參數(shù)資料
型號: LFXP20E-5FN484C
廠商: LATTICE SEMICONDUCTOR CORP
元件分類: FPGA
中文描述: FPGA, 2464 CLBS, PBGA484
封裝: 23 X 23 MM, LEAD FREE, FPBGA-484
文件頁數(shù): 44/130頁
文件大?。?/td> 1312K
代理商: LFXP20E-5FN484C
2-17
Architecture
Lattice Semiconductor
LatticeXP Family Data Sheet
in selected blocks the input to the DQS delay block. If one of the bypass options is not chosen, the signal first
passes through an optional delay block. This delay, if selected, ensures no positive input-register hold-time require-
ment when using a global clock.
The input block allows two modes of operation. In the single data rate (SDR) the data is registered, by one of the
registers in the single data rate sync register block, with the system clock. In the DDR Mode two registers are used
to sample the data on the positive and negative edges of the DQS signal creating two data streams, D0 and D2.
These two data streams are synchronized with the system clock before entering the core. Further discussion on
this topic is in the DDR Memory section of this data sheet.
Figure 2-21 shows the input register waveforms for DDR operation and Figure 2-22 shows the design tool primi-
tives. The SDR/SYNC registers have reset and clock enable available.
The signal DDRCLKPOL controls the polarity of the clock used in the synchronization registers. It ensures ade-
quate timing when data is transferred from the DQS to the system clock domain. For further discussion of this topic,
see the DDR memory section of this data sheet.
Figure 2-20. Input Register Diagram
D
Q
D
Q
D
Q
D-Type
Fixed Delay
To Routing
DI
(From sysIO
Buffer)
DQS Delayed
(From DQS
Bus)
CLK0
(From Routing)
DDRCLKPOL
(From DDR Polarity
Control Bus)
INCK
INDD
Delay Block
DDR Registers
D-Type
D
Q
D
Q
D-Type
/LATCH
D-Type
IPOS0
IPOS1
SDR & Sync
Registers
D0
D2
D1
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