TI E2E Community
Stellaris® ARM® Microcontrollers
Stellaris® ARM® LM3S Microcontrollers Forum
Reg:Address shifting with EPI interface
I am working on LM3S9B96 ARM cortexM3 controller.I am trying to access external peripheral(FLASH) through EPI (External Peripheral Interface).
I configured EPI in 16-bit mode and i am assigning Flash base address as 0x60000001.I am getting chip select and all ,According to base address A0 pin from controller should be high but it is not going high.
when i am assigning Flash base address as 0x60000002 then A0 going high and A1 remains low.
Based on above criteria some address shifting is happening .Because of that i am unable to access Flash correctly.
can anybody tell me the causes of problem and as well as solution
pls do the needful
When running in 16 bit mode half word accesses are used. A0 at the pin represents the internal A1 of the core, hence 0xXXXXXXX2 is A2 internal = A1 external = 0, A1 internal = A0 external = 1. Based on this you can connect directly to 16 bit wide memories.
Hope this helps.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.