Reply by Ilya Druker ●June 7, 20042004-06-07
I think you mistakes. By "immediate addressing" TI means many things,
for example
1. ld #num,A - the immediate-addressed number num is included in
the instruction opcode
2. ld *(x),A - the immediate-addressed address x is included in the
instruction opcode.

So, I think that by saying "dmad is using immediate addressing" TI
support means that 7 offset bits are included in the instruction opcode.

As to Chapter 5, "Volume 1: CPU and Peripherals" - the quotes in my
original question are from there.

Now, combining the kind comments of Jeff Brower, answer of TI's
support and my own experiments I would define dmad addressing as follows:
dmad is the direct data-memory addressing mode with 7 offset bits
put into instruction opcode and segment 9 bits assumed zero.

Any objection?
Ilya Druker
--- In , Micah Caudle <micah_caudle@y...> wrote:
> They lied to you. dmad is used in Absolute Addressing
> not in Immediate Addressing. And, furthermore,
> immediate addressing does not have anything to do with
> DP, CPL or SP anyway. The DP, CPL and SP stuff is
> involved in Direct Addressing. Everything you need to
> know is located in Chapter 5, "Volume 1: CPU and
> Peripherals" document spru131G.
> Hope that helps,
> Micah
>
> > Message: 2
> > Date: Thu, 03 Jun 2004 14:06:57 -0000
> > From: "Ilya Druker" <ied1970r@h...>
> > Subject: 'dmad' - fundamental question to
> > specialists
> >
> > Gentlemen,
> >
> > I am desperately looking for answer to the question
> > what is 'dmad'
> > addressing mode? The TI's materials don't give an
> > intelligible
> > definition but only foggiest discriptions like
> > "16-bits immediate data
> > memory address (0<=dmad<e535)" or "uses a specific
> > value to specify
> > and address in data space" or "the syntax for dmad
> > uses a symbol or a
> > number to specify an address in data space" etc. I
> > dared to ask TI's
> > support and their answer was:
> >
> > "dmad is using immediate addressing.
> > In C54x TI terminology, immediate addressing is a
> > "fixed" address
> > composed of 2 "halves".
> > 7-bits contained within the instruction's opcode
> > 9-bits contained in the the DP (Data-memory page
> > Pointer) register"
> >
> > It seems wrong as in the following example all 16
> > bits were put by
> > compiler to the opcode of the instruction (to remind
> > - the syntax is
> > "MVDM dmad,MMR"):
> > MVDM *(33000),AR3
> >
> > Moreover, I don't see any difference in the
> > performance under
> > different environment conditions:
> > 1. MVDM AR2,AR3 ; when CPL=0 and DP=0
> > 2. MVDM AR2,AR3 ; when CPL=0 and DP!=0
> > 3. MVDM AR2,AR3 ; when CPL=1 and DP=0
> > 4. MVDM AR2,AR3 ; when CPL=1 and DP!=0
> > 5. MVDM *(AR2),AR3
> > It seems that DSP just ignores DP when the mode is
> > dmad. If it is so
> > why do we need MVMM for copying content of one
> > register to another if
> > we can use MVDM for that: instead of
> > MVMM AR2,AR3
> > use
> > MVDM AR2,AR3
> > or
> > MVMD AR2,AR3 ?
> >
> > Can somebody make an order in this mess? I would
> > really appreciate a
> > competent answer or a reference.
> >
> > Thank you,
> > Ilya Druker
> >
> >
> >
>
> __________________________________
>




Reply by Micah Caudle ●June 4, 20042004-06-04
They lied to you. dmad is used in Absolute Addressing
not in Immediate Addressing. And, furthermore,
immediate addressing does not have anything to do with
DP, CPL or SP anyway. The DP, CPL and SP stuff is
involved in Direct Addressing. Everything you need to
know is located in Chapter 5, "Volume 1: CPU and
Peripherals" document spru131G.
Hope that helps,
Micah

> Message: 2
> Date: Thu, 03 Jun 2004 14:06:57 -0000
> From: "Ilya Druker" <>
> Subject: 'dmad' - fundamental question to
> specialists
>
> Gentlemen,
>
> I am desperately looking for answer to the question
> what is 'dmad'
> addressing mode? The TI's materials don't give an
> intelligible
> definition but only foggiest discriptions like
> "16-bits immediate data
> memory address (0<=dmad<e535)" or "uses a specific
> value to specify
> and address in data space" or "the syntax for dmad
> uses a symbol or a
> number to specify an address in data space" etc. I
> dared to ask TI's
> support and their answer was:
>
> "dmad is using immediate addressing.
> In C54x TI terminology, immediate addressing is a
> "fixed" address
> composed of 2 "halves".
> 7-bits contained within the instruction's opcode
> 9-bits contained in the the DP (Data-memory page
> Pointer) register"
>
> It seems wrong as in the following example all 16
> bits were put by
> compiler to the opcode of the instruction (to remind
> - the syntax is
> "MVDM dmad,MMR"):
> MVDM *(33000),AR3
>
> Moreover, I don't see any difference in the
> performance under
> different environment conditions:
> 1. MVDM AR2,AR3 ; when CPL=0 and DP=0
> 2. MVDM AR2,AR3 ; when CPL=0 and DP!=0
> 3. MVDM AR2,AR3 ; when CPL=1 and DP=0
> 4. MVDM AR2,AR3 ; when CPL=1 and DP!=0
> 5. MVDM *(AR2),AR3
> It seems that DSP just ignores DP when the mode is
> dmad. If it is so
> why do we need MVMM for copying content of one
> register to another if
> we can use MVDM for that: instead of
> MVMM AR2,AR3
> use
> MVDM AR2,AR3
> or
> MVMD AR2,AR3 ?
>
> Can somebody make an order in this mess? I would
> really appreciate a
> competent answer or a reference.
>
> Thank you,
> Ilya Druker >
__________________________________