Altera Stratix - Page 407

Altera Corporation 10–15
July 2005 Stratix Device Handbook, Volume 2
Transitioning APEX Designs to Stratix & Stratix GX Devices
■ There are differences in power-up behavior between APEX II,
APEX 20K, and Stratix and Stratix GX devices. You should manually
account for these differences to maintain desired operation of the
system.
Table 10–5. Migration Mode Summary
Memory
Configuration
Conditions
Possible
Instantiated
Megafunctions
Quartus II Warning
Message(s)
Programming
File
Generated
Single-port All inputs are registered.
altram
altrom
lpm_ram_dq
lpm_ram_io
lpm_rom
Power-up differences. (1)
Ye s
Multi-port (two-,
three-, or four-port
functions)
All inputs are registered.
altdpram
lpm_ram_dp
altqpram
alt3pram
Power-up differences.
Mixed-port read- during-
write. (1)
Ye s
Dual-port Read-enable ports are
unregistered.
Other inputs registered.
altdpram
lpm_ram_dp
altqpram
alt3pram
Power-up differences.
Mixed-port read- during-
write.
Read enable will be
registered. (1)
Ye s
Dual-port Any other unregistered
port except read-enable
ports.
Clock available.
altdpram
lpm_ram_dp
altqpram
alt3pram
Compile for fitting- evaluation
purposes.
No
Single-port At least one registered
input.
Clock available.
altram
lpm_ram_dq
lpm_ram_io
Compile for fitting- evaluation
purposes.
No
No clock No clock.
altram
altrom
altdpram
altqpram
alt3pram
altdpram
lpm_ram_dq
lpm_ram_io
lpm_rom
lpm_ram_dp
lpm_ram_dp
Error – no conversion
possible.
No
Note to Table 10–5:
(1) If the SUPPRESS_MEMORY_COUNVERSION_WARNINGS parameter is turned on, the Quartus II software does not
issue these warnings.