EP4CE55F23C9LN Altera, EP4CE55F23C9LN Datasheet - Page 158

• Manufacturer Part Number: EP4CE55F23C9LN
• Description: IC CYCLONE IV FPGA 55K 484FBGA
• Manufacturer: Altera
• Series: CYCLONE® IV Er

Specifications of EP4CE55F23C9LN

• Number Of Logic Elements/cells: 55856
• Number Of Labs/clbs: 3491
• Total Ram Bits: 2340000
• Number Of I /o: 324
• Voltage - Supply: 0.97 V ~ 1.03 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 484-FBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

7–10
Figure 7–6. DQS, CQ, or CQ# Pins for Cyclone IV E Devices in the 144-Pin EQFP and 164-pin MBGA Packages
Optional Parity, DM, and Error Correction Coding Pins
Cyclone IV Device Handbook, Volume 1
Figure 7–6
banks of the Cyclone IV E device in the 144-pin EQFP and 164-pin MBGA packages.
In Cyclone IV devices, the ×9 mode uses the same DQ and DQS pins as the ×8 mode,
and one additional DQ pin that serves as a regular I/O pin in the ×8 mode. The ×18
mode uses the same DQ and DQS pins as ×16 mode, with two additional DQ pins that
serve as regular I/O pins in the ×16 mode. Similarly, the ×36 mode uses the same DQ
and DQS pins as the ×32 mode, with four additional DQ pins that serve as regular I/O
pins in the ×32 mode. When not used as DQ or DQS pins, the memory interface pins
are available as regular I/O pins.
Cyclone IV devices support parity in ×9, ×18, and ×36 modes. One parity bit is
available per eight bits of data pins. You can use any of the DQ pins for parity in
Cyclone IV devices because the parity pins are treated and configured similarly to DQ
pins.
DM pins are only required when writing to DDR2 and DDR SDRAM devices.
QDR II SRAM devices use the BWS# signal to select the byte to be written into
memory. A low signal on the DM or BWS# pin indicates the write is valid. Driving the
DM or BWS# pin high causes the memory to mask the DQ signals. Each group of DQS
and DQ signals has one DM pin. Similar to the DQ output signals, the DM signals are
clocked by the -90° shifted clock.
In Cyclone IV devices, the DM pins are preassigned in the device pinouts. The
Quartus II Fitter treats the DQ and DM pins in a DQS group equally for placement
purposes. The preassigned DQ and DM pins are the preferred pins to use.
DQS1L/CQ1L#
DQS0L/CQ1L
shows the location and numbering of the DQS, DQ, or CQ# pins in I/O
I/O Bank 8
I/O Bank 3
Cyclone IV E Devices
in 144-pin EQFP and
164-pin MBGA
I/O Bank 7
I/O Bank 4
Chapter 7: External Memory Interfaces in Cyclone IV Devices
Cyclone IV Devices Memory Interfaces Pin Support
DQS0R/CQ1R
DQS1R/CQ1R#
© December 2010 Altera Corporation