參數(shù)資料
型號(hào)： EPM3256AQI208-6
廠商： ALTERA CORP
元件分類： PLD
英文描述： EE PLD, 6 ns, PQFP208
封裝： PLASTIC, QFP-208
文件頁(yè)數(shù)： 41/43頁(yè)
文件大?。?/td> 716K
代理商： EPM3256AQI208-6
Altera Corporation
7
MAX 3000A Programmable Logic Device Family Data Sheet
Preliminary Information
The MAX+PLUS II development system automatically optimizes
product-term allocation according to the logic requirements of the design.
For registered functions, each macrocell flipflop can be individually
programmed to implement D, T, JK, or SR operation with programmable
clock control. The flipflop can be bypassed for combinatorial operation.
During design entry, the designer specifies the desired flipflop type; the
MAX+PLUS II software then selects the most efficient flipflop operation
for each registered function to optimize resource utilization.
Each programmable register can be clocked in three different modes:
s
Global clock signal. This mode achieves the fastest clock-to-output
performance.
s
Global clock signal enabled by an active-high clock enable. A clock
enable is generated by a product term. This mode provides an enable
on each flipflop while still achieving the fast clock-to-output
performance of the global clock.
s
Array clock implemented with a product term. In this mode, the
flipflop can be clocked by signals from buried macrocells or I/O pins.
Two global clock signals are available in MAX 3000A devices. As shown
in Figure 1, these global clock signals can be the true or the complement
of either of the two global clock pins, GCLK1 or GCLK2.
Each register also supports asynchronous preset and clear functions. As
shown in Figure 2, the product-term select matrix allocates product terms
to control these operations. Although the product-term-driven preset and
clear from the register are active high, active-low control can be obtained
by inverting the signal within the logic array. In addition, each register
clear function can be individually driven by the active-low dedicated
global clear pin (GCLRn).
Expander Product Terms
Although most logic functions can be implemented with the five product
terms available in each macrocell, highly complex logic functions require
additional product terms. Another macrocell can be used to supply the
required logic resources. However, the MAX 3000A architecture also
offers both shareable and parallel expander product terms (“expanders”)
that provide additional product terms directly to any macrocell in the
same LAB. These expanders help ensure that logic is synthesized with the
fewest possible logic resources to obtain the fastest possible speed.
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EPM3256ATC1447 制造商:ALTERA 功能描述:New 制造商:Altera Corporation 功能描述:
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