Part Number: TLV320AIC3104
I have a Texas TLV320AIC3104EVM board and am trying to connect the LINE2R input to RIGHT_LOP using the analog input bypass pathway as per section 10.4 of the datasheet.
So in the 'Bypass Paths' tab I select 'LINE2R - Bypass' which generates a message in the 'Command Buffer' tab :
w 30 6C 80
As I understand the data sheet correctly, this should result in the signal I put into MIC2R/LINE2R coming out at RIGHT_LOP.
But I get nothing out which I don't know why.
The other issue is the command sent down the I2C, hex 80 is sent to register 108 but the data sheet, page 74, says bit 7 is reserved and bit 6 should be set to enable LINE2R bypass.
Is the data sheet in error?
Any help would be appreciated.
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In reply to Steve-Wilson:
Thanks for the response.
I have checked the RIGHT_LOP output and it was switched off but I can't see any signal on any of the outputs unless it is severely attenuated.
My register configuration is:
I i2cstdr 30 00 10Read request succeededStarting at 30 00: 00 00 00 10 04 00 00 80 00 00 00 01 00 00 00 80r 30 10 10Read request succeededStarting at 30 10: 80 FF FF 78 78 78 78 78 78 06 00 FE 00 D0 A0 00r 30 20 10Read request succeededStarting at 30 20: 00 50 00 00 01 00 00 00 00 00 00 80 80 00 00 00r 30 30 10Read request succeededStarting at 30 30: 00 00 00 04 00 00 00 00 00 00 04 00 00 00 00 00r 30 40 10Read request succeededStarting at 30 40: 00 04 00 00 00 00 00 00 04 00 00 00 00 00 00 00r 30 50 10Read request succeededStarting at 30 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 78 00 00r 30 60 10Read request succeededStarting at 30 60: 00 00 00 00 00 00 02 00 00 00 00 04 80 00 00 00
Since I posted this issue I have routed :
'LINE2R -> RIGHT PGA -> RIGHT_LOP'
and can see my input appearing on RIGHT_LOP. But I can't see why the bypass 'LINE2R->RIGHT_LOP' doesn't work.
In reply to Tunstall_User:
Why do you say register 0x6c is not showing any configuration? The data I sent:
r 30 60 10Read request succeededStarting at 30 60: 00 00 00 00 00 00 02 00 00 00 00 04 80 00 00 00
shows that it is set to 0x80.
Are you saying that bit 7 of 0x80 is not a bypass bit and bit 6 should be set as per the data sheet for register 108?
If so, that is precisely my problem. As my initial post details, if I set 'LINE2R' bypass on the 'Bypass Paths' tab, TLC320AIC3014EVM shows a message:
w 30 6C 80
which according to the data sheet for the TLV320AIC3104 register 108 is setting reserved bit 7 not the bypass bit which is bit 6.
I did try setting bit 6 manually but it made no difference, no output appears on RIGHT_LOP.
The evaluation tool software I am running is version 'V1.0.0 - 01 June 2007'.
I tried your suggestion and the 'Command Line Interface' did indeed show 0x40 been written - 'w 30 6C 40'.
However there is still no output on RIGHT_LOP.
As I mentioned before, I did try writing 0x40 manually in the 'Command Line Interface' and it didn't work then either so I would have been really confused if selecting 'Line2RM' worked.
So the situation is as before, bypass doesn't seem to work but
'LINE2R -> RIGHT PGA -> RIGHT_LOP'
does work, with the input appearing on RIGHT_LOP.
So why doesn't bypass work? has anyone got it to work?
As for the GUI, version 1.1.1, I downloaded it from the EVM Texas website yesterday. I don't know the history of the one I was using, it was installed before my time on an old laptop to get round some driver issues or so I have been told.
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