EP1S20F484C6N Altera, EP1S20F484C6N Datasheet - Page 534

• 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: -

Software Support
5–62
Stratix Device Handbook, Volume 2
Deserialization Factor
Use the What is the deserialization factor? parameter to specify the
number of bits per channel. The Stratix LVDS receiver supports 4, 7, 8,
and 10 for deserialization factor (J) values. Based on the factor specified,
the Quartus II software determines the multiplication and/or division
factor for the LVDS PLL to deserialize the data.
See
for the n
LSB (rx_out bit [J
total width of the receiver rx_out port is equal to the number of channels
multiplied by your deserialization factor.
Input Data Rate
The What is the inclock boost(W)? parameter sets the data rate coming
into the receiver and is usually the deserialization factor (J) multiplied by
the inclock frequency. This parameter’s value must be larger than the
input clock frequency and has a maximum input data rate of 840 Mbps
for Stratix devices. You do not have to provide a value for the inclock
boost (W) when designing with Stratix devices because the Quartus II
software can calculate it automatically from this parameter and the clock
frequency or clock period.
The rx_outclock frequency is (W/J)
data coming out of the receiver has the same frequency as the
rx_outclock port. The clock-to-data alignment of the parallel data
output from the receiver depends on the What is the alignment of data
with respect to rx_inclock? parameter.
Data Alignment with Clock
The What is the alignment of data with respect to rx_inclock? parameter
adjusts the clock-to-data skew. For most applications, the data is source
synchronous to the clock. However, there are applications where you
must center-align the data with respect to the clock. You can use the What
is the alignment of data with respect to rx_inclock? parameter to align
the input data with respect to the rx_inclock port. The MegaWizard
Plug-In automatically calculates the phase for the fast PLL outputs from
the What is the alignment of data with respect to rx_inclock? parameter.
This parameter’s default value is EDGE_ALIGNED, and other values
available from the pull-down menu are EDGE_ALIGNED,
CENTER_ALIGNED, 45_DEGREES, 135_DEGREES, 180_DEGREES,
225_DEGREES, 270_DEGREES, and 315_DEGREES. CENTER_ALIGNED
is the same as 90 degrees aligned and is useful for applications like
HyperTransport technology.
Table 5–5
th
channel spans from the MSB (rx_out bit [(J
for the differential bit naming convention. The parallel data
×
(n – 1)]), where J is the deserialization factor. The
×
input frequency. The parallel
Altera Corporation
×
n) – 1]) to the
July 2005