Comment
Author: Admin | 2025-04-28
They also have power rails in the same location for all the standard cells, so power rails can also be abutted easily. 3. Easy to route: All the pins of standard cells are in the intersection of horizontal and vertical tracks, So it becomes easy to route them by the APR toolTracks in standard cells:Track can be defined as a line on which metal layers are drawn. A track means one M1 Pitch. Height of Standard cell is generally measured in term of no. of tracks inside it. like a 6T standard cell means that the height of the standard cell is 6 Track of M1. An example of 13T standard cell is given below in figure-5.Figure-5: A 13T height standard cellIn the above example, the height of one track is 190 nm. So total height of cell is 13T = 2470 nm (13 x 190) and width is 5T = 950 nm (5 x 190). Various heights standard cell library:Generally, there are various sets of standard cell library having different track size of standard cells. Depending on the use of ASIC, track height a standard library has selected. There are generally three sets of standard cell library characterized as small transistor standard cell, large transistors standard cell and medium transistor standard cell. An example for 6T, 12T and 9T size standard cells are shown below.Figure-6: Various height's of standard cell Small transistor standard cells are used for high-density design and these cells having low power consumption. Large transistors standard cells large area but having very good performance. Medium transistors standard cells have a balance between large transistors and small transistors. So there is a tradeoff between area/power vs performance. A comparison has been shown below in figure-7.Figure-7: Tradeoff between performance and area for various heights standard cellVarious applications of these cells are as bellow.Small transistor cells (6T Cells)Minimum area and low powerMobile applicationsUltra-low-power applicationsEmbedded microcontrollerLarge transistors cells (12T Cells)Large areaHigh performance and speedHigh-speed computing Critical blocksMedium transistors cells (9T Cells)Balance area and performanceGeneral ComputingGPUGeneral-purpose circuitThank you!
Add Comment