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#1
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electronic memories capacity
Why electronic memory (eg. flash) capacity is 1, 4, 8, 16, 32, 64, 128
etc. I have read that it is function of some memory parameters, but i do not know which. Can anybody help me? |
#2
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" BILLING " + wrote in message
... Why electronic memory (eg. flash) capacity is 1, 4, 8, 16, 32, 64, 128 etc. I have read that it is function of some memory parameters, but i do not know which. Can anybody help me? It is just the technology they use to make it. Usually, they increase the number of transistors they can put on a chip by a factor of 4 every two years or so, and then they increase the memory capacity accordingly. It is not economical to increase it by a smaller factor most of the time. |
#3
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Adding 1 address line will increase addressable capacity by a factor of 4, i.e. twice as many columns and twice as many rows. "James H. Fox" wrote: " BILLING " + wrote in message ... Why electronic memory (eg. flash) capacity is 1, 4, 8, 16, 32, 64, 128 etc. I have read that it is function of some memory parameters, but i do not know which. Can anybody help me? It is just the technology they use to make it. Usually, they increase the number of transistors they can put on a chip by a factor of 4 every two years or so, and then they increase the memory capacity accordingly. It is not economical to increase it by a smaller factor most of the time. -- When replying by Email include NewSGrouP (case sensitive) in Subject Mike Walsh West Palm Beach, Florida, U.S.A. |
#4
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But only on devices with muxed address (DRAMs), not on flash devices (or do
some of these have multiplexed address inputs?). "Mike Walsh" wrote in message ... Adding 1 address line will increase addressable capacity by a factor of 4, i.e. twice as many columns and twice as many rows. "James H. Fox" wrote: " BILLING " + wrote in message ... Why electronic memory (eg. flash) capacity is 1, 4, 8, 16, 32, 64, 128 etc. I have read that it is function of some memory parameters, but i do not know which. Can anybody help me? It is just the technology they use to make it. Usually, they increase the number of transistors they can put on a chip by a factor of 4 every two years or so, and then they increase the memory capacity accordingly. It is not economical to increase it by a smaller factor most of the time. |
#5
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"Graeme" wrote in
: But only on devices with muxed address (DRAMs), not on flash devices (or do some of these have multiplexed address inputs?). You are correct. Flash, static-ram, eeprom, rom and others typically do not use muxed address pins. I've never seen them myself but I won't say absolutely that they they 'never' use muxed address pins. some niche part may do this but it is NOT common. Each additional address line/pin doubles the number of accessible addresses and so doubles the potential memory capacity. Its a binary thing. All forms of dynamic-ram (DRAM, SDRAM, DDRAM, etc.) are another story but again, each additional address bit will double the addressible memory and thus the potential memory capacity. |
#6
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JS wrote:
"Graeme" wrote in But only on devices with muxed address (DRAMs), not on flash devices (or do some of these have multiplexed address inputs?). You are correct. Flash, static-ram, eeprom, rom and others typically do not use muxed address pins. I've never seen them myself but I won't say absolutely that they they 'never' use muxed address pins. some niche part may do this but it is NOT common. Each additional address line/pin doubles the number of accessible addresses and so doubles the potential memory capacity. Its a binary thing. All forms of dynamic-ram (DRAM, SDRAM, DDRAM, etc.) are another story but again, each additional address bit will double the addressible memory and thus the potential memory capacity. There is a good reason for that. Dynamic rams need two cycles, one to address a row of bits, and the other to address a column. So they can only use 1/2 of the address at a time. The other devices want to address a particular address instantly, with no timing complexities. -- Chuck F ) ) Available for consulting/temporary embedded and systems. http://cbfalconer.home.att.net USE worldnet address! |
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