DMA Chaining on TS101

Hello, I have a quick question concerning setting up DMA for chaining.
When
doing a DMA from internal memory to external memory you need to setup
2-TCBs,
one Source and one for Destination. In both TCBs you can give it the
next TCB to execute. Now when you do a link port DMA only 1-TCB needs
to be setup. How can I set that TCB up so when the DMA is finished it
can call another DMA to transfer DSP memory to external memory? The
link port TCB can only define one chain pointer, I need to have the
link port TCB to start the SourceTCB and DestinTCB of the next DMA I
want to do.

Here's my code:

// SETTING TCB DP REG::       -----  CHAIN POINTER ---                
DMA_DSP2IODAT_TCB.DP       = (((long)(&DMA_DSP2SONET_SourceTCB) >> 2)
& 0x7fff)

DMA_DSP2SONET_SourceTCB.DP = (((long)(&DMA_SONET2DSP_SourceTCB) >> 2)
& 0x7fff)
DMA_DSP2SONET_DestinTCB.DP = (((long)(&DMA_SONET2DSP_DestinTCB) >> 2)
& 0x7fff)

The DMA_DSP2IODAT_TCB should be chained to DMA_DSP2SONET_SourceTCB and
DMA_DSP2SONET_DestinTCB, or after my DMA from the link
port(DMA_DSP2IODAT_TCB)
I want to do a DMA from DSP memory to external memory. Any ideas how
this can be done?

joe

"joe" <jjlindula@hotmail.com> wrote in message
news:880397ee.0410191549.3bbf5e1b@posting.google.com...
> Hello, I have a quick question concerning setting up DMA for chaining.
> When
> doing a DMA from internal memory to external memory you need to setup
> 2-TCBs,
> one Source and one for Destination. In both TCBs you can give it the
> next TCB to execute. Now when you do a link port DMA only 1-TCB needs
> to be setup. How can I set that TCB up so when the DMA is finished it
> can call another DMA to transfer DSP memory to external memory? The
> link port TCB can only define one chain pointer, I need to have the
> link port TCB to start the SourceTCB and DestinTCB of the next DMA I
> want to do.

From what I understand of the SHARCs (I don't know details of the
TigerSHARCs specifically), you don't need 2 TCBs to specify a source and
destination. You should be able to specify that in 1 TCB - in the 21160 for
example, in a DMA between internal and external memory, you can specify the
internal addresses in the IIx, IMx, ICx registers and the external addresses
in the EIx, EMx, ECx registers. All of these are loaded from a single TCB.

Cheers
Bhaskar

>
> Here's my code:
>
> // SETTING TCB DP REG::       -----  CHAIN POINTER --- 
> DMA_DSP2IODAT_TCB.DP       = (((long)(&DMA_DSP2SONET_SourceTCB) >> 2)
> & 0x7fff)
>
> DMA_DSP2SONET_SourceTCB.DP = (((long)(&DMA_SONET2DSP_SourceTCB) >> 2)
> & 0x7fff)
> DMA_DSP2SONET_DestinTCB.DP = (((long)(&DMA_SONET2DSP_DestinTCB) >> 2)
> & 0x7fff)
>
> The DMA_DSP2IODAT_TCB should be chained to DMA_DSP2SONET_SourceTCB and
> DMA_DSP2SONET_DestinTCB, or after my DMA from the link
> port(DMA_DSP2IODAT_TCB)
> I want to do a DMA from DSP memory to external memory. Any ideas how
> this can be done?
>
> joe

Hi,

you might want to read the silicon errata sheet before messing with DMA on 
the TS101 there are several silicon bugs surronding it.

From what i can remember.

1. Dont DMA more that 1 channel to sdram or the DMA engine will hang
2. DMA Chaining is broken for link ports.

but you would need to check that from ADI

	James

On 19 Oct 2004, joe wrote:

