參數(shù)資料
型號(hào): XC3S1200E-4FGG400I
廠商: Xilinx Inc
文件頁(yè)數(shù): 176/227頁(yè)
文件大?。?/td> 0K
描述: IC FPGA SPARTAN-3E 1200K 400FBGA
標(biāo)準(zhǔn)包裝: 60
系列: Spartan®-3E
LAB/CLB數(shù): 2168
邏輯元件/單元數(shù): 19512
RAM 位總計(jì): 516096
輸入/輸出數(shù): 304
門數(shù): 1200000
電源電壓: 1.14 V ~ 1.26 V
安裝類型: 表面貼裝
工作溫度: -40°C ~ 100°C
封裝/外殼: 400-BGA
供應(yīng)商設(shè)備封裝: 400-FBGA(21x21)
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Spartan-3E FPGA Family: Functional Description
DS312 (v4.1) July 19, 2013
Product Specification
52
DLL Clock Output and Feedback Connections
As many as four of the nine DCM clock outputs can
simultaneously drive four of the BUFGMUX buffers on the
same die edge. All DCM clock outputs can simultaneously
drive general routing resources, including interconnect
leading to OBUF buffers.
The feedback loop is essential for DLL operation. Either the
CLK0 or CLK2X outputs feed back to the CLKFB input via a
BUFGMUX global buffer to eliminate the clock distribution
delay. The specific BUFGMUX buffer used to feed back the
CLK0 or CLK2X signal is ideally one of the BUFGMUX
buffers associated with a specific DCM, as shown in
The feedback path also phase-aligns the other seven DLL
outputs: CLK0, CLK90, CLK180, CLK270, CLKDV, CLK2X,
or CLK2X180. The CLK_FEEDBACK attribute value must
agree with the physical feedback connection. Use “1X” for
CLK0 feedback and “2X” for CLK2X feedback. If the DFS
unit is used stand-alone, without the DLL, then no feedback
is required and set the CLK_FEEDBACK attribute to
“NONE”.
Two basic cases determine how to connect the DLL clock
outputs and feedback connections: on-chip synchronization
and off-chip synchronization, which are illustrated in
In the on-chip synchronization case in Figure 42a and
Figure 42b, it is possible to connect any of the DLL’s seven
output clock signals through general routing resources to
the FPGA’s internal registers. Either a Global Clock Buffer
(BUFG) or a BUFGMUX affords access to the global clock
network. As shown in Figure 42a, the feedback loop is
created by routing CLK0 (or CLK2X) in Figure 42b to a
global clock net, which in turn drives the CLKFB input.
In the off-chip synchronization case in Figure 42c and
Figure 42d, CLK0 (or CLK2X) plus any of the DLL’s other
output clock signals exit the FPGA using output buffers
(OBUF) to drive an external clock network plus registers on
the board. As shown in Figure 42c, the feedback loop is
formed by feeding CLK0 (or CLK2X) in Figure 42d back into
the FPGA, then to the DCM’s CLKFB input via a Global
Buffer Input, specified in Table 30.
X-Ref Target - Figure 42
Figure 42: Input Clock, Output Clock, and Feedback Connections for the DLL
DS099-2_09_082104
CLK90
CLK180
CLK270
CLKDV
CLK2X
CLK2X180
CLK0
Clock
Net Delay
BUFGMUX
BUFG
FPGA
(a) On-Chip with CLK0 Feedback
CLKIN
DCM
CLKFB
CLK90
CLK180
CLK270
CLKDV
CLK2X
CLK2X180
CLK0
Clock
Net Delay
IBUFG
FPGA
(c) Off-Chip with CLK0 Feedback
CLKIN
DCM
CLKFB
OBUF
CLK2X
IBUFG
FPGA
(d) Off-Chip with CLK2X Feedback
CLKIN
DCM
CLKFB
OBUF
CLK0
CLK90
CLK180
CLK270
CLKDV
CLK2X180
CLK2X
Clock
Net Delay
Clock
Net Delay
BUFGMUX
BUFG
FPGA
(b) On-Chip with CLK2X Feedback
CLKIN
DCM
CLKFB
CLK0
CLK90
CLK180
CLK270
CLKDV
CLK2X180
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XC3S1200E-4FGG484C 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan-3E FPGA Family
XC3S1200E-4FGG484I 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan-3E FPGA Family
XC3S1200E-4FT256C 制造商:Xilinx 功能描述:FPGA SPARTAN-3E 1.2M GATES 19512 CELLS 572MHZ 90NM 1.2V 256F - Trays
XC3S1200E-4FT256CES 制造商:Xilinx 功能描述:
XC3S1200E-4FT256I 功能描述:IC FPGA SPARTAN 3E 256FTBGA RoHS:否 類別:集成電路 (IC) >> 嵌入式 - FPGA(現(xiàn)場(chǎng)可編程門陣列) 系列:Spartan®-3E 標(biāo)準(zhǔn)包裝:40 系列:Spartan® 6 LX LAB/CLB數(shù):3411 邏輯元件/單元數(shù):43661 RAM 位總計(jì):2138112 輸入/輸出數(shù):358 門數(shù):- 電源電壓:1.14 V ~ 1.26 V 安裝類型:表面貼裝 工作溫度:-40°C ~ 100°C 封裝/外殼:676-BGA 供應(yīng)商設(shè)備封裝:676-FBGA(27x27)