OMAP4430 IRQ handling behavior for SLIMBUS Shared Message Receive UNDERFLOW event.

Marc Butler

Other Parts Discussed in Thread: TWL6041, TWL6040

Hi,

In OMAP4430 TRM (SWPU231W) section 23.9.5.1.7 specifically states that the IRQ status bit should be cleared before servicing the relevant information register.

However, experimentation has show that when handling the UNDERFLOW event (bit 1) if the IRQ status bit is cleared before clearing this the INFO event bit, the interrupt is re-triggered.

Does this represent an exception to algorithm in section 23.9.5.1.7?

Thanks, Marc

over 14 years ago

0 Shaheen Saroor over 14 years ago

TI__Intellectual 1310 points

Slimbus has been descoped from OMAP4430/60 (i.e.; not supported by our SW or used on any of our reference HW). This interface has also been removed from OMAP4470. You should not use this interface on your design.

0 Marc Butler over 14 years ago in reply to Shaheen Saroor

Prodigy 20 points

Shaheen,

Are you able to give any reason why Slimbus has been descoped? Also I see that the OMAP5 has a Slimbus interface, will that be similar hardware interface?

Thanks, Marc

0 Soren Steen Christensen over 14 years ago in reply to Shaheen Saroor

Genius 3685 points

Hi Shaheen,

Sure it has been removed from 4470? Any recent change? According to latest 4470 DM I have seen (Version C from March) both SlimBus1 and 2 are still present in 4470? This being said I recall some time back having seen a document suggesting that Slimbus should maybe be cut for 4470, but as far as I'm able to tell it has never been done and are therefore still present? I however fully agree that it has been descoped from TI SW deliveries, but that's another story :-)

Can you please confirm if/that my understanding is correct or let us know where updated DM/information can be found?
Søren

0 Michael Oehrlein over 14 years ago in reply to Soren Steen Christensen

TI__Prodigy 460 points

Soren,

Yes, your understanding is correct; it is still present in the4470 DM, vD. It is also present in the OMAP5430 vA DM. However, in the OMAP5432 DM vA, only Slimbus1 is present.

Kind regards,

0 Soren Steen Christensen over 14 years ago in reply to Michael Oehrlein

Genius 3685 points

Hi Mike,

Thanks for your feedback. Nice to know that my understanding was right :-)

On a side note I just checked http://www.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?templateId=6123&navigationId=12864&contentId=103103 for OMAP5432 which show that SLIMbus is connected to TWL6040. AFAIK TWL6040 doesn't support Slimbus, so I guess you might consider getting this corrected/updated (and maybe updated to TWL6041 as well, although I don't know which part (40 or 41) is main recommendation for OMAP5 I have to admit)? Same SLIMBus connection is shown on the picture on the OMAP5430 page BTW...

Best regards
Søren

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OMAP4430 IRQ handling behavior for SLIMBUS Shared Message Receive UNDERFLOW event.