3–12
Altera Corporation
Stratix GX Device Handbook, Volume 3
July 2005
TriMatrix Memory
through behavior of the mixed-port mode. You can use the altsyncram
megafunction to set the output behavior during mixed-port read-during-
write mode.
Figure 3–7. Mixed-Port Feed-Through Behavior (OLD_DATA) Note (1) (1)
Figures 3–7 and
3–8 assume that the address stays constant throughout and that
the outputs are not registered.
Figure 3–8. Mixed-Port Feed-Through Behavior (DONT_CARE) Note (1) (1)
Figures 3–7 and
3–8 assume that the address stays constant throughout and that
the outputs are not registered.
Memory Megafunctions
To convert RAM and ROM originally targeting the APEX II or APEX 20K
architecture to Stratix or Stratix GX memory, specify Stratix or Stratix GX
as the target family in the MegaWizard Plug-In Manager. The software
inclock
Port A
data_in
Port A
wren
Port B
data_out
AB
A
Old
Port B
wren
B
Address Q
addressA and
addressB
inclock
Port A
data_in
Port A
wren
Port B
data_out
AB
B
Unknown
Port B
wren
Address Q
addressA and
addressB