Total memory needed in EEPROM?

Question

Hi, 
 I'm just wondering how can I find out how much memory I really need for my finished project in the EEPROM. 
 We have a design where we switch from the 1702 to the 1701 that has more processing power. 
 Further we have an 8kB EEPROM in the design for self-booting the device that should not be changed for the 1701. 
 The data sheet says that normally an 8kB should be sufficient for the 1701 (for the 1702 it's not a problem). 
 1) Is it simply program memory x4 Bytes + parameter memory x5 Bytes (if I do not use any writeback / interface registers)? 
 2) Can the "E2Prom.Hex" file give me the correct size? E.g. my "E2Prom.Hex" has 1012 line x8 Bytes so I need 8096 bytes total? What if more that 8192 bytes would be needed, will the "E2Prom.Hex" then have more than 1024 lines? Would there be an error message when I try to write such a project to the EEPROM? 
 Thanks 
 Christian

ADIApproved · Accepted Answer

Hi Christian, 
 In the case of the ADAU1701, the full program RAM needs to be downloaded each time (regardless of the program size), because the program counter is hardware-based, not software based. So, you'll always need 1024 * 5 = 5120 bytes for program memory. You'll also need a core register write at the beginning and end of the download (2 bytes each, 4 bytes total), and 24 bytes for register configuration. 
 The parameter memory, however, is totally program-dependent. You could theoretically have a really simple program (input-to-output) with no parameters. On the other hand, you could potentially use the entire 1k parameter memory for 4096 bytes. However, most programs will fall between these two extremes. 
 The EEPROM image includes some overhead for write commands and subaddresses, so that will add on roughly 20 bytes to the total. 
 I think checking the "E2Prom.Hex" file size (#2 in your original post) is the best method. You should be able to use the (number of lines)*(bytes per line) calculation to determine the total size.)

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Total memory needed in EEPROM?