Altera cyclone V Technical Reference page 760

cv_5v4
11-22
Memory Protection
2016.10.28
Figure 11-7: SDRAM Protection Access Flow Diagram
Start
Evaluate all rules
for match
Ignore all rules that
do not match
Port default
Allowed Not Allowed
access
Ignore all "allow" Ignore all "fail" rules
rules that match that match
Any "fail" rule Any "allow" rule
yes no yes no
that matches? that matches?
Reject Access Allow Access Allow Access Reject Access
End
Exclusive transactions are security checked on the read operation only. A write operation can occur only if
a valid read is marked in the internal exclusive table. Consequently, a master performing an exclusive read
followed by a write, can write to memory only if the exclusive read was successful.
Related Information
ARM TrustZone
For more information about TrustZone refer to the ARM web page.
SDRAM Controller Subsystem
Altera Corporation
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