| US 7,590,676 B1 | ||
| Programmable logic device with specialized multiplier blocks | ||
| Martin Langhammer, Alderbury (United Kingdom) | ||
| Assigned to Altera Corporation, San Jose, Calif. (US) | ||
| Filed on Sep. 27, 2005, as Appl. No. 11/238,040. | ||
| Int. Cl. G06F 17/10 (2006.01) | ||
| U.S. Cl. 708—319 [708/316] | 26 Claims |
| 1. A specialized multiplier block for use in a programmable logic device, said specialized multiplier block comprising:
a plurality of multipliers having multiplier inputs;
at least one input register chain, at least one input of each of said multipliers being connected to said input register chain;
a plurality of adders;
programmable connections between said multipliers and said adders whereby said specialized multiplier block is configurable
as a Direct Form II finite impulse response filter; and
an output register for chaining output of said Direct Form II finite impulse response filter to another said specialized multiplier
block; wherein:
said specialized multiplier block is configurable with others of said specialized multiplier block as a long Direct Form II
finite impulse response filter.
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