> Hello, I have a quick question concerning setting up DMA for chaining.
> When
> doing a DMA from internal memory to external memory you need to setup
> 2-TCBs,
> one Source and one for Destination. In both TCBs you can give it the
> next TCB to execute. Now when you do a link port DMA only 1-TCB needs
> to be setup. How can I set that TCB up so when the DMA is finished it
> can call another DMA to transfer DSP memory to external memory? The
> link port TCB can only define one chain pointer, I need to have the
> link port TCB to start the SourceTCB and DestinTCB of the next DMA I
> want to do.
> 
> Here's my code:
> 
> // SETTING TCB DP REG::       -----  CHAIN POINTER ---                
> DMA_DSP2IODAT_TCB.DP       = (((long)(&DMA_DSP2SONET_SourceTCB) >> 2)
> & 0x7fff)
> 
> DMA_DSP2SONET_SourceTCB.DP = (((long)(&DMA_SONET2DSP_SourceTCB) >> 2)
> & 0x7fff)
> DMA_DSP2SONET_DestinTCB.DP = (((long)(&DMA_SONET2DSP_DestinTCB) >> 2)
> & 0x7fff)
> 
> The DMA_DSP2IODAT_TCB should be chained to DMA_DSP2SONET_SourceTCB and
> DMA_DSP2SONET_DestinTCB, or after my DMA from the link
> port(DMA_DSP2IODAT_TCB)
> I want to do a DMA from DSP memory to external memory. Any ideas how
> this can be done?
> 
> joe
> 

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"Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message news:<2tlp66F21if97U1@uni-berlin.de>...
> "joe" <jjlindula@hotmail.com> wrote in message
> news:880397ee.0410191549.3bbf5e1b@posting.google.com...
> > Hello, I have a quick question concerning setting up DMA for chaining.
> > When
> > doing a DMA from internal memory to external memory you need to setup
> > 2-TCBs,
> > one Source and one for Destination. In both TCBs you can give it the
> > next TCB to execute. Now when you do a link port DMA only 1-TCB needs
> > to be setup. How can I set that TCB up so when the DMA is finished it
> > can call another DMA to transfer DSP memory to external memory? The
> > link port TCB can only define one chain pointer, I need to have the
> > link port TCB to start the SourceTCB and DestinTCB of the next DMA I
> > want to do.
> 
> From what I understand of the SHARCs (I don't know details of the
> TigerSHARCs specifically), you don't need 2 TCBs to specify a source and
> destination. You should be able to specify that in 1 TCB - in the 21160 for
> example, in a DMA between internal and external memory, you can specify the
> internal addresses in the IIx, IMx, ICx registers and the external addresses
> in the EIx, EMx, ECx registers. All of these are loaded from a single TCB.
> 
> Cheers
> Bhaskar
> 
> >
> > Here's my code:
> >
> > // SETTING TCB DP REG::       -----  CHAIN POINTER --- 
> > DMA_DSP2IODAT_TCB.DP       = (((long)(&DMA_DSP2SONET_SourceTCB) >> 2)
> > & 0x7fff)
> >
> > DMA_DSP2SONET_SourceTCB.DP = (((long)(&DMA_SONET2DSP_SourceTCB) >> 2)
> > & 0x7fff)
> > DMA_DSP2SONET_DestinTCB.DP = (((long)(&DMA_SONET2DSP_DestinTCB) >> 2)
> > & 0x7fff)
> >
> > The DMA_DSP2IODAT_TCB should be chained to DMA_DSP2SONET_SourceTCB and
> > DMA_DSP2SONET_DestinTCB, or after my DMA from the link
> > port(DMA_DSP2IODAT_TCB)
> > I want to do a DMA from DSP memory to external memory. Any ideas how
> > this can be done?
> >
> > joe

Hello, and thanks for responding to my post. You are correct, it is
much easier setting up a DMA on the older SHARCs, but the newer SHARCs
have more flexibility. On the TS101 you define 2-TCB (Source,
Destination) if you are doing Internal <-> External DMAs, but if you
are doing a Internal <-> Link you only need 1-TCB. In each TCB you can
have it chain to another TCB. I'm still trying to figure out how to
set up the chain of Link Port DMA and then a DMA from internal to
external memory.

