need to sample 24-bit data on a DAC at 25 MHz. The data comes from a design, I implemented on FPGA. In every clock cycle, the FPGA outputs a 24-bit data, which the DAC has to sample in the next ...
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How to measure dynamic power consumption of each component of a Microcontroller?

I am interested to get the dynamic power consumption of each of the component of a micro-controller. Can I do it by adding the power lines in place and route (PAR)? The purpose of it to get the more ...
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1answer
359 views

How to determine No. of Transistors in a chip? [closed]

How can I know the exact No. of transistors in my chip before fabrication and after fabrication? It is possible to count transistors using LVS (Layout Vs. Schematic), but its valid for Final Layout ...
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5answers
981 views

Is it good practice to always assign initial value and reset signals in digital design?

I have read that initial values to a signal can be set in an FPGA since the design is "loaded into it" after power up. However, in ASICs we can only rely on a reset signal to put all signals into a ...
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1answer
191 views

Clarification on terminology : RF Signal

I frequently come across the term 'RF Signal' in circuits for ex in the below picture, please ignore the functionality of circuit not important.: I understand RF means Radio frequency but what I dont ...
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3answers
722 views

How is ASIC design different from FPGA design? Do you write HDL (Verilog, VHDL) to design and ASIC the same way you would for an FPGA?

From my limited understanding i feel as though one could just take the synthesis output from Verilog/VHDL code and then use that design to fabricate on silicon the sea of gates.
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1answer
371 views

Calculating resistance for metal layer from LEF File

I have a .LEF File which has various metals description and their parasitics information. I am trying to calculate R. It is specified as RPERSQ = 0.278. In the File description it is written as ...
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1answer
470 views

ASIC verification of a FIFO with “n” unique items

simulate this circuit – Schematic created using CircuitLab I have a synchronous FIFO. The depth of the FIFO is 32. Everytime the FIFO has 7 or any "n" unique elements inside it, "unique" ...
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4answers
2k views

Can you get a Passive ASIC?

In super small low power devices, where space is a big premium, complicated passive networks can take up a lot of space. Is it possible to get a passive or mostly passive ASIC fabricated? If it is ...
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1answer
97 views

Can I order PCB/chip manufacture from provided LOTOS specification?

Is there a way to automatically deduct PCB and/or chip design from formal problem specification of a problem (task) which supposed to be solved on a PCB/chip? I'm currently implementing solution with ...
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2answers
232 views

Can the same net-list file be used for ASIC design flow as well as FPGA design flow?

I have mostly worked on front-end part and don't know much about back-end stuff. I have gone through the reading about the various abstraction levels of design flows of FPGAs and ASICs. I was ...
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2answers
96 views

Mixing reset and non reset registers

If you must mix synchronous reset and non reset flops in a single always block, would this be the correct way... ...