參數(shù)資料
型號(hào)： EP20K400EQC240-1
廠商： ALTERA CORP
元件分類(lèi)： PLD
英文描述： LOADABLE PLD, PQFP240
封裝： PLASTIC, QFP-240
文件頁(yè)數(shù)： 5/65頁(yè)
文件大小： 781K
代理商： EP20K400EQC240-1
Altera Corporation
35
Preliminary Information
APEX 20K Programmable Logic Device Family Data Sheet
The APEX 20K architecture provides two types of dedicated high-speed
data paths that connect adjacent LEs without using local interconnect
paths: carry chains and cascade chains. A carry chain supports high-speed
arithmetic functions such as counters and adders, while a cascade chain
implements wide-input functions such as equality comparators with
minimum delay. Carry and cascade chains connect LEs 1 through 10 in an
LAB and all LABs in the same MegaLAB structure.
Carry Chain
The carry chain provides a very fast carry-forward function between LEs.
The carry-in signal from a lower-order bit drives 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 APEX 20K architecture
to implement high-speed counters, adders, and comparators of arbitrary
width. Carry chain logic can be created automatically by the Quartus
Compiler during design processing, or manually by the designer during
design entry. Parameterized functions such as library of parameterized
modules (LPM) and DesignWare functions automatically take advantage
of carry chains for the appropriate functions.
The Quartus Compiler creates carry chains longer than ten LEs by linking
LABs together automatically. For enhanced fitting, a long carry chain
skips alternate LABs in a MegaLAB structure. A carry 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 6 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 can be bypassed for simple adders or used
for accumulator functions. Another portion of the LUT and the carry
chain logic generates 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 an LE, where it is driven onto the local, MegaLAB, or FastTrack
Interconnect routing structures.
相關(guān)PDF資料
PDF描述
EP20K400EQC240-2 LOADABLE PLD, PQFP240
EP20K400EQI240-1 LOADABLE PLD, PQFP240
EP20K400EQI240-2 LOADABLE PLD, PQFP240
EP20K400EQI240-3 LOADABLE PLD, PQFP240
EP20K400ERC240-1 LOADABLE PLD, PQFP240
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EP20K400FC672-1 功能描述:FPGA - 現(xiàn)場(chǎng)可編程門(mén)陣列 CPLD - APEX 20K 1664 Macros 502 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
EP20K400FC672-1ES 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:FPGA
EP20K400FC672-1X 功能描述:FPGA - 現(xiàn)場(chǎng)可編程門(mén)陣列 CPLD - APEX 20K 1664 Macros 502 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
EP20K400FC672-2 功能描述:FPGA - 現(xiàn)場(chǎng)可編程門(mén)陣列 CPLD - APEX 20K 1664 Macros 502 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
EP20K400FC672-2ES 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:FPGA
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