Chapter 10 Memory Subsystem.pdf

C1 Win
No
Group 0 empty?
Yes
No
Group 1 empty?
Yes
Request is part of burst and
BURSTCOMPLETE = 1 and
The full burst is not available?
Yes
Request is part of burst and
BURSTCOMPLETE = 1 and
The full burst is not available?
No
Group 1 empty?
Yes
Group 0 Win
No
Yes Group 1 Win
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SDRAM Controller (SDRC) Subsystem www.ti.com
Figure 10-73. Arbitration Within a Class
For class 1 - group 0, read the
SMS_CLASS_ARBITER1[24] BURSTCOMPLETE bit.
No
For class 1 - group 1, read the
SMS_CLASS_ARBITER1[25] BURSTCOMPLETE bit.
Request is part of burst and
BURSTCOMPLETE = 1 and
The full burst is not available?
To know the priority between group 0 and group 1 within class 1:
Read the SMS_CLASS_ARBITER1[0] HIGHPRIOVECTOR bit for group 0.
Read the SMS_CLASS_ARBITER1[1] HIGHPRIOVECTOR bit for group 1.
This attribute can be given to one group at a time.
If the HIGHPRIOVECTOR is set to 1, the group has the highest priority.
Yes
Group 0 Win
Group 0 higher priority Read the
HIGHPRIOVECTOR field
Group 1 higher priority
Group 0 Win Group 1 Win
For class 1 - group 1, read the
SMS_CLASS_ARBITER1[25] BURSTCOMPLETE bit.
Yes
No
HIGHPRIOVECTOR ?
No
LRU policy between
group 0 and group 1
2274 Memory Subsystem SPRUGN4L–May 2010–Revised June 2011
Copyright © 2010–2011, Texas Instruments Incorporated
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