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參數(shù)資料

Altera Corporation

MAX 7000A Programmable Logic Device Data Sheet

Parallel Expanders

Parallel expanders are unused product terms that can be allocated to a

neighboring macrocell to implement fast, complex logic functions.

Parallel expanders allow up to 20 product terms to directly feed the

macrocell OR logic, with five product terms provided by the macrocell and

15 parallel expanders provided by neighboring macrocells in the LAB.

The compiler can allocate up to three sets of up to five parallel expanders

to the macrocells that require additional product terms. Each set of five

parallel expanders incurs a small, incremental timing delay (tPEXP). For

example, if a macrocell requires 14 product terms, the compiler uses the

five dedicated product terms within the macrocell and allocates two sets

of parallel expanders; the first set includes five product terms, and the

second set includes four product terms, increasing the total delay by

2 × tPEXP.

Two groups of eight macrocells within each LAB (e.g., macrocells 1

through 8 and 9 through 16) form two chains to lend or borrow parallel

expanders. A macrocell borrows parallel expanders from lower-

numbered macrocells. For example, macrocell 8 can borrow parallel

expanders from macrocell 7, from macrocells 7 and 6, or from macrocells

7, 6, and 5. Within each group of eight, the lowest-numbered macrocell

can only lend parallel expanders, and the highest-numbered macrocell

can only borrow them. Figure 4 shows how parallel expanders can be

borrowed from a neighboring macrocell.

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EPM7256AETI100-7N	功能描述:CPLD - 復(fù)雜可編程邏輯器件 CPLD - MAX 7000 256 Macro 84 IOs RoHS:否制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
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EPM7256AETI144-7N	功能描述:CPLD - 復(fù)雜可編程邏輯器件 CPLD - MAX 7000 256 Macro 36 IOs RoHS:否制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
EPM7256AFC256-10	制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Altera Corporation 功能描述:
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