AMBA AHB HSPLITx signal.....

Offline LEO LEO over 6 years ago

Note: This was originally posted on 30th September 2008 at http://forums.arm.com

Hi guys...

I am trouble again.....

My question is :

If slave 0 gives split error to two masters say master 0 and master 1...
Now slave can generate Hsplitx for both masters at same time??
Or slave can generate Hsplitx for only one master at a time....???

Please reply ASAP......
Thanks in advance....

0 Offline Colin Campbell over 6 years ago

Note: This was originally posted on 13th November 2008 at http://forums.arm.com

By asserting HSPLIT bits, the slave is not talking to two masters at the same time, in fact it is not talking to any master.

HSPLIT tells the arbiter that one (or more) masters can now be re-enabled in the arbitration scheme again.

The arbiter decides which master should be next granted, and when appropriate, the previously SPLIT master(s) will become granted.

Obviously only one master will be granted at a time.

HSPLIT tells the arbiter when masters can be re-enabled in the arbitration scheme, not that they must be immediately granted. I think this is what is confusing you.

JD
Cancel
Up 0 Down

Reply

Accept answer

Cancel
0 Offline Colin Campbell over 6 years ago

Note: This was originally posted on 1st October 2008 at http://forums.arm.com

Single slave can assert hsplitx signal for two master at a single time.
Is it so??

Yes, this is possible.

JD
Cancel
Up 0 Down

Reply

Accept answer

Cancel
0 Offline Colin Campbell over 6 years ago

Note: This was originally posted on 30th September 2008 at http://forums.arm.com

Hi Leo,

The spec doesn't stop the slave asserting two HSPLIT bits at a time if appropriate, so this should be okay.

The arbiter would not have a problem with two HSPLIT bits high at one time because it could be two different slaves independently driving one bit each.

Is this an "in theory" question, or are you actually contemplating designing a SPLIT capable slave that might assert two (or more) HSPLIT bits in the same cycle ?

JD
Cancel
Up 0 Down

Reply

Accept answer

Cancel
0 Offline mkrishna mkrishna over 6 years ago

Note: This was originally posted on 12th November 2008 at http://forums.arm.com

Yes, this is possible.

JD

Hi JD,

When arbiter selects a Master, it can talk with only one Slave at a time. So a Slave can talk to only one Master at a time. If this is the case, how is it possible for a Slave to assert two of its HSPLIT bits simultaneously? I hope I am not confused.

Regards,
mkrishna
Cancel
Up 0 Down

Reply

Accept answer

Cancel
0 Offline mkrishna mkrishna over 6 years ago

Note: This was originally posted on 16th November 2008 at http://forums.arm.com

Hi JD,

Yes, I got confused. Thanks for the immediate reply.

-mkrishna
Cancel
Up 0 Down

Reply

Accept answer

Cancel
0 Offline LEO LEO over 6 years ago

Note: This was originally posted on 30th September 2008 at http://forums.arm.com

Thanks JD for your answer....

Actually I am verification engineer....
I am working on a verification environment...
I am facing such condition in my slave component...
so i want to clarify the things before making changes...

Please correct me if I am wrong...
As per your answer ...
Single slave can assert hsplitx signal for two master at a single time.
Is it so??
Cancel
Up 0 Down

Reply

Accept answer

Cancel

AMBA AHB HSPLITx signal.....

AXI4 transaction attributes 0

AMBA 5 CHI Link Layer (L-Credit Return) 0

Is AXI4 Ordered write observation used to support PCIE Producer/Consumer ordering model? 0

BUSY transfer just before the last transfer in a burst by a AHB Master. 0

AMBA AXI reset 0