I am looking for a small low cost asynchronous dual port RAM. Cypress and IDT devices are too big and expensive. Is there anything smaller/cheaper? I need only 128 bits (16x8). Best regards
Tiny dual port RAM needed
Started by ●June 2, 2005
Reply by ●June 2, 20052005-06-02
A $1.00 CPLD from Xilinx or Altera would do the job. You would just have to code up a little VHDL or Verilog to define the dual port ram function. Eric
Reply by ●June 2, 20052005-06-02
Eric wrote:> A $1.00 CPLD from Xilinx or Altera would do the job. You would just > have to code up a little VHDL or Verilog to define the dual port ram > function.I predict he'll need a macrocell per bit and it will cost him more like $3 per part. It will still be the best solution though.
Reply by ●June 2, 20052005-06-02
On Thursday, in article <d7nnn6$b72$1@sunce.iskon.hr> davor.s@iname.com "Davor.S" wrote:>I am looking for a small low cost asynchronous dual port RAM. >Cypress and IDT devices are too big and expensive. >Is there anything smaller/cheaper? I need only 128 bits (16x8).Code it into a PLD/FPGA, Altera and Xilinx have standard logic cells for dual port RAM, just get one with enough D types or memory bits. All depends on how fast an access speed and size of package is actually 'small' that you need. Let alone 5V or 3V3, power budget and cost. If you can find an equivalent part for the National 74F410, you could use smaller PLD to do the dual porting of two devices giving you 16 x 8 RAM/register file from two 16 x 4 devices. There seem to be several suppliers of the 4 x 4 register file 74HC670 series. This would need four devices. Buying small size memory for LUTs and similar is getting more difficult. If the data is loaded once (or infrequently) but read from both sides, you could pipeline the data into a Logic Devices L29C525 and hold the data for reading. As we don't what you are trying to dual port an what for these are only outline suggestions I would give at this stage. -- Paul Carpenter | paul@pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.gnuh8.org.uk/> GNU H8 & mailing list info <http://www.badweb.org.uk/> For those web sites you hate
Reply by ●June 2, 20052005-06-02
Davor.S wrote:> I am looking for a small low cost asynchronous dual port RAM. > Cypress and IDT devices are too big and expensive. > Is there anything smaller/cheaper? I need only 128 bits (16x8). > > Best regardsThat is a hole in the market. There are smaller sized Dualports, but they tend to be old, and priced like 2716 EPROMS :) Dallas used to have a 4 port serial memory, and they still have a 2404 serial Dual port, and DS1609 is parallel dual port, but that is tagged not for new designs, tho you can still buy them... Alternatives would be CPLD, but that would use many macrocells, small FPGA, or maybe you could adapt to use a couple of HCMOS FIFOs - those are still active devices ? -jg
Reply by ●June 2, 20052005-06-02
Take a look at the various cmos clocks. Many of these have some ram included. Hul Davor.S <davor.s@iname.com> wrote:> I am looking for a small low cost asynchronous dual port RAM. > Cypress and IDT devices are too big and expensive. > Is there anything smaller/cheaper? I need only 128 bits (16x8).> Best regards
Reply by ●June 3, 20052005-06-03
"Davor.S" <davor.s@iname.com> skrev i meddelandet news:d7nnn6$b72$1@sunce.iskon.hr...>I am looking for a small low cost asynchronous dual port RAM. > Cypress and IDT devices are too big and expensive. > Is there anything smaller/cheaper? I need only 128 bits (16x8). > > Best regards >The soon to be available AT94K05AX will give you six 32 x 8 DPRAM, and an AVR microcontroller in 8 x 8 mm. There is already silicon on the AT94K10AX which gives you more and is more expensive. -- Best Regards, Ulf Samuelsson This is intended to be my personal opinion which may, or may bot be shared by my employer Atmel Nordic AB
Reply by ●June 3, 20052005-06-03
Bad suggestion below, sorry. I missed "dual port". Hul Hul Tytus <ht@panix.com> wrote:> Take a look at the various cmos clocks. Many of these have some ram > included.> Hul> Davor.S <davor.s@iname.com> wrote: > > I am looking for a small low cost asynchronous dual port RAM. > > Cypress and IDT devices are too big and expensive. > > Is there anything smaller/cheaper? I need only 128 bits (16x8).> > Best regards
Reply by ●June 5, 20052005-06-05
Reply by ●June 6, 20052005-06-06