For the 7xxx -> http://developer.amd.com/afds/assets/presentations/2620_final.pdf page 10
You can find 6xxx specific stuff in here -> http://developer.amd.com/sdks/AMDAPPSDK/assets/AMD_HD_6900_Series_Instruction_Set_Architecture.pdf chapter 1,2
And here's a very good article about 5xxx, 6xxx and Fermi architectures -> http://www.realworldtech.com/page.cfm?ArticleID=RWT121410213827&p=5
The talk Ben Gaster and I gave at the OpenGPU workshop at HiPEAC in January might give what you need in a more compact form:
I need to use those slides to do an update of the university kit for an OpenCL course I'm due to teach later in the year so let us know if you have any feedback.