EP1S20F484C6N Altera, EP1S20F484C6N Datasheet - Page 614

• 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
7–36
Stratix Device Handbook, Volume 2
This cascaded structure rearranges the transfer function. This is shown in
the equation below, where each product term is a second order IIR filter.
If n is odd, the last product term is a first order IIR filter:
Figure 7–21
Figure 7–21. Cascaded IIR Filter
Basic IIR Filters
In this section, the basic IIR filter is implemented using cascaded second
order blocks or biquads in the direct form II structure.
Basic IIR FIlter Implementation
Multiplier blocks, adders and delay elements can implement a basic IIR
filter. The Stratix architecture lends itself to IIR filters because of its
embedded DSP blocks, which can easily be configured to perform these
operations. The altmult_add megafunction can be used to implement
the multiplier-adder mode in the DSP blocks.
implementation of an individual biquad using Stratix and Stratix GX DSP
blocks.
H z
x(n)
=
shows the cascaded structure.
C
C
n
H (z)
+
k
1
1
=
1
2
a
--------------------------------------------------- -
1
0k
+
+
b
a
1k
1k
z
z
1 –
H (z)
1 –
k
+
+
b
a
2k
2k
z
z
2 –
2 –
Figure 7–22
=
C
H (z)
n
n
Altera Corporation
+
k
1
=
September 2004
shows the
1
2
H
y(n)
k
z