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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)： | 49/130頁 |
| 文件大?。?/td> | 1312K |
| 代理商： | LFXP20E-5FN484C |
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2-22
Architecture
Lattice Semiconductor
LatticeXP Family Data Sheet
Polarity Control Logic
In a typical DDR Memory interface design, the phase relation between the incoming delayed DQS strobe and the
internal system Clock (during the READ cycle) is unknown.
The LatticeXP family contains dedicated circuits to transfer data between these domains. To prevent setup and
hold violations at the domain transfer between DQS (delayed) and the system Clock a clock polarity selector is
used. This changes the edge on which the data is registered in the synchronizing registers in the input register
block. This requires evaluation at the start of the each READ cycle for the correct clock polarity.
Prior to the READ operation in DDR memories DQS is in tristate (pulled by termination). The DDR memory device
drives DQS low at the start of the preamble state. A dedicated circuit detects this transition. This signal is used to
control the polarity of the clock to the synchronizing registers.
sysIO Buffer
Each I/O is associated with a flexible buffer referred to as a sysIO buffer. These buffers are arranged around the
periphery of the device in eight groups referred to as Banks. The sysIO buffers allow users to implement the wide
variety of standards that are found in today’s systems including LVCMOS, SSTL, HSTL, LVDS and LVPECL.
sysIO Buffer Banks
LatticeXP devices have eight sysIO buffer banks; each is capable of supporting multiple I/O standards. Each sysIO
bank has its own I/O supply voltage (VCCIO), and two voltage references VREF1 and VREF2 resources allowing each
bank to be completely independent from each other. Figure 2-28 shows the eight banks and their associated sup-
plies.
In the LatticeXP devices, single-ended output buffers and ratioed input buffers (LVTTL, LVCMOS, PCI and PCI-X) are
powered using VCCIO. LVTTL, LVCMOS33, LVCMOS25 and LVCMOS12 can also be set as a fixed threshold input
independent of VCCIO. In addition to the bank VCCIO supplies, the LatticeXP devices have a VCC core logic power sup-
ply, and a VCCAUX supply that power all differential and referenced buffers.
Each bank can support up to two separate VREF voltages, VREF1 and VREF2 that set the threshold for the refer-
enced input buffers. In the LatticeXP devices, a dedicated pin in a bank can be configured to be a reference voltage
supply pin. Each I/O is individually configurable based on the bank’s supply and reference voltages.
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相關代理商/技術參數(shù) |
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| LFXP217E5CF484C | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:LatticeXP2 Family Data Sheet |
| LFXP217E5CF484I | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:LatticeXP2 Family Data Sheet |
| LFXP217E5CF672C | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:LatticeXP2 Family Data Sheet |
| LFXP217E5CF672I | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:LatticeXP2 Family Data Sheet |
| LFXP217E5CFN484C | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:LatticeXP2 Family Data Sheet |
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