https://community.nxp.com/t5/i-MX-Processors/why-is-this-difference-in-memory-Mapped-and-port-mapped/m-p/721050#M112104 <HTML><HEAD></HEAD><BODY><P>Hi Aditya</P><P></P><P>this depends in internal processor architecture, as memory and port may</P><P>use different internal processor buses. Please check processor manual with</P><P>description of internal mapping of peripherals.</P><P></P><P>Best regards<BR />igor<BR />-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Wed, 25 Oct 2017 23:01:13 GMT igorpadykov 2017-10-25T23:01:13Z https://community.nxp.com/t5/i-MX-Processors/why-is-this-difference-in-memory-Mapped-and-port-mapped/m-p/721049#M112103 <HTML><HEAD></HEAD><BODY><P>Hi ,</P><P></P><P>In the memory mapped I/O interfacing , peripherals are connected/interfaced over the address bus. If there are 32 address lines , then theoretically we can interface 2 power 32 devices to the CPU. This interfacing also includes MEMR&nbsp; and MEMW (Memory Read and Memory write signals).</P><P>In the Port Mapped I/O interfacing , peripherals are again connected to the same address lines . Just the instructions for reading and writing would be different like inportb&nbsp; and outportb&nbsp; and the control signals would be IOR and IOW (IO READ and IO WRITE) . But the number of devices which can be interfaced will probably be less i.e. 2 power 16 .&nbsp;</P><P>Why is this difference between Memory Mapped I/O and Port Mapped I/O.&nbsp;</P><P></P><P>Regards,&nbsp;</P><P>Aditya Nagal</P></BODY></HTML> Wed, 25 Oct 2017 13:45:45 GMT https://community.nxp.com/t5/i-MX-Processors/why-is-this-difference-in-memory-Mapped-and-port-mapped/m-p/721049#M112103 adityanagal 2017-10-25T13:45:45Z https://community.nxp.com/t5/i-MX-Processors/why-is-this-difference-in-memory-Mapped-and-port-mapped/m-p/721050#M112104 <HTML><HEAD></HEAD><BODY><P>Hi Aditya</P><P></P><P>this depends in internal processor architecture, as memory and port may</P><P>use different internal processor buses. Please check processor manual with</P><P>description of internal mapping of peripherals.</P><P></P><P>Best regards<BR />igor<BR />-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Wed, 25 Oct 2017 23:01:13 GMT https://community.nxp.com/t5/i-MX-Processors/why-is-this-difference-in-memory-Mapped-and-port-mapped/m-p/721050#M112104 igorpadykov 2017-10-25T23:01:13Z