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# Computer Organisation Part 1

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Computer Organisation by Mukesh Upadhyay from Lachoo Memorial College Jodhpur

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### Computer Organisation Part 1

1. 2. SRAM Static Read Only Memory Curiosity . . . Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
2. 4. Working of Binary Cell (B.C.) <ul><li>Binary Cell is used to store 1 bit information. </li></ul><ul><li>R S Flip Flop is used to store that bit. </li></ul><ul><li>Binary Cell is Enabled only when Select=1 and if Select=0 than B.C. is disable. </li></ul><ul><li>And when Select=1 than all three AND gates in circuit are partial ON </li></ul><ul><li>When select=1 and </li></ul><ul><ul><li>In R/W if it is 1 than it will read the value. </li></ul></ul><ul><ul><ul><ul><ul><li>If it is 0 than it will write the value on it. </li></ul></ul></ul></ul></ul><ul><li>There is a Special AND gate(A3) tri-state gate (Gate having three states) </li></ul>Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
3. 7. 4X3 SRAM (Read Operation) BC BC BC BC BC BC BC BC BC BC BC BC D2 D1 D0 Din Dout D2 D1 D0 R/W 2 X 4 Decoder 0 0 1 1 1 0 0 1 1 = Read 0 = Write 00 01 10 11 a1 a2 a3 b1 b2 b3 c1 c2 c3 d1 d2 d3 Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
4. 8. 4X3 SRAM (Write Operation) D2 D1 D0 Din D2 D1 D0 R/W 1 = Read 0 = Write x z y Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com BC BC BC BC BC BC BC BC BC BC BC BC Dout 2 X 4 Decoder 0 0 1 1 1 0 0 1 00 01 10 11
5. 9. DRAM Dynamic Read Only Memory Sharp Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
6. 11. ROM Read Only Memory Adventure Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
7. 12. ROM 2X4 Decoder D2 D1 D0 Dout 0 1 1 1 0 1 1 1 00 01 10 11 Wired OR Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
8. 13. ROM 2X4 Decoder D2 D1 D0 Dout 0 0 1 0 1 0 1 1 00 01 10 11 After burning required diodes Required Sequence 010 011 101 001 Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
9. 14. This diode is reverse biased and therefore the flow of current is only the following direction Diagrammatically representation of diode But the following possibility is not present over this circumstances like shown in below figure Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
10. 15. Magnetic memories <ul><li>Magnetic Tape </li></ul><ul><li>Floppy disk </li></ul><ul><li>magnetic drum </li></ul>COOL Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
11. 16. Magnetic Tape Power of Colors Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
12. 18. Magnetic Tape Output waves Ferric oxide layer (Iron Practical) S N Diagrammatical representation of a single particle 0 1 Head Tail to strengthening in the signal (voltage or current) we use Amplifier Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com COIL + - Amplifier
13. 20. FLOPPY DISK Simplicity Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
14. 22. Cleaning Pads Krishna Kumar Bohra (KKB), MCA LMCST www.selectall.wordpress.com
15. 23.  contd…