Hello Leon,
according to our measurements the data throughput would be
about 30MB/sec.
Regards
Holger Krause.
------------------------------------------------------------
----
SIEB & MEYER AG
Software-Entwicklung CNC / Holger Krause
Auf dem Schmaarkamp 21
D-21339 Lüneburg
Germany
Tel.: +49-(0)4131 203-1505
Fax.: +49-(0)4131 38562
E-Mail: Holger.Krause sieb-meyer.de
http://www.sieb-meyer.de
Leon Woestenberg
<leonwmailcan.co
m>
An
ColdFire Mailing
List
11.07.2006 10:43 <ColdFirelists.wildrice.com>
Kopie
holger.krausesieb-meyer.de,
john.bodnarfreescale.com
Thema
Re: [ColdFire] Speed
of FlexBus on
the MCF547x
Hello John, Holger,
we are hooking up a FPGA to the Flexbus (for 2D graphics to
HDTV) on one
of our experimental boards, which has not
been brought up yet.
What is a good ballpark figure of the the data throughput I
can expect?
Regards,
Leon.
holger.krausesieb-meyer.de wrote:
> Hello John,
>
> first of all thanks for the quick answer.
>
> Our intention is to upgrade our current processor
(MCF5407) to a more
> powerful one with at least 30% more performance so the
MCF5474 seemed to
be
> a good candidate.
> If there is going to be a new high-end ColdFire device
I am very
> interested!
>
> Best regards
> Holger Krause.
>
>
------------------------------------------------------------
----
> SIEB & MEYER AG
> Software-Entwicklung CNC / Holger Krause
> Auf dem Schmaarkamp 21
> D-21339 Lüneburg
> Germany
> Tel.: +49-(0)4131 203-1505
> Fax.: +49-(0)4131 38562
> E-Mail: Holger.Krausesieb-meyer.de
> http://www.sieb-meyer.de
>
>
>
>
> John Bodnar
> <john.bodnarfree
> scale.com>
An
>
holger.krausesieb-meyer.de
> 10.07.2006 22:14
Kopie
>
>
Thema
> Re: [ColdFire]
Speed of FlexBus
on
> the MCF547x
>
>
>
>
>
>
>
>
>
>
>
> Hello Holger,
>
> I think what you're seeing is an artifact of the
MCF547x/8x design.
>
> We built this device on a PowerPC platform, so the
internal bus is
> 64-bit XLB. The V4e ColdFire core, however, only has a
32-bit bus
> interface and cannot issue burst transactions across
the FlexBus, If I
> remember correctly.
>
> Our new devices, the MCF5207/8, MCF532x, and MCF537x
are built on a
> different platform with native ColdFire buses
throughout and support
> core bursts to the FlexBus.
>
> We're working on a new high-end ColdFire device that
also uses the
> FlexBus (it is now our standard external bus interface
module), and you
> may want to check it out when it is introduced in a few
months time.
>
> Best regards,
>
> John Bodnar
> Systems Engineer
> Microcontroller Division
>
> --
>
> holger.krausesieb-meyer.de wrote:
>
>> Hello,
>>
>> we want to connect SRAM to the FlexBus of our
MCF5474 board. So we
>> configured the appropriate chip selects and wrote a
simple routine which
>> accesses this memory. Everything works fines but
the performance seems
to
>> be too low: One access is very fast (~25ns) but the
time between two
>> accesses is about 130ns! => this is slower than
the MCF5407.
>> The FBCSn-signal is active for about <20ns -
this is very fast - but
the
>> time between the raising edge of FBCSn and the
falling edge of the next
>> FBCS is very long (about > 100ns).The R/W signal
is valid for the whole
>> time so there are no other accesses. We don't
know what the processor
is
>> doing in the meantime. Or is it already full speed?
>>
>> We also changed the configuration of the arbiter
but unfortunantely it
>> seems to have no effect.
>>
>> The CLKIN is 66.66MHz, the CS has no waitstates,
IRQs are off and the
>>
> code
>
>> runs in the core SRAM.
>>
>> Has anyone similar experiences or advices for
improving the speed?
>>
>> Best regards,
>>
>> Holger Krause.
>>
>>
------------------------------------------------------------
----
>> SIEB & MEYER AG
>> Software-Entwicklung CNC / Holger Krause
>> Auf dem Schmaarkamp 21
>> D-21339 Lüneburg
>> Germany
>> Tel.: +49-(0)4131 203-1505
>> Fax.: +49-(0)4131 38562
>> E-Mail: Holger.Krausesieb-meyer.de
>> http://www.sieb-meyer.de
>>
>>
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>>
>>
>
> --
>
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> [ ]General Business Information
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>
>
>
>
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