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IC Design

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For more VLSI information, please visit http://www.pythonclub.org/vlsi/start

DeCap Cell (Decoupling Capacitors)

What are Decaps?

  • Decaps are on-chip decoupling capacitors that are attached to the power mesh to decrease noise effects
  • Decaps are most effective when placed closest to the loads

MOS Transistor Model

This is the basic model of MOS Transistor, memorize the size matters.

ICC Commands List

ICC Manpage

gui_cmds:

 get_gui_stroke_bindings, gui_add_annotation, gui_add_ruler_point,
 gui_add_toolbar_item, gui_apply_error_filters,
 gui_cell_displacement_vm_bin, gui_change_error_highlight,
 gui_check_drc_errors, gui_clear_filter_errors,

Ebook: Principles of Semiconductor Devices

Ebook Name:

Principles of Semiconductor Devices

Free Download:

http://ecee.colorado.edu/~bart/book/book/index.html

Trueuve Recommand:

Inverter Layout

Inverter is the simplest cell in COMS Design, and inverter layout alos is the simplest one.

Here I will show you the inverter circuits and inverter layout.

Float Pin

A float pin is a user-defined timing model that describes a delay as seen from a pin. If you expect that a float pin is to be rising edge, you should specify max_rise and min_rise delay.If you expect it to be falling edge, you should specify max_fall and min_fall delay. If you expect it to be both rising and falling edge, you should specify all 4 delays: max_rise, min_rise, max_fall, and min_fall. Float pins are used in the following situations:

IC Compiler & PrimeTime Timing Correlation Checklist

PrimeTime is the signoff tool for backend design. IC Compiler some settings are not compatible with PrimeTime. Here is the check list for ICC & PT Correlation.

1. Set switches in IC Compiler to be compatible with PrimeTime settings

Recovery and Removal Timing for Asynchronous set/reset Signals

In short words, recovery and removal timing are setup/hold constrains for set/reset pins.

Why we need recovery and removal timing model:

To make sure a register behaves correctly, deassertion (the transition to an inactive state) of an asynchronous control must not take place close to the time the clock edge occurs. If these events are close together, the state of the register is uncertain.

Leakage Power For Different Voltage Threshold Lib Cells: LMP/LXP/SXP/HXP

For different voltage threshold groups, cell leakage is different. A common way to reduce leakage power is to swap LVT cells to HVT cells. LVT & HVT cells usually have the same area, pin, and layout.

VDD VSS VCC的含义

VDD/VSS等术语简介:

  • VDD:电源电压(单极器件);电源电压(4000系列数字电路);漏极电压(场效应管)
  • VCC:电源电压(双极器件);电源电压(74系列数字电路);声控载波(Voice Controlled Carrier)
  • VSS:地或电源负极
  • VEE:负电压供电;场效应管的源极(S)
  • VPP:编程/擦除电压。

VDD/VSS等术语详解: