Latching address data with D flipflops

[Bruce Varley]

Hi, The usual arrangement for latching high order address bits with
microcontrollers is to use a latch, like an HC373. Is there any specific
reason why D flipflops, clocked from the trailing edge of the address strobe
signal, wouldn't do the job? TIA

 

[Vladimir Vassilevsky]

Hi, The usual arrangement for latching high order address bits with
microcontrollers is to use a latch, like an HC373. Is there any specific
reason why D flipflops, clocked from the trailing edge of the address strobe
signal, wouldn't do the job? TIA

With D flipflops clocked at the trailing edge, you have the valid
address on the bus only at the end of the address strobe, whereas with
the latch you have it from the beginning. That can be important for some
cases.

Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com

 

[Bob]

Hi, The usual arrangement for latching high order address bits with
microcontrollers is to use a latch, like an HC373. Is there any specific
reason why D flipflops, clocked from the trailing edge of the address strobe
signal, wouldn't do the job? TIA

Just off the top of my head, aren't '373s D-type latches?

Bob

 

[John Fields]

Just off the top of my head, aren't '373s D-type latches?