LFXP2-5E-5FT256I LATTICE SEMICONDUCTOR, LFXP2-5E-5FT256I Datasheet - Page 24

• Manufacturer Part Number: LFXP2-5E-5FT256I
• Description: FPGA LatticeXP2 Family 5000 Cells Flash Technology 1.2V 256-Pin FTBGA
• Manufacturer: LATTICE SEMICONDUCTOR

Specifications of LFXP2-5E-5FT256I

• Package: 256FTBGA
• Family Name: LatticeXP2
• Device Logic Units: 5000
• Typical Operating Supply Voltage: 1.2 V
• Maximum Number Of User I/os: 172
• Ram Bits: 169984
• Re-programmability Support: Yes

Lattice Semiconductor
MAC sysDSP Element
In this case, the two operands, A and B, are multiplied and the result is added with the previous accumulated value.
This accumulated value is available at the output. The user can enable the input and pipeline registers but the out-
put register is always enabled. The output register is used to store the accumulated value. The Accumulators in the
DSP blocks in LatticeXP2 family can be initialized dynamically. A registered overflow signal is also available. The
overflow conditions are provided later in this document. Figure 2-21 shows the MAC sysDSP element.
Figure 2-21. MAC sysDSP
Multiplicand
Multiplier
Signed A
Signed B
Addn
Accumsload
Serial Register B in
n
Input Data
Register B
n
n
SROB
n
Register
Register
Register
Register
Input
Input
Input
Input
m
Input Data
Register A
m
n
SROA
Serial Register A in
m
Register
Register
Register
Register
Pipeline
Pipeline
Pipeline
Pipeline
m
n
2-21
To Accumulator
To Accumulator
To Accumulator
To Accumulator
Multiplier
Register
Pipeline
x
(default)
m+n
Accumulator
CLK (CLK0,CLK1,CLK2,CLK3)
RST(RST0,RST1,RST2,RST3)
CE (CE0,CE1,CE2,CE3)
LatticeXP2 Family Data Sheet
m+n+16
(default)
Preload
(default)
m+n+16
Architecture
Output
Overflow
signal