B: Arbitration granularity
IDLE cycle
mechanism:
more than 2
idle cycles?
Exclusive read?
End of
BURSTCOMPLETE
transaction?*
End of
EXTENDEDGRANT
transaction?
Use
Rotation
Engine?
End of
NOFSERVICES
transaction?
B
No
Yes
A
Yes
Yes
No
No
No
Yes
No
Yes
No
A: Arbitration decision
Allows the arbiter to wait for 1 idle cycle before
moving the arbitration grant to another thread.
Atomic request: is a command inserted after
RdEx and before its associated unlocking WNP?
Per group, define the number of consecutive
transactions this group can be granted.
The priority can be given to a group within a class
until the complete burst that is to proceed has
been stored into the FIFO.
A burst transaction should always be completed.
sdrc-032
* Only if BURSTCOMPLETE is active for the request
which has access
Public Version
SDRAM Controller (SDRC) Subsystem
www.ti.com
Figure 10-75. Arbitration Granularity
2294
Memory Subsystem
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated