EP4SE360F35I4 Datasheet, PDF (66/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

3–10
Chapter 3: TriMatrix Embedded Memory Blocks in Stratix IV Devices
Memory Modes
Single-Port RAM Mode
All TriMatrix memory blocks support single-port mode. Single-port mode allows you
to do either one-read or one-write operation at a time. Simultaneous reads and writes
are not supported in single-port mode. Figure 3–7 shows the single-port RAM
configuration.
Figure 3–7. Single-Port RAM ⁽¹⁾
data[ ]
address[ ]
wren
byteena[]
addressstall
inclock
clockena
rden
aclr
q[]
outclock
Note to Figure 3–7:
(1) You can implement two single-port memory blocks in a single M9K or M144K block. For more information, refer to
“Packed Mode Support” on page 3–5.
During a write operation, RAM output behavior is configurable. If you use the
read-enable signal and perform a write operation with read enable de-activated, the
RAM outputs retain the values they held during the most recent active read enable. If
you activate read enable during a write operation, or if you are not using the
read-enable signal at all, the RAM outputs either show the “new data” being written,
the “old data” at that address, or a “don’t care” value. To choose the desired behavior,
set the read-during-write behavior to either new data, old data, or don’t care in the
RAM MegaWizard Plug-In Manager in the Quartus II software. For more information,
refer to “Read-During-Write Behavior” on page 3–19.
Table 3–4 lists the possible port width configurations for TriMatrix memory blocks in
single-port mode.
Table 3–4. Port Width Configurations for MLABs, M9K, and M144K Blocks (Single-Port Mode)
MLABs
M9K Blocks
M144K Blocks
Port Width
Configurations
64 × 8
64 × 9
64 × 10
32 × 16
32 × 18
32 × 20
8K × 1
4K × 2
2K × 4
1K × 8
1K × 9
512 × 16
512 × 18
256 × 32
256 × 36
16K × 8
16K × 9
8K × 16
8K × 18
4K × 32
4K × 36
2K × 64
2K × 72
Stratix IV Device Handbook
Volume 1
December 2011 Altera Corporation