EP1S20F484C6N Altera, EP1S20F484C6N Datasheet - Page 616

• 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: -

Infinite Impulse Response (IIR) Filters
7–38
Stratix Device Handbook, Volume 2
The first DSP block in
adder mode, and the second DSP block is in the four-multipliers adder
mode. For an 18-bit input to the IIR filter, each biquad requires five
multipliers and five adders (two DSP blocks). One of the adders is
implemented using logic elements. Cascading several biquads together
can implement more complex, higher order IIR filters. It is possible to
insert registers in between the biquad stages to improve the performance.
Figure 7–23
biquads in three DSP blocks.
Figure 7–23. Two Cascaded Biquads
a
x[n]
a
a
a
b
b
b
b
a
a
10
20
21
11
12
11
12
21
22
22
shows a 4
Four-multipliers
adder mode
Four-multipliers
adder mode
Two-multipliers
adder mode
th
Figure 7–22
order IIR filter realized using two cascaded
block 3
block 1
block 2
DSP
DSP
DSP
is configured in the two-multipliers
Altera Corporation
September 2004
Second
biquad
biquad
First
y[n]