[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[openrisc] Running slower wishone interfaces

Hi All,
      I've just managed to get the OpenRISC core running under Modelsim 5.6.
However
It only seems to work with the Risc clock & Wishbone clock running at 1:1
I've tried changing the appropriate defines and the clmode input for 1:2 and
1:4 ratios
but the instruction address doesn't appear increment correctly. Instead of
fetching
from 0x100, 0x104, 0x0108  it follows 0x100, 0x108, 0x110
This looks suspiciously like a clock domain issue and a missing synchroniser
somewhere but
I've checked the code & defines and it seems ok

Has anybody successfully run the core under modelsim with slower
(half/quarter speed)
wishbone interfaces on instruction/data memories ?


Regards,

Mike Scott

___________________________________________________
Jennic Ltd, Furnival Street, Sheffield, S1 4QT,  UK
www.jennic.com  Tel: +44 (0) 114 2812655   Confidential
___________________________________________________




BEGIN:VCARD
VERSION:2.1
N:Scott;Michael;;Mr.
FN:Michael Scott (E-mail)
ORG:Jennic
TITLE:Design Engineer
TEL;WORK;VOICE:+44 (0) 114 281 4530
ADR;WORK:;;;Sheffield;South Yorkshire;S1 4QT;United Kingdom
LABEL;WORK;ENCODING=QUOTED-PRINTABLE:Sheffield, South Yorkshire S1 4QT=0D=0AUnited Kingdom
ADR;HOME;ENCODING=QUOTED-PRINTABLE:;;23 Manor Close=0D=0AKnighton Fields;Worksop;Nottinghamshire;S80 3QT;United=
 Kingdom
LABEL;HOME;ENCODING=QUOTED-PRINTABLE:23 Manor Close=0D=0AKnighton Fields=0D=0AWorksop, Nottinghamshire S80 3QT=
=0D=0AUnited Kingdom
EMAIL;PREF;INTERNET:mike.scott@jennic.com
REV:20020515T071831Z
END:VCARD

BEGIN:VCARD
VERSION:2.1
N:Scott;Michael;;Mr.
FN:Michael Scott (E-mail)
ORG:Jennic
TITLE:Design Engineer
TEL;WORK;VOICE:+44 (0) 114 281 4530
ADR;WORK:;;;Sheffield;South Yorkshire;S1 4QT;United Kingdom
LABEL;WORK;ENCODING=QUOTED-PRINTABLE:Sheffield, South Yorkshire S1 4QT=0D=0AUnited Kingdom
ADR;HOME;ENCODING=QUOTED-PRINTABLE:;;23 Manor Close=0D=0AKnighton Fields;Worksop;Nottinghamshire;S80 3QT;United=
 Kingdom
LABEL;HOME;ENCODING=QUOTED-PRINTABLE:23 Manor Close=0D=0AKnighton Fields=0D=0AWorksop, Nottinghamshire S80 3QT=
=0D=0AUnited Kingdom
EMAIL;PREF;INTERNET:mike.scott@jennic.com
REV:20020515T071831Z
END:VCARD