Mobile Examination HW / SW Considerations Pt2
The design of memory allocation and chips in telephones may not follow a prescribed standard. However, memory is an important aspect for communications devices and an example of one telephone memory allocation in 1983 was given in Mobile Examination HW / SW Considerations Pt1 - http://www.trewmte.blogspot.co.uk/2012/10/mobile-examination-hw-sw-considerations.html.
Our interest, of course, is in mobile devices and their memory. Developments have moved us along in technology terms where we have passed through the analogue mobile phone era and into the digital era. It could be laborious for readers to be treated to a discussion about analogue mobile memory given its expiration and therefore we need to fast forward to 1996 to glimpse at memory and chipsets for GSM mobile phones. Detail from a presentation at Handset '97 Technology Conference by National Semiconductors usefully illustrates memory allocation and chips, as shown in the image below.
Perhaps of interest is the reference to six chips plus memory. Memory as we may commonly understand it to be can be both EEPROM and Flash. There other memory types but I don't want to stray from the discussion topic as reference to other types of memory would add nothing at this stage. We understand from Mobile Examination HW / SW Considerations Pt1 that E2PROM can be a memory of choice for electronic telephones. We see memory in use back in 1996 as observed by National Semiconductors for GSM using EEPROM and Flash. The relevance of how they were used and what went in them is of historical fact which we need not focus on that. The purpose of the observations in the National Semiconductor 1997 presentation concerned how improvements in silicon technology was enabling the possibility for even smaller scale manufacturing and to forecast how small scale integration would impact on memory and chips for future digital GSM mobile phones (see image below)
The future foreseen by National Semiconductors was the reduction in the number of chips used in mobile phones. Memory sources EEPROM and Flash are still integral requiremengts but remain separate memory allocation; and of course RAM can now be referred to. It was not shown in the earlier material above.
In the decade that followed year 2000 and up-to-date more changes and smaller scale integration has occurred. This will be considered in the next discussion so that the topic can progress towards the objective about considerations relevant to hardware and software and revelation about areas of memory that haven't been fully investigated or explored yet.