参数资料
型号: EP1C6T324C7ES
厂商: Altera Corporation
英文描述: Cyclone FPGA Family Data Sheet
中文描述: 气旋的FPGA系列数据手册
文件页数: 17/104页
文件大小: 763K
代理商: EP1C6T324C7ES
Altera Corporation
January 2007
2–11
Preliminary
Logic Elements
Figure 2–8
shows the carry-select circuitry in an LAB for a 10-bit full
adder. One portion of the LUT generates the sum of two bits using the
input signals and the appropriate carry-in bit; the sum is routed to the
output of the LE. The register can be bypassed for simple adders or used
for accumulator functions. Another portion of the LUT generates carry-
out bits. An LAB-wide carry-in bit selects which chain is used for the
addition of given inputs. The carry-in signal for each chain,
carry-in0
or
carry-in1
, selects the carry-out to carry forward to the carry-in
signal of the next-higher-order bit. The final carry-out signal is routed to
an LE, where it is fed to local, row, or column interconnects.
Figure 2–8. Carry Select Chain
LE4
LE3
LE2
LE1
A1
B1
A2
B2
A3
B3
A4
B4
Sum1
Sum2
Sum3
Sum4
LE10
LE9
LE8
LE7
A7
B7
A8
B8
A9
B9
A10
B10
Sum7
LE6
A6
B6
Sum6
LE5
A5
B5
Sum5
Sum8
Sum9
Sum10
0
1
0
1
LAB Carry-In
LAB Carry-Out
LUT
LUT
LUT
LUT
data1
data2
LAB Carry-In
Carry-In0
Carry-In1
Carry-Out0
Carry-Out1
Sum
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