LFEC10E-3F256C Lattice Semiconductor Corp., LFEC10E-3F256C Datasheet - Page 25

• Manufacturer Part Number: LFEC10E-3F256C
• Description: Latticeecp/ec Family of Fpga Devices Has Been Optimized to Deliver Mainstream Fpga Features at Low Cost.for Maximum Performance And Value, The Latticeecp (EConomy Plus) Fpga Concept Combines an Efficient Fpgafabric With High-speed Dedicated Functions
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
Figure 2-15. MAC sysDSP Element
MULTADD sysDSP Element
In this case, the operands A0 and B0 are multiplied and the result is added/subtracted with the result of the multi-
plier operation of operands A1 and A2. The user can enable the input, output and pipeline registers. Figure 2-16
shows the MULTADD sysDSP element.
Figure 2-16. MULTADD
Multiplicand
Multiplier
SignedAB
Addn
Accumsload
Shift Register B Out
Multiplicand A0
Multiplicand A1
Multiplier B0
Multiplier B1
Signed
Addn
Shift Register B In
Shift Register B Out
Shift Register B In
n
Register B
Input Data
n
n
Register B
Register B
Input Data
Input Data
n
n
n
n
n
n
Register
Register
Register
n
n
Input
Input
Input
Register
Register
m
Input
Input
Input Data
Register A
m
m
Register A
Register A
Input Data
Input Data
m
n
Shift Register A Out
Shift Register A In
m
Shift Register A Out
m
m
m
Register
Register
Pipeline
Pipeline
Register
Pipeline
Shift Register A In
m
m
Register
Register
Pipeline
Pipeline
m
n
Pipe
Pipe
Reg
Reg
m
n
m
n
Accumulator
Accumulator
2-15
Multiplier
Multiplier
To
To
To
Pipeline
Register
Accumulator
x
Multiplier
Multiplier
Multiplier
Pipeline
Register
Register
Pipeline
(default)
x
x
To
To
m+n
(default)
(default)
m+n
m+n
LatticeECP/EC Family Data Sheet
Accumulator
m+n+16 bits
Add/Sub
CLK (CLK0,CLK1,CLK2,CLK3)
CE (CE0,CE1,CE2,CE3)
RST(RST0,RST1,RST2,RST3)
CLK (CLK0,CLK1,CLK2,CLK3)
CE (CE0,CE1,CE2,CE3)
RST(RST0,RST1,RST2,RST3)
(default)
(default)
m+n+1
m+n+16 bits
(default)
(default)
m+n+1
Architecture
Output
Output
Overflow
signal