Altera Stratix - Memory Megafunctions

10–12 Altera Corporation
Stratix Device Handbook, Volume 2 July 2005
TriMatrix Memory
always output a don’t care value. Figures 10–7 and 10–8 show the feed-
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 10–7. Mixed-Port Feed-Through Behavior (OLD_DATA) Note (1)
Note to Figure 10–7:
(1) Figures 10–7 and 10–8 assume that the address stays constant throughout and that
the outputs are not registered.
Figure 10–8. Mixed-Port Feed-Through Behavior (DONT_CARE) Note (1)
Note to Figure 10–8:
(1) Figures 10–7 and 10–8 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
AOld
Port B
wren
B
Address Q
address
A
and
address
B
inclock
Port A
data_in
Port A
wren
Port B
data_out
AB
BUnknown
Port B
wren
Address Q
address
A
and
address
B