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参数资料
型号： LFEC6E-5FN256C
厂商： Lattice Semiconductor Corporation
文件页数： 79/163页
文件大小： 0K
描述： IC FPGA 6.1KLUTS 256FPBGA
标准包装： 90
系列： EC
逻辑元件/单元数： 6100
RAM 位总计： 94208
输入/输出数： 195
电源电压： 1.14 V ~ 1.26 V
安装类型： 表面贴装
工作温度： 0°C ~ 85°C
封装/外壳： 256-BGA
供应商设备封装： 256-FPBGA（17x17）
2-19
Architecture
LatticeECP/EC Family Data Sheet
Signed and Unsigned with Different Widths
The DSP block supports different widths of signed and unsigned multipliers besides x9, x18 and x36 widths. For
unsigned operands, unused upper data bits should be filled to create a valid x9, x18 or x36 operand. For signed
two’s complement operands, sign extension of the most significant bit should be performed until x9, x18 or x36
width is reached. Table 2-8 provides an example of this.
Table 2-8. An Example of Sign Extension
OVERFLOW Flag from MAC
The sysDSP block provides an overflow output to indicate that the accumulator has overflowed. When two
unsigned numbers are added and the result is a smaller number then accumulator roll over is said to occur and
overflow signal is indicated. When two positive numbers are added with a negative sum and when two negative
numbers are added with a positive sum, then the accumulator “roll-over” is said to have occurred and an overflow
signal is indicated. Note when overflow occurs the overflow flag is present for only one cycle. By counting these
overflow pulses in FPGA logic, larger accumulators can be constructed. The conditions overflow signals for signed
and unsigned operands are listed in Figure 2-23.
Figure 2-23. Accumulator Overflow/Underflow Conditions
Number Unsigned
Unsigned
9-bit
Unsigned
18-bit
Signed
Two’s Complement
Signed 9-Bits
Two’s Complement
Signed 18-bits
+5
0101
000000101
000000000000000101
0101
000000101
000000000000000101
-6
0110
000000110
000000000000000110
1010
111111010
111111111111111010
000000000
000000001
000000010
000000011
111111101
111111110
111111111
Overflow signal is generated
for one cycle when this
boundary is crossed
0
+1
+2
+3
-3
-2
-1
Unsigned Operation
Signed Operation
0101111111
0101111110
0101111101
0101111100
1010000010
1010000001
1010000000
255
254
253
252
254
255
256
000000000
000000001
000000010
000000011
111111101
111111110
111111111
Carry signal is generated for
one cycle when this
boundary is crossed
0
1
2
3
509
510
511
0101111111
0101111110
0101111101
0101111100
1010000010
1010000001
1010000000
255
254
253
252
258
257
256
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LFEC6E-5FN256I 制造商:LATTICE 制造商全称:Lattice Semiconductor 功能描述:LatticeECP/EC Family Data Sheet
LFEC6E-5FN484C 功能描述:FPGA - 现场可编程门阵列 6.1 LUT 224 I/O RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 栅极数量: 逻辑块数量:943 内嵌式块RAM - EBR:1956 kbit 输入/输出端数量:128 最大工作频率:800 MHz 工作电源电压:1.1 V 最大工作温度:+ 70 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-256
LFEC6E-5FN484I 制造商:LATTICE 制造商全称:Lattice Semiconductor 功能描述:LatticeECP/EC Family Data Sheet
LFEC6E-5FN672C 制造商:LATTICE 制造商全称:Lattice Semiconductor 功能描述:LatticeECP/EC Family Data Sheet
LFEC6E-5FN672I 制造商:LATTICE 制造商全称:Lattice Semiconductor 功能描述:LatticeECP/EC Family Data Sheet
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