Looking for a SPI to multiplexed adress/data bus 'bridge'

T

Thomas Heller

Guest
Good afternoon,

I need to replace the 80186 compatible CPU on a design from us
by a more modern CPU module that has no data bus but an SPI
interface.

I found some SPI-IO expander chips, I could probably use
a simple CPLD, but a ready-to-use bridge chip that converts
to a 8-bit multiplexed data/address bus would be very nice.

Does anyone know of such a chip?

Thanks,
Thomas
 
On Mar 24, 11:43 am, Thomas Heller <thel...@python.net> wrote:
Good afternoon,

I need to replace the 80186 compatible CPU on a design from us
by a more modern CPU module that has no data bus but an SPI
interface.

I found some SPI-IO expander chips, I could probably use
a simple CPLD, but a ready-to-use bridge chip that converts
to a 8-bit multiplexed data/address bus would be very nice.

Does anyone know of such a chip?

What *exactly* do you want to interface to? Why doesn't the I/O
Click to expand...
expander work for you?
 
keithw86@gmail.com schrieb:
On Mar 24, 11:43 am, Thomas Heller <thel...@python.net> wrote:
Good afternoon,

I need to replace the 80186 compatible CPU on a design from us
by a more modern CPU module that has no data bus but an SPI
interface.

I found some SPI-IO expander chips, I could probably use
a simple CPLD, but a ready-to-use bridge chip that converts
to a 8-bit multiplexed data/address bus would be very nice.

Does anyone know of such a chip?

What *exactly* do you want to interface to? Why doesn't the I/O
expander work for you?
Click to expand...
I want to achive higher data rates than I can get with byte-banging (?)
the IO-port.

Several devices are connected to the bus, among them an ADC, a DAC,
and a couple of FPGAs.
 
"Thomas Heller" <theller@python.net> schreef in bericht
news:80utplF18qU1@mid.individual.net...
Good afternoon,

I need to replace the 80186 compatible CPU on a design from us
by a more modern CPU module that has no data bus but an SPI
interface.

I found some SPI-IO expander chips, I could probably use
a simple CPLD, but a ready-to-use bridge chip that converts
to a 8-bit multiplexed data/address bus would be very nice.

Does anyone know of such a chip?

Thanks,
Thomas
Click to expand...
Can't imagine a CPU without a databus. So I think you'll have to be more
specific about your needs.

petrus bitbyter
 
do you mean 16 bit MCU ?




"Thomas Heller" <theller@python.net> ???
news:80utplF18qU1@mid.individual.net ???...
Good afternoon,

I need to replace the 80186 compatible CPU on a design from us
by a more modern CPU module that has no data bus but an SPI
interface.

I found some SPI-IO expander chips, I could probably use
a simple CPLD, but a ready-to-use bridge chip that converts
to a 8-bit multiplexed data/address bus would be very nice.

Does anyone know of such a chip?

Thanks,
Thomas
Click to expand...
 
townt.com schrieb:
do you mean 16 bit MCU ?
Click to expand...
Yes, but an 8-bit data bus would be sufficient.

"Thomas Heller" <theller@python.net> ???
news:80utplF18qU1@mid.individual.net ???...
Good afternoon,

I need to replace the 80186 compatible CPU on a design from us
by a more modern CPU module that has no data bus but an SPI
interface.

I found some SPI-IO expander chips, I could probably use
a simple CPLD, but a ready-to-use bridge chip that converts
to a 8-bit multiplexed data/address bus would be very nice.

Does anyone know of such a chip?

Thanks,
Thomas
Click to expand...
 
http://www.microchip.com/

Microchip support 8, 16, 32 but MCU

I cannot sure, are you looking for 80x86 with data bus?


"Thomas Heller" <theller@python.net> ???
news:810tfvFvluU1@mid.individual.net ???...
townt.com schrieb:
do you mean 16 bit MCU ?

Yes, but an 8-bit data bus would be sufficient.

"Thomas Heller" <theller@python.net> ???
news:80utplF18qU1@mid.individual.net ???...
Good afternoon,

I need to replace the 80186 compatible CPU on a design from us
by a more modern CPU module that has no data bus but an SPI
interface.

I found some SPI-IO expander chips, I could probably use
a simple CPLD, but a ready-to-use bridge chip that converts
to a 8-bit multiplexed data/address bus would be very nice.

Does anyone know of such a chip?

Thanks,
Thomas
Click to expand...
 
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