ASIC with RAM

[padmow]

Greetings,

I wonder if anyone can help. I need ASIC chip which contain at least
64KB of RAM, keyboard interface.

Any estimates of how much it is also appreciated

thank you in advance
Padmow

 

[Ian Stirling]

Greetings,

I wonder if anyone can help. I need ASIC chip which contain at least
64KB of RAM, keyboard interface.

Any estimates of how much it is also appreciated

Why?
Do you mean an actual ASIC, which would typically be in volumes of
millions, completely custom, or would something generic work?

 

[Fred Bloggs]

Greetings,

I wonder if anyone can help. I need ASIC chip which contain at least
64KB of RAM, keyboard interface.

Any estimates of how much it is also appreciated

That would be something like this:
http://www.dolphin.fr/flip/ragtime/035/ragtime_035_products.html
-although you most likely don't know what you're asking.

 

[Luhan Monat]

Greetings,

I wonder if anyone can help. I need ASIC chip which contain at least
64KB of RAM, keyboard interface.

Any estimates of how much it is also appreciated

thank you in advance
Padmow

I think this guy is looking for a single board computer or development
system.

Nomination: This months "What the heck is this about?" award.

 

[padmow]

I think, it should be completely custom.

I imagine the chip should contain:

64KB SRAM

keyboard interface which can buffer 128 character from IBM PC keyboard
in the SRAM

I/O to 8bit CPU

8bit I/O to obtain data directly from certain address in SRAM


is it possible to have 64KB of SRAM in ASIC, I'm not sure about that.

anyway thanks in advance
Padmow

 

[Luhan Monat]

I think, it should be completely custom.

I imagine the chip should contain:

64KB SRAM

keyboard interface which can buffer 128 character from IBM PC keyboard
in the SRAM

I/O to 8bit CPU

8bit I/O to obtain data directly from certain address in SRAM


is it possible to have 64KB of SRAM in ASIC, I'm not sure about that.

anyway thanks in advance
Padmow

Nice on such details, but you have not said what it is supposed to do.

 

[Nico Coesel]

I think, it should be completely custom.

I imagine the chip should contain:

64KB SRAM

keyboard interface which can buffer 128 character from IBM PC keyboard
in the SRAM

I/O to 8bit CPU

8bit I/O to obtain data directly from certain address in SRAM


is it possible to have 64KB of SRAM in ASIC, I'm not sure about that.

Why create an ASIC? The PC keyboard signals are easely handled by a
microcontroller or a DSP. You can still get a single chip solution.

 

[padmow]

DSP solution is interesting, how much RAM can we get.

 

[padmow]

this is connected to a microprocessor. so we can have 2 chip solution.

 

[Rich Grise]

this is connected to a microprocessor. so we can have 2 chip solution.

I wish you would learn to include some context. Here's what you said that
your spec. is:
----------------
I think, it should be completely custom.
I imagine the chip should contain:
64KB SRAM
keyboard interface which can buffer 128 character from IBM PC keyboard
in the SRAM
I/O to 8bit CPU
8bit I/O to obtain data directly from certain address in SRAM
is it possible to have 64KB of SRAM in ASIC, I'm not sure about that.
------------------

So you want a two-chip solution, and you seem convinced that the only
way to achieve
+ "keyboard interface w/128K buffer" (which you don't say
is supposed to be within that 64K or not)
+ 8 bits of I/O
+ Interface to the RAM

is with some nebulous "ASIC".

What's preventing you from just getting a 64K RAM chip, and a micro
that has enough pins to just address it and do your I/O and buffering?

Thanks,
Rich

 

[Nico Coesel]

DSP solution is interesting, how much RAM can we get.

There are DSPs with 256kB. The problem is finding one in a small
package with flash and the amount of RAM you want. I recommend looking
at Texas Intruments and Analog Devices. How much speed do you think
you need?

 

[padmow]

when the external Microprocessor accessing the RAM, I would prefer it
is done by pure hardware. faster and simpler I think

Padmow

 

[Ian Stirling]

when the external Microprocessor accessing the RAM, I would prefer it
is done by pure hardware. faster and simpler I think

Cheaper, if you're building a hundred thousand.
Not faster, unless you need 100s of MB/second maybe simpler.
Otherwise, it's going to be cheaper to either go discrete, or to pick a
general purpose micro that's got enough internal RAM.