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Lec 40

The document discusses various types of memory in CMOS digital VLSI design, including Read Only Memories (ROM), Static RAM (SRAM), and Dynamic RAM (DRAM). It highlights the differences between volatile and non-volatile memories, as well as the factors influencing memory selection for specific applications. Additionally, it covers memory architecture and operation principles, referencing a key source for further details.

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11 views12 pages

Lec 40

The document discusses various types of memory in CMOS digital VLSI design, including Read Only Memories (ROM), Static RAM (SRAM), and Dynamic RAM (DRAM). It highlights the differences between volatile and non-volatile memories, as well as the factors influencing memory selection for specific applications. Additionally, it covers memory architecture and operation principles, referencing a key source for further details.

Uploaded by

arkhit
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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CMOS DIGITAL VLSI DESIGN

Concept of Memory and its Designing-II


SUDEB DASGUPTA
DEPARMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING

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 Array Structured Memory Organization

Source: J. M. Rabaey, A. Chandrakasan and B. Nikolic, “Digital Integrated Circuit,” PHI Learning Pvt. Ltd., 2011.

2
 Hierarchical Memory Architecture

Source: J. M. Rabaey, A. Chandrakasan and B. Nikolic, “Digital Integrated Circuit,” PHI Learning Pvt. Ltd., 2011.

3
The Memory Core
 Read only Memories

Source: J. M. Rabaey, A. Chandrakasan and B. Nikolic, “Digital Integrated Circuit,” PHI Learning Pvt. Ltd., 2011.

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 A 4×4 OR ROM Array

Source: J. M. Rabaey, A. Chandrakasan and B. Nikolic, “Digital Integrated Circuit,” PHI Learning Pvt. Ltd., 2011.

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 Non-volatile Read-Write Memories-

Floating-Gate Transistor EPROM Flash-EPROM

Source: J. M. Rabaey, A. Chandrakasan and B. Nikolic, “Digital Integrated Circuit,” PHI Learning Pvt. Ltd., 2011.

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 Read Write Memories (RAM)
• Storage in RAM memories is based on either positive feedback or
capacitive charge.
a) Static RAM

Source: J. M. Rabaey, A. Chandrakasan and B. Nikolic, “Digital Integrated Circuit,” PHI Learning Pvt. Ltd., 2011.

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 SRAM Read & Write Operation

Read Operation Write Operation

Source: J. M. Rabaey, A. Chandrakasan and B. Nikolic, “Digital Integrated Circuit,” PHI Learning Pvt. Ltd., 2011.

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b) Dynamic RAM

Source: J. M. Rabaey, A. Chandrakasan and B. Nikolic, “Digital Integrated Circuit,” PHI Learning Pvt. Ltd., 2011.

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Recapitulation
• The type of memory unit that us preferable for a given application is
a function of required memory size, the time it takes to access the
stored data, the access pattern, the application and the system
requirements.
• RWM belong to the class of volatile memory while ROM belongs to
the category of non-volatile memories.
• EPROM and E2PROM are the memories which offer both read and
write functionality even that are of non-volatile in nature.
• RAM can be classified as Static RAM and Dynamic RAM based on the
storage concept.
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Thank You

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