I'm mainly a software guy, with enough hardware prototyping experience to be dangerous I have an application I'm working on where I want to clock in serial data from a device at 4 Mb/s. I tried adding a shift register in, but I still get 4,000,000 / 8 interrupts per second to my poor little Coldfire cpu.

I'd like to incorporate a deep fifo in the mix so I can go out and read in a bunch of data once in awhile via dma on my data bus or whatever. Something like a "Serial to parallel fifo", like the IDT72142 would be pure gold, but it's obsolete, probably because everyone uses FPGAs nowadays. Does anyone know of a good way to clock serial data into a fifo, then pull it out in parallel (8 or 16 bit)? I was thinking about doing an FPGA, but I'd like to just drop in an IC and get this done.

Thanks !

 

Shift register. SIPO Serial In Parallel Out

Give this a read:
http://www.allaboutcircuits.com/vol_4/chpt_12/4.html

Here you go .50 cents a piece at 1 quantities.
http://www.mouser.com/ProductDetail...GAEpiMZZMutXGli8Ay4kE3wRMDwmh/%2bVm3dLLDkzXY=

 

Thanks for the reply. It could be that I'm lost, but I'm not sure that using a 74hc594 buys me much more than I already have. I'm already using a shift register (74hc164). I'd like to be able to buffer up at least 4Kbit so I only have to pull out data at 1ms periods.

I've got a:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=800-1507-5-ND

This is a neat 2048X9 fifo, but I can't get from my shift register into that, so I was hoping to find a fairly deep fifo I can populate serially.

 

It's kinda weird. There doesn't appear to be any SIPOs available anywhere, by anyone. It seems like there would at least be a market for these things.

 

It's kinda weird. There doesn't appear to be any SIPOs available anywhere, by anyone. It seems like there would at least be a market for these things.

That's because the capability is inherent in most programmable devices, manipulated with simple software routines/switches.