DS90UB954-Q1: SER_ALIAS_ID clarification

May

Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: DS90UB953-Q1,

Hi,

Customer have questions about SER_ALIAS_ID register (0x5C) in https://www.ti.com/lit/ds/symlink/ds90ub954-q1.pdf.

It has the following description "Configures the decoder for detecting transactions designated for an I2C secondary device attached to the remote Deserializer". The transaction is remapped to the address specified in the secondary ID register"

1) What does "decoder" refer to ?
2) What does "remote Deserializer" mean ? Is it supposed to be remote serializer ?
3) What is the application/example usage of this feature ?

Regards,
Maynard

over 3 years ago

+1 Shruti More over 3 years ago

TI__Expert 6345 points

Hello Maynard,

1 & 3. The decoder is to translate from the slave alias to the slave alias ID. Device Alias ID refers to the alternate 7-bit address assigned to either the serializer, deserializer, or
remote slave. The Device Alias can help differentiate devices that have the same Device ID or physical I2C address. For example, the DS90UB954-Q1 can support two serializers like the DS90UB953-Q1. If both serializers are 953s that are connected to the same camera, the device IDs and default alias IDs for the corresponding devices will be the same. As a result, the best practice is to write a unique alias ID to each device.

Please refer to the following app note for more information: https://www.ti.com/lit/an/snla222/snla222.pdf?ts=1635199842082&ref_url=https%253A%252F%252Fwww.google.com%252F

and section "2.2.1 Aliasing" on page 10 in this app note: https://www.ti.com/lit/an/snla267a/snla267a.pdf?ts=1635200163436&ref_url=https%253A%252F%252Fwww.google.com%252F

2. It's supposed to be remote serializer and this description will be updated for clarity in the future datasheet revision.

Best Regards,

Shruti

Interface

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DS90UB954-Q1: SER_ALIAS_ID clarification