Question

2. SRAM: (a) [6%) Explain what are the purposes of the three signals in the following 6-transistor SRAM cell: word, bit, bit_b (b) [6%) Why not just use one bit line instead of two? Briefly explain it. (c) [10%) Briefly describe how the 6-transistor SRAM cell works for READ (d) [10%) Briefly describe how the 6-transistor SRAM cell works for WRITE bit_b bit word

Answer 1

a SRAN Can etain its stbred infomation as long Fowe supplied >The 6 tsonsstor SRAM cell,stbring bit infomat One he SRAM cell mainly consist ob access sansisbrs Ythe word line oud he ittine The coord and bit, bit b ou used to eod ond wsite frome cetl or to he cel >h standay mede usord line is law tuning the access tiansistor ob The word line is used to addrees ard enable all memayuоovd., gle bit at boh he cuts ,b bits ot one we hen w onnot occes ha waite dato Phe cell e use Duod data fo or Mainly, bit and bit-b,br seod foomthe memory or onite sto the mern nkut while corite into bit and bit -b line aet Yhe memony and act as autait in while sueoct fm e mano as OUS

@ Read opecetion ot SRM cell woYd line (word)» activateol to close switches Ti and bit bi-b recharge both bitlines high One ob the too bit lines will be puled dlouorby theT cell Ex Ao andA-6= dischages ,it-o stayp high But A bumps ip slighty bit nsite apeation ob SRANcell She ther loo. high Drive he one bittine word line Then tum Bitlines ovebower Cell nith newValua Ex A-0, A b=1, b bit-1, bit-ba0 For te Ablow hen A rises hiq h