SRC4382

Charles Pickers

Other Parts Discussed in Thread: SRC4382

Hi,

I'm currently designing an interface to control some SRC4382 Sample rate converters over SPI, and I'd like to clarify something in the datasheet regarding User and Channel status insertion. In the Digital Interface Transmitter section (page 28), the datasheet appears to suggest that control register 0x09 is the only register that needs setting to the appropriate source. However, in the control register applications information part of the datasheet (page 55), control register 0x08 has a bit labelled TXBTD which enables/disabled transfers from the User Access buffers to the Transmit buffers.

My initial understanding was that I would be able to update the buffers without driving the TXBTD bit in register 0x08, assuming that I didn't process updates during the Block Start where presumably the buffer transfer occurs? Is this correct, or do I need to explicitly disable and re-enable transfers to the Transmit buffer during each update?

Best regards,

Charles.

over 13 years ago

0 Don Dapkus over 13 years ago

TI__Guru**** 189401 points

Hi, Charles,

This is only an issue if you want to update the channel status (C) and user (U) data.

-d2

0 Charles Pickers over 13 years ago in reply to Don Dapkus

Prodigy 30 points

Hi Don,

Yes, I need to pass the Channel status and User bits through the SRC4382, and so I need to insert the data into these buffers. What I'm not sure about is whether I can configure the control registers to allow continuous access to the buffers over SPI and then simply write/read the U and C data, or whether I have to drive control register 0x08's TXBTD enable bit before and after each transaction?

Thanks,

Charles.

0 Patrick Galvin over 13 years ago in reply to Charles Pickers

TI__Genius 16270 points

Charles,

The 0x08 TXBTD bit should be updated for each transaction. Register 0x09 determines how they will be updated, but the disable bit is still needed to make the update.

0 Charles Pickers over 13 years ago in reply to Patrick Galvin

Prodigy 30 points

Thanks very much Patrick, that's good to know.

Best regards,

Charles.

Audio

Audio forum

SRC4382