EP2AGX95EF29C6N Datasheet, PDF (66/380 Pages) Altera Corporation – Device Interfaces and Integration

3–18
Chapter 3: Memory Blocks in Arria II Devices
Memory Modes
Figure 3–18 shows the memory block in shift-register mode.
Figure 3–18. Shift-Register Memory Configuration
w × m × n Shift Register
m-Bit Shift Register
W
W
m-Bit Shift Register
W
W
n Number of Taps
m-Bit Shift Register
W
W
m-Bit Shift Register
W
W
ROM Mode
All Arria II memory blocks support ROM mode. A .mif initializes the ROM contents
of these blocks. The address lines of the ROM are registered on M9K and M144K
blocks; however, they can be unregistered on MLABs. The outputs can be registered
or unregistered. Output registers can be asynchronously cleared. The ROM read
operation is identical to the read operation in the single-port RAM configuration.
FIFO Mode
All memory blocks support FIFO mode. MLABs are ideal for designs with many
small, shallow FIFO buffers. To implement FIFO buffers in your design, you can use
the FIFO MegaWizard Plug-In Manager in the Quartus II software. Both single- and
dual-clock (asynchronous) FIFOs are supported.
f For more information about implementing FIFO buffers, refer to the SCFIFO and
DCFIFO Megafunctions User Guide.
1 MLABs do not support mixed-width FIFO mode.
Arria II Device Handbook Volume 1: Device Interfaces and Integration
December 2011 Altera Corporation