- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄362745 > EPF8636A (Altera Corporation) PROGRAMMABLE LOGIC DEVICES FAMILY PDF資料下載
參數(shù)資料
| 型號： | EPF8636A |
| 廠商： | Altera Corporation |
| 英文描述： | PROGRAMMABLE LOGIC DEVICES FAMILY |
| 中文描述： | 系列可編程邏輯元件 |
| 文件頁數(shù)： | 8/61頁 |
| 文件大小： | 979K |
| 代理商： | EPF8636A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁當(dāng)前第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁
8
Altera Corporation
FLEX 8000 Programmable Logic Device Family Data Sheet
The FLEX 8000 architecture provides two dedicated high-speed data
paths—carry chains and cascade chains—that connect adjacent LEs
without using local interconnect paths. The carry chain supports high-
speed counters and adders; the cascade chain implements wide-input
functions with minimum delay. Carry and cascade chains connect all LEs
in an LAB and all LABs in the same row. Heavy use of carry and cascade
chains can reduce routing flexibility. Therefore, the use of carry and
cascade chains should be limited to speed-critical portions of a design.
Carry Chain
The carry chain provides a very fast (less than 1 ns) carry-forward
function between LEs. The carry-in signal from a lower-order bit moves
forward into the higher-order bit via the carry chain, and feeds into both
the LUT and the next portion of the carry chain. This feature allows the
FLEX 8000 architecture to implement high-speed counters and adders of
arbitrary width. The MAX+PLUS II Compiler can create carry chains
automatically during design processing; designers can also insert carry
chain logic manually during design entry.
Figure 4
shows how an
n
-bit full adder can be implemented in
n
+ 1 LEs
with the carry chain. One portion of the LUT generates the sum of two bits
using the input signals and the carry-in signal; the sum is routed to the
output of the LE. The register is typically bypassed for simple adders, but
can be used for an accumulator function. Another portion of the LUT and
the carry chain logic generate the carry-out signal, which is routed directly
to the carry-in signal of the next-higher-order bit. The final carry-out
signal is routed to another LE, where it can be used as a general-purpose
signal. In addition to mathematical functions, carry chain logic supports
very fast counters and comparators.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EPF8820A | LED, BLUE 6 MCD 20 MA |
| EPG1280 | 8 BIT UC BASED DATA PROCESSOR IC FOR USE ON PAIM TOP DEVICES |
| EPG6400 | 8 BIT UC BASED DATA PROCESSOR IC FOR USE ON PAIM TOP DEVICES |
| EPI270172G4036 | Contents Surface Mount Power Inductor |
| EPI0L8502KSP56 | Contents Surface Mount Power Inductor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EPF8636AGC192-2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Field Programmable Gate Array (FPGA) |
| EPF8636AGC192-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Field Programmable Gate Array (FPGA) |
| EPF8636AGC192-4 | 制造商:Altera Corporation 功能描述:Field-Programmable Gate Array, 504 Cell, 192 Pin, Ceramic, PGA |
| EPF8636AGC192-5 | 制造商:Altera Corporation 功能描述:Field-Programmable Gate Array, 504 Cell, 192 Pin, Ceramic, PGA |
| EPF8636AGI192-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Field Programmable Gate Array (FPGA) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。