EP1S20F484C6N Altera, EP1S20F484C6N Datasheet - Page 515

• Manufacturer Part Number: EP1S20F484C6N
• Description: IC STRATIX FPGA 20K LE 484-FBGA
• Manufacturer: Altera
• Series: Stratix®r

Specifications of EP1S20F484C6N

• Number Of Logic Elements/cells: 18460
• Number Of Labs/clbs: 1846
• Total Ram Bits: 1669248
• Number Of I /o: 361
• Voltage - Supply: 1.425 V ~ 1.575 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: -

Altera Corporation
July 2005
SERDES Bypass DDR Differential Signaling Receiver Operation
The SERDES bypass differential signaling receiver uses the Stratix device
DDR input circuitry to receive high-speed serial data. The DDR input
circuitry consists of a pair of shift registers used to capture the high-speed
serial data, and a latch.
One register captures the data on the positive edge of the clock (generated
by PLL) and the other register captures the data on the negative edge of
the clock. Because the data captured on the negative edge is delayed by
one-half of the clock cycle, it is latched before it interfaces with the system
logic.
Figure 5–28
serial data and the clock. In this example, the inclock signal is running
at half the speed of the incoming data. However, other combinations are
also possible.
used in a Flexible-LVDS receiver design to interface with the system logic.
Figure 5–28.
neg_reg_out
dataout_h
dataout_l
datain
clock
shows the DDR timing relationship between the incoming
×
Figure 5–29
2 Timing Relation between Incoming Serial Data & Clock
XX
B0
XX
XX
High-Speed Differential I/O Interfaces in Stratix Devices
A0
shows the DDR input and the other modules
B0
B1
B0
A0
A1
Stratix Device Handbook, Volume 2
B1
B2
B1
A1
A2
B2
B3
B2
A2
A3
B3
5–43