Sdram Power Management - Altera Cyclone V Device Handbook

cv_54008
2013.12.30
The port mask value, TID Low, and TID High, apply to all ports and all transfers within those ports. Each
access request is evaluated against the memory protection table, and will fail unless a rule matches allowing
a transaction to complete successfully.
The following table shows the result for a sample set of transactions.
Table 8-6: Result for a Sample Set of Transactions
Operation
Read CPU
Write CPU
Write L3 attached masters
Read L3 attached masters
Write CPU
Write L3 attached masters
If you did not want any overlap between the memory blocks, you could specify the address ranges in the
two rules of the Memory Protection Table to be mutually exclusive. Depending on your desired TrustZone
configuration, you can add rules to the memory protection table to create multiple blocks of protected or
unprotected space.

SDRAM Power Management

The SDRAM controller subsystem supports the following power saving features in the SDRAM:
• Partial array self-refresh (PASR)
• Power down
• Deep power down for LPDDR2
Power-saving mode initiates either due to a user command or from inactivity.
Power-down mode is initiated by writing to the appropriate control register. It forces the SDRAM burst-
scheduling bank-management logic to close all banks and issue the power down command. You can program
the controller to enable power-down when the SDRAM burst-scheduling queue is empty for a specified
number of clock cycles. The SDRAM automatically reactivates when an active SDRAM command is received.
Other power-down modes are performed only under user control.
SDRAM Controller Subsystem
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Source
4096
536, 870, 912 (512 MB)
605, 028, 350 (577 MB)
4096
536, 870, 912 (512 MB)
605, 028, 350 (577 MB)
Address Prot
1
1
1
0
0
0
SDRAM Power Management
Result Comments
Allow Matches rule 1.
Allow Matches rule 1.
Fail Does not match rule
1 (out of range of the
address field), does
not match rule 2
(protection bit
incorrect).
Fail Does not match rule
1 (prot value wrong),
does not match rule 2
(not in address range)
.
Allow Matches rule 2.
Allow Matches rule 2.
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