Chapter 10 Memory Subsystem.pdf

B: Arbitration granularity
Yes
No
No
IDLE cycle
mechanism:
more than 2
idle cycles?
Exclusive read?
End of
BURSTCOMPLETE
transaction?*
Use
Rotation
Engine?
No
No
No
Yes
End of
EXTENDEDGRANT
transaction?
Public Version
SDRAM Controller (SDRC) Subsystem www.ti.com
Figure 10-75. Arbitration Granularity
Yes
Yes
A
Yes
End of
NOFSERVICES
transaction?
Allows the arbiter to wait for 1 idle cycle before
moving the arbitration grant to another thread.
A: Arbitration decision
Atomic request: is a command inserted after
RdEx and before its associated unlocking WNP?
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.
* Only if BURSTCOMPLETE is active for the request
which has access
Per group, define the number of consecutive
transactions this group can be granted.
2276 Memory Subsystem SPRUGN4L–May 2010–Revised June 2011
No
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B
sdrc-032