EP4CGX75DF27C7N Altera, EP4CGX75DF27C7N Datasheet - Page 138

• Manufacturer Part Number: EP4CGX75DF27C7N
• Description: Cyclone IV GX
• Manufacturer: Altera
• Series: CYCLONE® IV GXr

Specifications of EP4CGX75DF27C7N

• Number Of Logic Elements/cells: 73920
• Number Of Labs/clbs: 4620
• Total Ram Bits: 4257792
• Number Of I /o: 310
• Number Of Gates: -
• Voltage - Supply: 1.16 V ~ 1.24 V
• Mounting Type: *
• Operating Temperature: 0°C ~ 85°C
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

6–30
Figure 6–14. BLVDS Topology with Cyclone IV Devices Transmitters and Receivers
Cyclone IV Device Handbook, Volume 1
100 kΩ
100 kΩ
GND
f
f
R
1
T
V
CC
Figure 6–14
pairs.
The BLVDS I/O standard is supported on the top, bottom, and right I/O banks of
Cyclone IV devices. The BLVDS transmitter uses two single-ended output buffers
with the second output buffer programmed as inverted, while the BLVDS receiver
uses a true LVDS input buffer. The transmitter and receiver share the same pins. An
output-enabled (OE) signal is required to tristate the output buffers when the LVDS
input buffer receives a signal.
For more information, refer to the
Designing with BLVDS
The BLVDS bidirectional communication requires termination at both ends of the bus
in BLVDS. The termination resistor (R
which in turn depends on the loading on the bus. Increasing the load decreases the
bus differential impedance. With termination at both ends of the bus, termination is
not required between the two signals at the input buffer. A single series resistor (R
required at the output buffer to match the output buffer impedance to the
transmission line impedance. However, this series resistor affects the voltage swing at
the input buffer. The maximum data rate achievable depends on many factors.
Altera recommends that you perform simulation using the IBIS model while
considering factors such as bus loading, termination values, and output and input
buffer location on the bus to ensure that the required performance is achieved.
For more information about BLVDS interface support in Altera devices, refer to
AN 522: Implementing Bus LVDS Interface in Supported Altera Device
50 Ω
50
Ω
Output
Data
shows a typical BLVDS topology with multiple transmitter and receiver
Input
Data
50 Ω
50 Ω
Output
Data
Cyclone IV Device Datasheet
Input
Data
T
) must match the bus differential impedance,
50 Ω
50 Ω
Output
Data
Chapter 6: I/O Features in Cyclone IV Devices
© December 2010 Altera Corporation
Input
Data
50 Ω
50 Ω
High-Speed I/O Standards Support
chapter.
Families.
V
CC
100 kΩ
100 k
GND
R
T
Ω
S
) is