EP1S40B956C5 Altera, EP1S40B956C5 Datasheet - Page 482

• Manufacturer Part Number: EP1S40B956C5
• Description: IC STRATIX FPGA 40K LE 956-BGA
• Manufacturer: Altera
• Series: Stratix®r

Specifications of EP1S40B956C5

• Number Of Logic Elements/cells: 41250
• Number Of Labs/clbs: 4125
• Total Ram Bits: 3423744
• Number Of I /o: 683
• Voltage - Supply: 1.425 V ~ 1.575 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 956-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Gates: -

Principles of SERDES Operation
Figure 5–6. Transmitter Timing Diagram
5–10
Stratix Device Handbook, Volume 2
Internal ×10 clock
Internal ×1 clock
TXLOADEN
data input
Receiver
n – 1
Transmitter Clock Output
Different applications and protocols call for various clocking schemes.
Some applications require you to center-align the rising or falling clock
edge with the data. Other applications require a divide version of the
transmitted clock, or the clock and data to be at the same high-speed
frequency. The Stratix device transmitter clock output is versatile and
easily programmed for all such applications.
Stratix devices transmit data using the source-synchronous scheme,
where the clock is transmitted along with the serialized data to the
receiving device. Unlike APEX
devices do not have a fixed transmitter clock output pin. The Altera
Quartus II software generates the transmitter clock output by using a fast
clock to drive a transmitter dataout channel. Therefore, you can place
the transmitter clock pair close to the data channels, reducing clock-to-
data skew and increasing system margins. This approach is more flexible,
as any channel can drive a clock, not just specially designated clock pins.
Divided-Down Transmitter Clock Output
You can divide down the high-frequency clock by 2, 4, 8, or 10, depending
on the system requirements. The various options allow Stratix devices to
accommodate many different types of protocols. The divided-down clock
is generated by an additional transmitting data channel.
n – 0
9
8
7
6
TM
20KE and APEX II devices, Stratix
5
4
3
2
Altera Corporation
1
0
July 2005
®