joe

"joe" <jjlindula@hotmail.com> wrote in message
news:880397ee.0410200546.5e1cea9f@posting.google.com...
> "Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message
news:<2tlp66F21if97U1@uni-berlin.de>...
> > "joe" <jjlindula@hotmail.com> wrote in message
> > news:880397ee.0410191549.3bbf5e1b@posting.google.com...
> > > Hello, I have a quick question concerning setting up DMA for chaining.
> > > When
> > > doing a DMA from internal memory to external memory you need to setup
> > > 2-TCBs,
> > > one Source and one for Destination. In both TCBs you can give it the
> > > next TCB to execute. Now when you do a link port DMA only 1-TCB needs
> > > to be setup. How can I set that TCB up so when the DMA is finished it
> > > can call another DMA to transfer DSP memory to external memory? The
> > > link port TCB can only define one chain pointer, I need to have the
> > > link port TCB to start the SourceTCB and DestinTCB of the next DMA I
> > > want to do.
> >
> > From what I understand of the SHARCs (I don't know details of the
> > TigerSHARCs specifically), you don't need 2 TCBs to specify a source and
> > destination. You should be able to specify that in 1 TCB - in the 21160
for
> > example, in a DMA between internal and external memory, you can specify
the
> > internal addresses in the IIx, IMx, ICx registers and the external
addresses
> > in the EIx, EMx, ECx registers. All of these are loaded from a single
TCB.
> >
> > Cheers
> > Bhaskar
> >
> > >
> > > Here's my code:
> > >
> > > // SETTING TCB DP REG::       -----  CHAIN POINTER --- 
> > > DMA_DSP2IODAT_TCB.DP       = (((long)(&DMA_DSP2SONET_SourceTCB) >> 2)
> > > & 0x7fff)
> > >
> > > DMA_DSP2SONET_SourceTCB.DP = (((long)(&DMA_SONET2DSP_SourceTCB) >> 2)
> > > & 0x7fff)
> > > DMA_DSP2SONET_DestinTCB.DP = (((long)(&DMA_SONET2DSP_DestinTCB) >> 2)
> > > & 0x7fff)
> > >
> > > The DMA_DSP2IODAT_TCB should be chained to DMA_DSP2SONET_SourceTCB and
> > > DMA_DSP2SONET_DestinTCB, or after my DMA from the link
> > > port(DMA_DSP2IODAT_TCB)
> > > I want to do a DMA from DSP memory to external memory. Any ideas how
> > > this can be done?
> > >
> > > joe
>
> Hello, and thanks for responding to my post. You are correct, it is
> much easier setting up a DMA on the older SHARCs, but the newer SHARCs
> have more flexibility. On the TS101 you define 2-TCB (Source,
> Destination) if you are doing Internal <-> External DMAs, but if you
> are doing a Internal <-> Link you only need 1-TCB. In each TCB you can
> have it chain to another TCB. I'm still trying to figure out how to
> set up the chain of Link Port DMA and then a DMA from internal to
> external memory.

If you have 2 TCBs for a single DMA the manual has got to explain how one
would set off this DMA. Knowing what I know about TCBs, it doesn't make much
sense to have 2 TCBs - one each for source and destination. The only guess I
can make is that you make the source point to the destination TCB and kick
off the source?? So what is the flexibility of having 2 TCBs for an internal
to external transfer? You can do this using 1 TCB in the old SHARCs.

