參數(shù)資料
型號: EP20K1500CF1020C9
英文描述: ASIC
中文描述: 專用集成電路
文件頁數(shù): 23/114頁
文件大?。?/td> 1623K
代理商: EP20K1500CF1020C9
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)]
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EP20K1500CF1020I7 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC
EP20K1500CF1020I8 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC
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EP20K1500E 制造商:ALTERA 制造商全稱:Altera Corporation 功能描述:Programmable Logic Device Family
EP20K1500EBC652-1 功能描述:FPGA - 現(xiàn)場可編程門陣列 CPLD - APEX 20K 3456 Macros 488 IO RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-256