Forums

Speed and the need for

Started by Adam W January 18, 2001
Hi,

we're considering a C6711 DSK. The Ti Site
(http://focus.ti.com/docs/tool/toolfolder.jhtml?
PartNumber=TMDS320006711) states,

"Operating at 150 MHz, the 'C6711 delivers an impressive 1200 MIPS
and 600 MFLOPs for only U.S. $22* (1K units). "

So Im lookin in the PDF file for the processor (sprs073d) and I see -

"
Fixed-Point: TMS320C6211
150-, 167-MHz Clock Rates
6.7-, 6-ns Instruction Cycle Time
1200, 1333 MIPS

Floating-Point: TMS320C6711
100-, 150-MHz Clock Rates
10-, 6.7-ns Instruction Cycle Time
600, 900 MFLOPS
512K-Bit (64K-Byte) L2 Unified Mapped
"

Can someone explain whether this thing does 600/900 Mflops or
1200/1333 Mips, or both, which would be okay by me.

thanks,
Adam



Adam

The 6211 is fixed point and delivers the MIPS numbers, the 6711 is floating
point and delivers the MFLOPS quoted. Both are available for 150MHz or
167MHz clocks hence the two pairs of numbers.
The 100MHz/600MFLOPS is for the 6712 which is a cheaper/slower version of
the 6711.
The 6211 and 6711 DSK's are set to 150MHz. The 6212 has only just been
announced so don't expect to be able to get a DSK for that for a while at
least.

Regards
David Burkitt
T L Jones - Microscan
P O Box 1151
Christchurch
New Zealand
0064 3 349 1752
FAX 0064 3 349 5466
http://www.tljones-microscan.co.nz

-----Original Message-----
From: Adam W [mailto:]
Sent: Friday, January 19, 2001 7:11 AM
To:
Subject: [c6x] Speed and the need for Hi,

we're considering a C6711 DSK. The Ti Site
(http://focus.ti.com/docs/tool/toolfolder.jhtml?
PartNumber=TMDS320006711) states,

"Operating at 150 MHz, the 'C6711 delivers an impressive 1200 MIPS
and 600 MFLOPs for only U.S. $22* (1K units). "

So Im lookin in the PDF file for the processor (sprs073d) and I see -

"
Fixed-Point: TMS320C6211
150-, 167-MHz Clock Rates
6.7-, 6-ns Instruction Cycle Time
1200, 1333 MIPS

Floating-Point: TMS320C6711
100-, 150-MHz Clock Rates
10-, 6.7-ns Instruction Cycle Time
600, 900 MFLOPS
512K-Bit (64K-Byte) L2 Unified Mapped
"

Can someone explain whether this thing does 600/900 Mflops or
1200/1333 Mips, or both, which would be okay by me.

thanks,
Adam
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Adam,

Comparing the speed of DSP chips by simple numbers is not terribly useful.
The C62/C67 families are especially awkward to compare to other DSPs
because of their VLIW instruction format.

I try to compare these parts by considering how the instructions can be
used for simple DSP algorithms. The most common computation is a
convolution. This is simply MACs (multiply accumulates). The C6 and C62
compute in a similar manner for this function. In a convolution only 4 of
the 8 computation units do useful computations. This would give you 600
MFLOPS compared to 1200 MIPS (TI's rating using all 8 computation units). I
count each MAC as a single instruction as it is in most other DSPs. This
gives you 300 MIPS vs. TIs rating.

TI is really overrating these chips, very knowingly. When you are doing
computations that access memory, the other four computation units are
calculating addresses and accessing memory. These are functions that every
other DSP chip does without counting them as MIPs.

So at 150 MHz, the C67 and C62 chips are roughly equivalent to simpler
chips running with dual accumulators at 150 MIPs. The C5510 will surpass
that when it is out later this year.
At 01:10 PM 1/18/01, you wrote:
>Hi,
>
> we're considering a C6711 DSK. The Ti Site
>(http://focus.ti.com/docs/tool/toolfolder.jhtml?
>PartNumber=TMDS320006711) states,
>
>"Operating at 150 MHz, the 'C6711 delivers an impressive 1200 MIPS
>and 600 MFLOPs for only U.S. $22* (1K units). "
>
>So Im lookin in the PDF file for the processor (sprs073d) and I see -
>
>"
>Fixed-Point: TMS320C6211
> 150-, 167-MHz Clock Rates
> 6.7-, 6-ns Instruction Cycle Time
> 1200, 1333 MIPS
>
>Floating-Point: TMS320C6711
> 100-, 150-MHz Clock Rates
> 10-, 6.7-ns Instruction Cycle Time
> 600, 900 MFLOPS
> 512K-Bit (64K-Byte) L2 Unified Mapped
>"
>
>Can someone explain whether this thing does 600/900 Mflops or
>1200/1333 Mips, or both, which would be okay by me.
>
> thanks,
> Adam
Rick Collins
Arius - A Signal Processing Solutions Company
Specializing in DSP and FPGA design

Arius http://www.arius.com
4 King Ave 301-682-7772 Voice
Frederick, MD 21701-3110 301-682-7666 FAX