>
> joe

"Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message
news:2tngrmF2205u0U1@uni-berlin.de...
> "joe" <jjlindula@hotmail.com> wrote in message
> news:880397ee.0410200546.5e1cea9f@posting.google.com...
> > "Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message
> news:<2tlp66F21if97U1@uni-berlin.de>...
> > > "joe" <jjlindula@hotmail.com> wrote in message
> > > news:880397ee.0410191549.3bbf5e1b@posting.google.com...
> > > > Hello, I have a quick question concerning setting up DMA for
chaining.
> > > > When
> > > > doing a DMA from internal memory to external memory you need to
setup
> > > > 2-TCBs,
> > > > one Source and one for Destination. In both TCBs you can give it the
> > > > next TCB to execute. Now when you do a link port DMA only 1-TCB
needs
> > > > to be setup. How can I set that TCB up so when the DMA is finished
it
> > > > can call another DMA to transfer DSP memory to external memory? The
> > > > link port TCB can only define one chain pointer, I need to have the
> > > > link port TCB to start the SourceTCB and DestinTCB of the next DMA I
> > > > want to do.
> > >
> > > From what I understand of the SHARCs (I don't know details of the
> > > TigerSHARCs specifically), you don't need 2 TCBs to specify a source
and
> > > destination. You should be able to specify that in 1 TCB - in the
21160
> for
> > > example, in a DMA between internal and external memory, you can
specify
> the
> > > internal addresses in the IIx, IMx, ICx registers and the external
> addresses
> > > in the EIx, EMx, ECx registers. All of these are loaded from a single
> TCB.
> > >
> > > Cheers
> > > Bhaskar
> > >
> > > >
> > > > Here's my code:
> > > >
> > > > // SETTING TCB DP REG::       -----  CHAIN POINTER --- 
> > > > DMA_DSP2IODAT_TCB.DP       = (((long)(&DMA_DSP2SONET_SourceTCB) >>
2)
> > > > & 0x7fff)
> > > >
> > > > DMA_DSP2SONET_SourceTCB.DP = (((long)(&DMA_SONET2DSP_SourceTCB) >>
2)
> > > > & 0x7fff)
> > > > DMA_DSP2SONET_DestinTCB.DP = (((long)(&DMA_SONET2DSP_DestinTCB) >>
2)
> > > > & 0x7fff)
> > > >
> > > > The DMA_DSP2IODAT_TCB should be chained to DMA_DSP2SONET_SourceTCB
and
> > > > DMA_DSP2SONET_DestinTCB, or after my DMA from the link
> > > > port(DMA_DSP2IODAT_TCB)
> > > > I want to do a DMA from DSP memory to external memory. Any ideas how
> > > > this can be done?
> > > >
> > > > joe
> >
> > Hello, and thanks for responding to my post. You are correct, it is
> > much easier setting up a DMA on the older SHARCs, but the newer SHARCs
> > have more flexibility. On the TS101 you define 2-TCB (Source,
> > Destination) if you are doing Internal <-> External DMAs, but if you
> > are doing a Internal <-> Link you only need 1-TCB. In each TCB you can
> > have it chain to another TCB. I'm still trying to figure out how to
> > set up the chain of Link Port DMA and then a DMA from internal to
> > external memory.
>
> If you have 2 TCBs for a single DMA the manual has got to explain how one
> would set off this DMA. Knowing what I know about TCBs, it doesn't make
much
> sense to have 2 TCBs - one each for source and destination. The only guess
I
> can make is that you make the source point to the destination TCB and kick
> off the source?? So what is the flexibility of having 2 TCBs for an
internal
> to external transfer? You can do this using 1 TCB in the old SHARCs.

I was too curious and decided to browse the TS101 manual and I guess I can
kinda see your dilemma of having 2 TCBs on your hands. I'll post more if I
find anything that will be of help to you.

