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型號：	EP20K200CB652C7
英文描述：	5V, Byte Alterable EEPROM; Temperature Range: -40°C to 85°C; Package: 32-PLCC
中文描述：	專用集成電路
文件頁數(shù)：	24/114頁
文件大小：	1623K
代理商：	EP20K200CB652C7

Altera Corporation

APEX 20K Programmable Logic Device Family Data Sheet

LE Operating Modes

The APEX 20K LE can operate in one of the following three modes:

Normal mode

Arithmetic mode

Counter mode

Each mode uses LE resources differently. In each mode, seven available

inputs to the LE—the four data inputs from the LAB local interconnect,

the feedback from the programmable register, and the carry-in and

cascade-in from the previous LE—are directed to different destinations to

implement the desired logic function. LAB-wide signals provide clock,

asynchronous clear, asynchronous preset, asynchronous load,

synchronous clear, synchronous load, and clock enable control for the

The Quartus II software, in conjunction with parameterized functions

such as LPM and DesignWare functions, automatically chooses the

appropriate mode for common functions such as counters, adders, and

multipliers. If required, the designer can also create special-purpose

functions that specify which LE operating mode to use for optimal

performance. Figure 8 shows the LE operating modes.

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