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| 型號： | EP1K50FI484-2F |
| 英文描述： | Field Programmable Gate Array (FPGA) |
| 中文描述： | 現(xiàn)場可編程門陣列（FPGA） |
| 文件頁數(shù)： | 11/86頁 |
| 文件大小： | 1263K |
| 代理商： | EP1K50FI484-2F |
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Altera Corporation
19
ACEX 1K Programmable Logic Device Family Data Sheet
Development
13
Tools
Cascade Chain
With the cascade chain, the ACEX 1K architecture can implement
functions that have a very wide fan-in. Adjacent LUTs can be used to
compute portions of the 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. With a delay as low as 0.6 ns per LE, each additional LE
provides four more inputs to the effective width of a function. Cascade
chain logic can be created automatically by the compiler during design
processing, or manually by the designer during design entry.
Cascade chains longer than eight bits are implemented automatically by
linking several LABs together. For easier routing, a long cascade chain
skips every other LAB in a row. A cascade chain longer than one LAB
skips either from even-numbered LAB to even-numbered LAB, or from
odd-numbered LAB to odd-numbered LAB (e.g., the last LE of the first
LAB in a row cascades to the first LE of the third LAB). The cascade chain
does not cross the center of the row (e.g., in the EP1K50 device, the cascade
chain stops at the eighteenth LAB, and a new one begins at the nineteenth
LAB). This break is due to the EAB’s placement in the middle of the row.
Figure 10 shows how the cascade function can connect adjacent LEs to
form functions with a wide fan-in. These examples show functions of 4n
variables implemented with n LEs. The LE delay is 1.3 ns; the cascade
chain delay is 0.6 ns. With the cascade chain, decoding a 16-bit address
requires 3.1 ns.
Figure 10. ACEX 1K Cascade Chain Operation
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)]
相關PDF資料 |
PDF描述 |
|---|---|
| EP1K50FI484-2P | Field Programmable Gate Array (FPGA) |
| EP1K50FI484-2X | Field Programmable Gate Array (FPGA) |
| EP1K50FI484-3F | Field Programmable Gate Array (FPGA) |
| EP1K50QC208-1DX | Field Programmable Gate Array (FPGA) |
| EP1K50QC208-1F | Field Programmable Gate Array (FPGA) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EP1K50FI484-2P | 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) |
| EP1K50FI484-2X | 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) |
| EP1K50FI484-3F | 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) |
| EP1K50QC2081 | 制造商:ALTERA 功能描述:* |
| EP1K50QC208-1 | 功能描述:FPGA - 現(xiàn)場可編程門陣列 FPGA - ACEX 1K 360 LABs 147 IOs 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 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-256 |
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