Dear Forum
Figure 102 (I2C block addressing) of SLG468246 datasheet states A[10:8] = "00X" addresses "2 Kbits Register Data Configuration". Since the register address space has 8 bits only, I wonder what A[10:8] = "001" is used for (I2C ping shows the device actually acknowledges at this address).
Is this just reserved for future addressing of larger address spaces (totally 4 Kbits) and has not function behind it? Or does it have a specific function? If yes, which one? Any pitfall?
Thanks for your inputs in advance & best regards
Peter
Keywords:
Device:
Device Number:
SLG468246
Hi Peter,
GPAK addressing is slightly different than common I2C addressing. A[10:8] is used for choosing a memory block (see memory map)
please refer to the ISP documentation provided by Alex Richardson here:
https://support.dialog-semiconductor.com/forums/post/greenpak-and-greenf...
thanks and regards,
Pavlo
Hi Pavlo
I think I got the point pretty well: A[10:8], which selects the memory block is part of the slave address.
Since I found no answer to my question in your provided link, let me ask my question a little bit different.
In my case (Code = 5), the device responds to I2C ping on the following slave addresses:
- 0x28 : (A[10:8] = 00X in docu) According to docu access to 2048 bits (256 bytes) of register
- 0x29 : (A[10:8] = 00X in docu) According to docu access to 2048 bits (256 bytes) of register
- 0x2A : (A[10:8] = 010 in docu) According to docu access to 2048 bits (256 bytes) of NVM data configuration
- 0x2B : (A[10:8] = 011 in docu) According to docu access to 2048 bits (256 bytes) of EEPROM
My question: What is the difference accessing e.g. IO0 register (A[7:0] = 0x61) through slave address 0x28 or through 0x29 (both fullfill the requirement A[10:8] = 00X from the docu)?
Best regards,
Peter
Hi Peter,
the address A[10:8]=000 is specified as Register Data Configuration, but
the address A[10:8]=001 is specified as Not Used, that is the difference.
Thanks and regards,
Pavlo