Cheers
Bhaskar

>
> >
> > joe
>
>

"Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message
news:2tnlp9F21vpvuU1@uni-berlin.de...
> "Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message
> news:2tngrmF2205u0U1@uni-berlin.de...
> > "joe" <jjlindula@hotmail.com> wrote in message
> > news:880397ee.0410200546.5e1cea9f@posting.google.com...
> > > "Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message
> > news:<2tlp66F21if97U1@uni-berlin.de>...
> > > > "joe" <jjlindula@hotmail.com> wrote in message
> > > > news:880397ee.0410191549.3bbf5e1b@posting.google.com...
> > > > > Hello, I have a quick question concerning setting up DMA for
> chaining.
> > > > > When
> > > > > doing a DMA from internal memory to external memory you need to
> setup
> > > > > 2-TCBs,
> > > > > one Source and one for Destination. In both TCBs you can give it
the
> > > > > next TCB to execute. Now when you do a link port DMA only 1-TCB
> needs
> > > > > to be setup. How can I set that TCB up so when the DMA is finished
> it
> > > > > can call another DMA to transfer DSP memory to external memory?
The
> > > > > link port TCB can only define one chain pointer, I need to have
the
> > > > > link port TCB to start the SourceTCB and DestinTCB of the next DMA
I
> > > > > want to do.
> > > >
> > > > From what I understand of the SHARCs (I don't know details of the
> > > > TigerSHARCs specifically), you don't need 2 TCBs to specify a source
> and
> > > > destination. You should be able to specify that in 1 TCB - in the
> 21160
> > for
> > > > example, in a DMA between internal and external memory, you can
> specify
> > the
> > > > internal addresses in the IIx, IMx, ICx registers and the external
> > addresses
> > > > in the EIx, EMx, ECx registers. All of these are loaded from a
single
> > TCB.
> > > >
> > > > Cheers
> > > > Bhaskar
> > > >
> > > > >
> > > > > Here's my code:
> > > > >
> > > > > // SETTING TCB DP REG::       -----  CHAIN POINTER --- 
> > > > > DMA_DSP2IODAT_TCB.DP       = (((long)(&DMA_DSP2SONET_SourceTCB) >>
> 2)
> > > > > & 0x7fff)
> > > > >
> > > > > DMA_DSP2SONET_SourceTCB.DP = (((long)(&DMA_SONET2DSP_SourceTCB) >>
> 2)
> > > > > & 0x7fff)
> > > > > DMA_DSP2SONET_DestinTCB.DP = (((long)(&DMA_SONET2DSP_DestinTCB) >>
> 2)
> > > > > & 0x7fff)
> > > > >
> > > > > The DMA_DSP2IODAT_TCB should be chained to DMA_DSP2SONET_SourceTCB
> and
> > > > > DMA_DSP2SONET_DestinTCB, or after my DMA from the link
> > > > > port(DMA_DSP2IODAT_TCB)
> > > > > I want to do a DMA from DSP memory to external memory. Any ideas
how
> > > > > this can be done?
> > > > >
> > > > > joe
> > >
> > > Hello, and thanks for responding to my post. You are correct, it is
> > > much easier setting up a DMA on the older SHARCs, but the newer SHARCs
> > > have more flexibility. On the TS101 you define 2-TCB (Source,
> > > Destination) if you are doing Internal <-> External DMAs, but if you
> > > are doing a Internal <-> Link you only need 1-TCB. In each TCB you can
> > > have it chain to another TCB. I'm still trying to figure out how to
> > > set up the chain of Link Port DMA and then a DMA from internal to
> > > external memory.
> >
> > If you have 2 TCBs for a single DMA the manual has got to explain how
one
> > would set off this DMA. Knowing what I know about TCBs, it doesn't make
> much
> > sense to have 2 TCBs - one each for source and destination. The only
guess
> I
> > can make is that you make the source point to the destination TCB and
kick
> > off the source?? So what is the flexibility of having 2 TCBs for an
> internal
> > to external transfer? You can do this using 1 TCB in the old SHARCs.
>
> I was too curious and decided to browse the TS101 manual and I guess I can
> kinda see your dilemma of having 2 TCBs on your hands. I'll post more if I
> find anything that will be of help to you.
>
> Cheers
> Bhaskar

Sounds like you are out of luck. What you want to do cannot be done using
the TS101 - you can only chain DMAs that involve internal-external transfers
and in that case, you'll point the source TCBs to each other and the
destination TCBs to each other (which makes sense to me). According to page
7-41 of the hardware reference,
"
ADSP-TS101 TigerSHARC Processor 7-41
Hardware Reference

Direct Memory Access

There are some restrictions on chaining DMA across DMA channels. For

internal/external memory DMA transfers, cross channel DMA is not permitted.

DMA processes between internal/external memory can only be

chained within the same channel. Link port DMA processes, however,

may be chained across channels."

Cheers

Bhaskar


>
> >
> > >
> > > joe
> >
> >
>
>

"James Stevenson" <james@stev.org> wrote in message
news:Pine.LNX.4.44.0410201413530.1639-100000@beast.stev.org...
>
> Hi,
>
> you might want to read the silicon errata sheet before messing with DMA on
> the TS101 there are several silicon bugs surronding it.
>
> From what i can remember.
>
> 1. Dont DMA more that 1 channel to sdram or the DMA engine will hang

I don't recall this one, but the advice to read the silicon errata is always
a good one.  There are some issues to take care of, as there are with pretty
much any chip.  At least Analog Devices publish these on their web page -
ever try getting one from Intel?  I'm not sure if I'm even allowed to tell
you I have one, or that it was a paper copy only and hand delivered with
warnings all over it not to make any copies :-)

There may be performance issues for not wanting more than 1 sdram DMA active
at a time, which has to do with sdram page accesses, i.e all sdram takes a
hit when you change pages, so having multiple things doing accesses will
often cause lots of page hits and hence performance loss.



> 2. DMA Chaining is broken for link ports.

