ep1s25 Altera Corporation, ep1s25 Datasheet - Page 36

• Manufacturer Part Number: ep1s25
• Description: Stratix Device Family Data Sheet
• Manufacturer: Altera Corporation

TriMatrix Memory
2–22
Stratix Device Handbook, Volume 1
1
Memory Modes
TriMatrix memory blocks include input registers that synchronize writes
and output registers to pipeline designs and improve system
performance. M4K and M-RAM memory blocks offer a true dual-port
mode to support any combination of two-port operations: two reads, two
writes, or one read and one write at two different clock frequencies.
Figure 2–12
Figure 2–12. True Dual-Port Memory Configuration
Notes to
(1)
(2)
Configurations
Table 2–3. TriMatrix Memory Features (Part 2 of 2)
Memory Feature
See
The M-RAM block does not support memory initializations. However, the
M-RAM block can emulate a ROM function using a dual-port RAM bock. The
Stratix device must write to the dual-port memory once and then disable the
write-enable ports afterwards.
Table 4–36
Table
Violating the setup or hold time on the address registers could
corrupt the memory contents. This applies to both read and
write operations.
shows true dual-port memory.
2–3:
for maximum performance information.
data
address
wren
clocken
q
aclr
A
clock
[ ]
512 × 1
256 × 2
128 × 4
64 × 8
64 × 9
32 × 16
32 × 18
A
M512 RAM Block
A
A
[ ]
(32 × 18 Bits)
A
A
A
[ ]
A
4K × 1
2K × 2
1K × 4
512 × 8
512 × 9
256 × 16
256 × 18
128 × 32
128 × 36
M4K RAM Block
(128 × 36 Bits)
B
address
clocken
clock
data
wren
aclr
q
B
B
B
B
[ ]
[ ]
[ ]
B
B
B
Altera Corporation
64K × 8
64K × 9
32K × 16
32K × 18
16K × 32
16K × 36
8K × 64
8K × 72
4K × 128
4K × 144
(4K × 144 Bits)
M-RAM Block
July 2005