FIFO ?

M

MichaelE

Guest
Can a FIFO IC that is 512 x 8 be used as a 2048x2 by series connecting in to out on 4 channels? It seems there shouldn't be any issues but I'm not sure. I'm considering IDT's 72210 series IC, I haven't seen any ICs with 1 or 2 bit widths and 2048 bits long.

Thanks
 
MichaelE wrote:

Can a FIFO IC that is 512 x 8 be used as a 2048x2 by series connecting
in to out on 4 channels? It seems there shouldn't be any issues but I'm
not sure. I'm considering IDT's 72210 series IC, I haven't seen any ICs
with 1 or 2 bit widths and 2048 bits long.

Thanks
Click to expand...
Check the setup and hold times for both input and output, but in theory
it should work. You'll need to connect 6 lines back around: DI2 to DO0,
DI3 to DO1, etc. Then you'd input on DI0 and 1, and get stuff out on
DO6 and 7.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
"Tim Wescott" <tim@wescottnospamdesign.com> wrote in message
news:10asuqqmbdhbv9b@corp.supernews.com...
MichaelE wrote:

Can a FIFO IC that is 512 x 8 be used as a 2048x2 by series connecting
in to out on 4 channels? It seems there shouldn't be any issues but I'm
not sure. I'm considering IDT's 72210 series IC, I haven't seen any ICs
with 1 or 2 bit widths and 2048 bits long.

Thanks

Check the setup and hold times for both input and output, but in theory
it should work. You'll need to connect 6 lines back around: DI2 to DO0,
DI3 to DO1, etc. Then you'd input on DI0 and 1, and get stuff out on
DO6 and 7.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Click to expand...
I don't think so. After you write the first 2 x 512 bits, the FIFO will be
full. To do any more writes, you would have to do a SO/SI. If a real read
now comes along, you won't know which bits to look at. This has been done
before, with multiplexers and 8 bit latches input and output. Only problem
is if the sending end stops completely.

Tam
 
Tam/WB2TT wrote:

"Tim Wescott" <tim@wescottnospamdesign.com> wrote in message
news:10asuqqmbdhbv9b@corp.supernews.com...

MichaelE wrote:


Can a FIFO IC that is 512 x 8 be used as a 2048x2 by series connecting
in to out on 4 channels? It seems there shouldn't be any issues but I'm
not sure. I'm considering IDT's 72210 series IC, I haven't seen any ICs
with 1 or 2 bit widths and 2048 bits long.

Thanks

Check the setup and hold times for both input and output, but in theory
it should work. You'll need to connect 6 lines back around: DI2 to DO0,
DI3 to DO1, etc. Then you'd input on DI0 and 1, and get stuff out on
DO6 and 7.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com


I don't think so. After you write the first 2 x 512 bits, the FIFO will be
full. To do any more writes, you would have to do a SO/SI. If a real read
now comes along, you won't know which bits to look at. This has been done
before, with multiplexers and 8 bit latches input and output. Only problem
is if the sending end stops completely.

Tam
Click to expand...
Oh damn. You're right. The only time that FIFOs and I crossed paths
was in a fixed delay line, where the reads and writes happened
simultaneously -- so I kinda forgot that you could do it asynchronously...

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
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