参数资料
型号: EP20K100EFC784-3
厂商: ALTERA CORP
元件分类: PLD
英文描述: LOADABLE PLD, PBGA784
文件页数: 19/65页
文件大小: 781K
代理商: EP20K100EFC784-3
48
Altera Corporation
APEX 20K Programmable Logic Device Family Data Sheet
Preliminary Information
Figure 14. APEX 20K Macrocell
For registered functions, each macrocell register can be programmed
individually to implement D, T, JK, or SR operation with programmable
clock control. The register can be bypassed for combinatorial operation.
During design entry, the designer specifies the desired register type; the
Quartus software then selects the most efficient register operation for each
registered function to optimize resource utilization. The Quartus software
or other synthesis tools can also select the most efficient register operation
automatically when synthesizing HDL designs.
Each programmable register can be clocked by one of two ESB-wide
clocks. The ESB-wide clocks can be generated from device dedicated clock
pins, global signals, or local interconnect. Each clock also has an
associated clock enable, generated from the local interconnect. The clock
and clock enable signals are related for a particular ESB; any macrocell
using a clock also uses the associated clock enable.
If both the rising and falling edges of a clock are used in an ESB, both
ESB-wide clock signals are used.
Clock/
Enable
Select
Product-
Term
Select
Matrix
Parallel Logic
Expanders
(From Other
Macrocells)
ESB-Wide
Clears
ESB-Wide
Clock Enables
ESB-Wide
Clocks
32 Signals
from Local
Interconnect
Clear
Select
ESB
Output
Programmable
Register
2
ENA
D
CLRN
Q
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