参数资料
型号: EP20K200EFI484-2X
厂商: Altera
文件页数: 26/117页
文件大小: 0K
描述: IC APEX 20KE FPGA 200K 484-FBGA
产品培训模块: Three Reasons to Use FPGA's in Industrial Designs
标准包装: 60
系列: APEX-20K®
LAB/CLB数: 832
逻辑元件/单元数: 8320
RAM 位总计: 106496
输入/输出数: 376
门数: 404000
电源电压: 1.71 V ~ 1.89 V
安装类型: 表面贴装
工作温度: -40°C ~ 100°C
封装/外壳: 484-BGA
供应商设备封装: 484-FBGA(23x23)
其它名称: 544-2093
16
Altera Corporation
APEX 20K Programmable Logic Device Family Data Sheet
Cascade Chain
With the cascade chain, the APEX 20K architecture can implement
functions with a very wide fan-in. Adjacent LUTs can compute portions
of a function in parallel; the cascade chain serially connects the
intermediate values. The cascade chain can use a logical AND or logical OR
(via De Morgan’s inversion) to connect the outputs of adjacent LEs. Each
additional LE provides four more inputs to the effective width of a
function, with a short cascade delay. Cascade chain logic can be created
automatically by the Quartus II software Compiler during design
processing, or manually by the designer during design entry.
Cascade chains longer than ten LEs are implemented automatically by
linking LABs together. For enhanced fitting, a long cascade chain skips
alternate LABs in a MegaLAB structure. A cascade chain longer than one
LAB skips either from an even-numbered LAB to the next even-numbered
LAB, or from an odd-numbered LAB to the next odd-numbered LAB. For
example, the last LE of the first LAB in the upper-left MegaLAB structure
carries to the first LE of the third LAB in the MegaLAB structure. Figure 7
shows how the cascade function can connect adjacent LEs to form
functions with a wide fan-in.
Figure 7. APEX 20K Cascade Chain
LE1
LUT
LE2
LUT
d[3..0]
d[7..4]
d[(4
n – 1)..(4n – 4)]
d[3..0]
d[7..4]
LE
n
LE1
LE2
LE
n
LUT
AND Cascade Chain
OR Cascade Chain
d[(4
n – 1)..(4n – 4)]
相关PDF资料
PDF描述
EP20K200EFC484-1X IC APEX 20KE FPGA 200K 484-FBGA
EMC60DRYN-S13 CONN EDGECARD 120POS .100 EXTEND
EMC60DRYH-S13 CONN EDGECARD 120POS .100 EXTEND
RSC30DTEN CONN EDGECARD 60POS .100 EYELET
865625SLTLF CONN DSUB FEMAL 25POS CRIMP GOLD
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