This was only on some early silicon revisions, and not using chained DMAs
was a work around to a problem of enabling a link receive DMA before the
first word of data was received.  This was corrected quite a while ago - I
believe we (BittWare) only shipped a handful of TS101 boards with the
silicon verison with this bug.


------
Ron Huizen
BittWare

"Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message
news:2tnm9fF22dmgeU1@uni-berlin.de...
> Sounds like you are out of luck. What you want to do cannot be done using
> the TS101 - you can only chain DMAs that involve internal-external
transfers
> and in that case, you'll point the source TCBs to each other and the
> destination TCBs to each other (which makes sense to me). According to
page
> 7-41 of the hardware reference,
> "
> ADSP-TS101 TigerSHARC Processor 7-41
> Hardware Reference
>
> Direct Memory Access
>
> There are some restrictions on chaining DMA across DMA channels. For
> internal/external memory DMA transfers, cross channel DMA is not
permitted.
> DMA processes between internal/external memory can only be
> chained within the same channel. Link port DMA processes, however,
> may be chained across channels."

Bhaskar,
I don't read what you did from these words from the manual.  Specifically,
it says you can't do cross channel DMA for internal/external but you can for
links, which is opposite of what you said above, isn't it?  You can
certainly do chained DMAs for anything where the chain uses the same DMA
channel, it's a question of what's allowed for having the next TCB in the
chain use a different DMA channel.

In any case, I don't think Joe can do what he wants, which I believe is to
chain a memory DMA to a link DMA.  I wasn't even aware you could ever chain
across channels until this post.  I guess I can see some use for this
capability.

Joe,
If I wasn't so busy with TS201 developments, I'd love to take some time to
dig into this farther.  Of course, you can always ask ADI for help.  If you
don't get any reasonable response, let me know and I can ask some
appropriate people for you.  Based on what I've seen, I don't think you can
use a chain for this, so guess you'll have to use the dma complete interrupt
to kick off the memory transfer dma.

------------
Ron Huizen
BittWare

"Ron Huizen" <rhuizen@bittware.com> wrote in message
news:10nfdqagr2m9b61@corp.supernews.com...
> "Bhaskar Thiagarajan" <bhaskart@my-deja.com> wrote in message
> news:2tnm9fF22dmgeU1@uni-berlin.de...
> > Sounds like you are out of luck. What you want to do cannot be done
using
> > the TS101 - you can only chain DMAs that involve internal-external
> transfers
> > and in that case, you'll point the source TCBs to each other and the
> > destination TCBs to each other (which makes sense to me). According to
> page
> > 7-41 of the hardware reference,
> > "
> > ADSP-TS101 TigerSHARC Processor 7-41
> > Hardware Reference
> >
> > Direct Memory Access
> >
> > There are some restrictions on chaining DMA across DMA channels. For
> > internal/external memory DMA transfers, cross channel DMA is not
> permitted.
> > DMA processes between internal/external memory can only be
> > chained within the same channel. Link port DMA processes, however,
> > may be chained across channels."
>
> Bhaskar,
> I don't read what you did from these words from the manual.  Specifically,
> it says you can't do cross channel DMA for internal/external but you can
for
> links, which is opposite of what you said above, isn't it?  You can
> certainly do chained DMAs for anything where the chain uses the same DMA
> channel, it's a question of what's allowed for having the next TCB in the
> chain use a different DMA channel.

My interpretation was that there are several DMA channels that one could use
for a given transfer task (internal/external, link, sport, etc) and in the
case of the links, you could chain link port transfers that used different
channels. I also read the part where internal/external transfers couldn't do
cross channel DMAs and in the OP's case there were definitely 2 channels
involved - so I concluded it wasn't possible.

Cheers
Bhaskar

>
> In any case, I don't think Joe can do what he wants, which I believe is to
> chain a memory DMA to a link DMA.  I wasn't even aware you could ever
chain
> across channels until this post.  I guess I can see some use for this
> capability.
>
> Joe,
> If I wasn't so busy with TS201 developments, I'd love to take some time to
> dig into this farther.  Of course, you can always ask ADI for help.  If
you
> don't get any reasonable response, let me know and I can ask some
> appropriate people for you.  Based on what I've seen, I don't think you
can
> use a chain for this, so guess you'll have to use the dma complete
interrupt
> to kick off the memory transfer dma.
>
> ------------
> Ron Huizen
> BittWare
>
>