EP3C25F256C7N Altera, EP3C25F256C7N Datasheet - Page 107

• Manufacturer Part Number: EP3C25F256C7N
• Description: IC CYCLONE III FPGA 256-FBGA
• Manufacturer: Altera
• Series: Cyclone® IIIr

Specifications of EP3C25F256C7N

• Number Of Logic Elements/cells: 24624
• Number Of Labs/clbs: 1539
• Total Ram Bits: 608256
• Number Of I /o: 156
• Voltage - Supply: 1.15 V ~ 1.25 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 256-FBGA
• Family Name: Cyclone III
• Number Of Logic Blocks/elements: 24624
• # I/os (max): 156
• Frequency (max): 437.5MHz
• Process Technology: 65nm
• Operating Supply Voltage (typ): 1.2V
• Logic Cells: 24624
• Ram Bits: 608256
• Operating Supply Voltage (min): 1.15V
• Operating Supply Voltage (max): 1.25V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 256
• Package Type: FBGA
• For Use With: 544-2370 - KIT STARTER CYCLONE III EP3C25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -
• Lead Free Status / Rohs Status: Compliant
• Other names: Q4433068

Chapter 6: I/O Features in the Cyclone III Device Family
OCT Support
LVDS Transmitter Programmable Pre-Emphasis
OCT Support
Table 6–3. Selectable I/O Drivers for On-Chip Series Termination with and Without Calibration Setting (Part 1 of 2)
© December 2009
3.0-V LVTTL/LVCMOS
2.5-V LVTTL/LVCMOS
1.8-V LVTTL/LVCMOS
1.5-V LVCMOS
1.2-V LVCMOS
SSTL-2 Class I
SSTL-2 Class II
I/O Standard
f
1
Altera Corporation
The Cyclone III device family true LVDS transmitter supports programmable
pre-emphasis. Programmable pre-emphasis is used to compensate the
frequency-dependent attenuation of the transmission line. It increases the amplitude
of the high-frequency components of the output signal, which cancels out much of the
high-frequency loss of the transmission line.
The Quartus II software allows two settings for programmable pre-emphasis
control—0 and 1, in which 0 is pre-emphasis off and 1 is pre-emphasis on. The default
setting is 1. The amount of pre-emphasis needed depends on the amplification of the
high-frequency components along the transmission line. You must adjust the setting
to suit your designs, as pre-emphasis decreases the amplitude of the low-frequency
component of the output signal as well.
For more information about the Cyclone III device family high-speed differential
interface support, refer to the
chapter.
The Cyclone III device family features OCT to provide I/O impedance matching and
termination capabilities. OCT helps to prevent reflections and maintain signal
integrity while minimizing the need for external resistors in high pin-count ball grid
array (BGA) packages. The Cyclone III device family provides I/O driver on-chip
impedance matching and on-chip series termination for single-ended outputs and
bidirectional pins.
When using on-chip series termination, programmable current strength is not
available.
There are two ways to implement OCT in the Cyclone III device family:
■
■
Table 6–3
termination.
On-Chip Series Termination with Calibration
OCT with calibration
OCT without calibration
Row I/O
50, 25
50, 25
50, 25
50, 25
lists the I/O standards that support impedance matching and series
50
50
25
Setting, in ohms (Ω)
Column I/O
50, 25
50, 25
50, 25
50, 25
50, 25
High-Speed Differential Interfaces in Cyclone III Devices
50
25
On-Chip Series Termination Without Calibration
Row I/O
50, 25
50, 25
50, 25
50, 25
50
50
25
Setting, in ohms (Ω)
Cyclone III Device Handbook, Volume 1
Column I/O
50, 25
50, 25
50, 25
50, 25
50, 25
50
25
6–7