Paralel data trasfer between pics//memory

[TKS]

Hi,

i was wondering,

if you just hook up 2 pics whit lets say 6 pins.

and 4 of them you would use for data transfer??

the other 2 pins are control lines..

would i be possible to trafer a number for example 35 to the other pic??/

TKS

wich memory is generally used instead of a i2c eeprom and is faster???

i need to write and read very fast..(faster as 1ms)

 

[Nigel Goodwin]

Hi,

i was wondering,

if you just hook up 2 pics whit lets say 6 pins.

and 4 of them you would use for data transfer??

the other 2 pins are control lines..

would i be possible to trafer a number for example 35 to the other pic??/

You could, but it's far easier to do it via just one pin and use a serial transfer method, if you have PIC's with hardware USART's it's even easier. But even with a software UART it's still plenty fast enough for most purposes.

wich memory is generally used instead of a i2c eeprom and is faster???

i need to write and read very fast..(faster as 1ms)

It depends on what you are trying to do?, you can always simply connect a static RAM to a PIC, using the PIC pins to provide the address and data lines.

 

[TKS]

...

Can you give me a type of ram that is commonly used and has lets say
8Kb space??/

TKS

 

[Nigel Goodwin]

Re: ...

Can you give me a type of ram that is commonly used and has lets say
8Kb space??/

In the past the 6116 was popular, but it's only 2KB, I've got a larger one at home used in an EPE project, I'll look what the number on it is!.

 

[TKS]

mem

ok, the brand new//data sheet link would be very nice..

its for a excel sheet something...

i need speeds thats the only way to go..


TKS

 

[bmcculla]

Go to digikey.com and do a search on SRAM. You can use their great search utility to find the right ram chip. Parrallel ram is the fatest but SPI(or 3 wire) ram should be fast enough for a 1ms read and write even i2c ram should be fast enough.

 

[Nigel Goodwin]

The chip I used in the EPE project was an NEC D43256BCZ-70LL, it came from RS Components at http://rswww.com.

 

[TKS]

Thanxs Nigell

thanxs..

TKS

 

[TKS]

Nigel,

i found a nice chip on my big client TI :wink: :lol: :lol:

But where can i learn some more about the intern sturcture of memories.
Example: 8Kx8 means???

and i now that when i read out the pins (8 because of 8bit???)

i in fact do 2^1 2^2 2^3 2^4 2^5 etc.. and i make up that way the value right??

hope you can give me a page or good book about that stuff

TKS

 

[williB]

Nigel,

i found a nice chip on my big client TI :wink: :lol: :lol:

But where can i learn some more about the intern sturcture of memories.
Example: 8Kx8 means???

and i now that when i read out the pins (8 because of 8bit???)

i in fact do 2^1 2^2 2^3 2^4 2^5 etc.. and i make up that way the value right??

hope you can give me a page or good book about that stuff

TKS

8kX8 is a 64K chip organized as 8 bits wide X 8k long
some are just 4 bits wide ---while others are 32 bits wide..

 

[samcheetah]

Re: ...

Can you give me a type of ram that is commonly used and has lets say
8Kb space??/

In the past the 6116 was popular, but it's only 2KB, I've got a larger one at home used in an EPE project, I'll look what the number on it is!.

which project

 

[Nigel Goodwin]

Re: ...

Can you give me a type of ram that is commonly used and has lets say
8Kb space??/

In the past the 6116 was popular, but it's only 2KB, I've got a larger one at home used in an EPE project, I'll look what the number on it is!.

which project

It was a simple PIC oscilloscope, it uses a 16F877 to sample into the ram, then transfers to the PC via the parallel port.

 

[samcheetah]

It was a simple PIC oscilloscope, it uses a 16F877 to sample into the ram, then transfers to the PC via the parallel port.

which issue was it. of all the issues i have i could only find one oscilloscope project which came in the October 2000 issue. it also used the 16F877 but it used the TC55257DPL-85L 32K Byte SRAM.

 

[Nigel Goodwin]

It was a simple PIC oscilloscope, it uses a 16F877 to sample into the ram, then transfers to the PC via the parallel port.

which issue was it. of all the issues i have i could only find one oscilloscope project which came in the October 2000 issue. it also used the 16F877 but it used the TC55257DPL-85L 32K Byte SRAM.

I'd have to look back for the magazine, I read the chip number off the actual chip - I didn't use the same chip as the original design, it had been discontinued. I confirmed the one I did use was a suitable repalcement via email.