參數(shù)資料
型號(hào): LFXP2-17E-7F484C
廠(chǎng)商: LATTICE SEMICONDUCTOR CORP
元件分類(lèi): FPGA
中文描述: FPGA, 420 MHz, PBGA484
封裝: 23 X 23 MM, FPBGA-484
文件頁(yè)數(shù): 30/92頁(yè)
文件大小: 1701K
代理商: LFXP2-17E-7F484C
2-33
Architecture
Lattice Semiconductor
LatticeXP2 Family Data Sheet
Figure 2-31. DQS Local Bus
Polarity Control Logic
In a typical DDR memory interface design, the phase relationship between the incoming delayed DQS strobe and
the internal system clock (during the READ cycle) is unknown. The LatticeXP2 family contains dedicated circuits to
transfer data between these domains. To prevent set-up 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 regis-
tered in the synchronizing registers in the input register block and requires evaluation at the start of 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
DDR
Datain
PAD
DI
CLK1
CEI
PIO
sysIO
Buffer
GSR
DQS
To Sync
Reg.
DQS
To DDR
Reg.
DQS
Strobe
PAD
PIO
DQSDEL
Polarity Control
Logic
DQS
Calibration bus
from DLL
DQSXFER
Output
Register Block
Input
Register Block
DQSXFER
DCNTL[6:0]
Polarit
y
control
DQS
DI
DQSXFERDEL*
DQSXFER
DCNTL[6:0]
*DQSXFERDEL shifts ECLK1 by 90% and is not associated with a particular PIO.
DCNTL[6:0]
ECLK1
CLK1
ECLK2
ECLK1
相關(guān)PDF資料
PDF描述
LFXP20E-3FN484C
LFXP20E-5FN484C
LFXP15C-4FN256C
LFZ3508VXX GENERAL PURPOSE INDUCTOR
LFZ2805HXX GENERAL PURPOSE INDUCTOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LFXP2-17E-7F484C8W 功能描述:FPGA - 現(xiàn)場(chǎng)可編程門(mén)陣列 17KLUTs 358I/O Inst- on DSP 1.2V -7Spd RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-256
LFXP2-17E-7FN484C 功能描述:FPGA - 現(xiàn)場(chǎng)可編程門(mén)陣列 17KLUTs 358 I/O Inst -on DSP 1.2V -6 Spd RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-256
LFXP2-17E-7FN484C8W 功能描述:FPGA - 現(xiàn)場(chǎng)可編程門(mén)陣列 17KLUTs 358I/O Inst -on DSP 1.2V -7 Spd RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-256
LFXP2-17E-7FT256C 功能描述:FPGA - 現(xiàn)場(chǎng)可編程門(mén)陣列 17KLUTs 201 I/O Inst -on DSP 1.2V -7 Spd RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-256
LFXP2-17E-7FT256C8W 功能描述:FPGA - 現(xiàn)場(chǎng)可編程門(mén)陣列 17KLUTs 201 I/O Inst -on DSP 1.2V -7 Spd RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-256