參數(shù)資料
型號: EP1C6T256I6ES
廠商: Altera Corporation
英文描述: Cyclone FPGA Family Data Sheet
中文描述: 氣旋的FPGA系列數(shù)據(jù)手冊
文件頁數(shù): 55/104頁
文件大?。?/td> 763K
代理商: EP1C6T256I6ES
Altera Corporation
January 2007
2–49
Preliminary
I/O Structure
Figure 2–34. DDR SDRAM & FCRAM Interfacing
Programmable Drive Strength
The output buffer for each Cyclone device I/O pin has a programmable
drive strength control for certain I/O standards. The LVTTL and
LVCMOS standards have several levels of drive strength that the designer
can control. SSTL-3 class I and II, and SSTL-2 class I and II support a
minimum setting, the lowest drive strength that guarantees the I
OH
/I
OL
V
CC
GND
PLL
Phase Shifted -90
DQS
Adjacent LAB LEs
Global Clock
Resynchronizing
Global Clock
Programmable
Delay Chain
Output LE
Register
Output LE
Registers
DQ
Input LE
Registers
Input LE
Registers
LE
Register
LE
Register
Δ
t
Adjacent
LAB LEs
OE
OE LE
Register
OE LE
Register
OE
OE LE
Register
OE LE
Register
Output LE
Registers
Output LE
Register
DataA
DataB
clk
-90 clk
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