EP4CE55F23C7 Altera, EP4CE55F23C7 Datasheet - Page 44

• Manufacturer Part Number: EP4CE55F23C7
• Description: IC CYCLONE IV FPGA 55K 484FBGA
• Manufacturer: Altera
• Series: CYCLONE® IV Er

Specifications of EP4CE55F23C7

• Number Of Logic Elements/cells: 55856
• Number Of Labs/clbs: 3491
• Total Ram Bits: 2340000
• Number Of I /o: 324
• Voltage - Supply: 1.15 V ~ 1.25 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 484-FBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Gates: -

3–8
Cyclone IV Device Handbook, Volume 1
During a write operation, the behavior of the RAM outputs is configurable. If you
activate rden during a write operation, the RAM outputs show either the new data
being written or the old data at that address. If you perform a write operation with
rden deactivated, the RAM outputs retain the values they held during the most
recent active rden signal.
To choose the desired behavior, set the Read-During-Write option to either New Data
or Old Data in the RAM MegaWizard Plug-In Manager in the Quartus II software.
For more information about read-during-write mode, refer to
Operations” on page
The port width configurations for M9K blocks in single-port mode are as follow:
■
■
■
■
■
■
■
■
■
Figure 3–7
mode with unregistered outputs. Registering the outputs of the RAM simply delays
the q output by one clock cycle.
Figure 3–7. Cyclone IV Devices Single-Port Mode Timing Waveform
8192 × 1
4096 × 2
2048 × 4
1024 × 8
1024 × 9
512 × 16
512 × 18
256 × 32
256 × 36
q_a (new data)
q_a (old data)
address_a
wren_a
rden_a
data_a
shows a timing waveform for read and write operations in single-port
clk_a
3–15.
A
a0(old data)
A
a0
B
B
A
C
C
B
Chapter 3: Memory Blocks in Cyclone IV Devices
D
a1(old data)
D
© November 2009 Altera Corporation
a1
“Read-During-Write
E
E
D
F
Memory Modes
F
E