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Questions tagged [addressing]

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18
votes
6answers
1k views

Method for assigning unique per-board addresses

We're designing transmitter/receiver boards for an RF remote-control application. To avoid talk between mismatched pairs, we want unique per-board addresses. The address is specified to encoder/...
0
votes
2answers
524 views

How does using memory with more bits allow you to reduce the address bus?

If you are using a CPU to address one 2MB memory module, then since 1MB = 220 and 2·220 = 221 = 2MB, you need 21 address lines. If you use a 2MB 16-bit memory module instead, you can remove address ...
2
votes
3answers
878 views

Reducing the memory address bus by adding banks

If you are trying to control memory from a CPU, then if you use two banks instead of one, you can remove the first address line. If you use four banks, then you can also remove the second as well. Why ...
2
votes
1answer
3k views

Confused about I2C addressing in PCA8574/74A

The datasheet for the NXP PCA8574/74A contains the following line on addressing (p.6): When AD2, AD1 and AD0 are held to VDD or VSS, the same address as the PCF8574 or PCF8574A is applied. I'm ...