- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375033 > XCV812E-6FG676I (Xilinx, Inc.) Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays PDF資料下載
參數(shù)資料
| 型號： | XCV812E-6FG676I |
| 廠商： | Xilinx, Inc. |
| 英文描述： | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| 中文描述： | 的Virtex娥內(nèi)存擴展1.8伏現(xiàn)場可編程門陣列 |
| 文件頁數(shù)： | 41/116頁 |
| 文件大?。?/td> | 1087K |
| 代理商： | XCV812E-6FG676I |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁當前第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁
Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
DS025-2 (v2.1) July 17, 2002
www.xilinx.com
1-800-255-7778
Module 2 of 4
37
R
IOB Flip-Flop/Latch Property
The Virtex-E series I/O block (IOB) includes an optional reg-
ister on the input path, an optional register on the output
path, and an optional register on the 3-state control pin. The
design implementation software automatically takes advan-
tage of these registers when the following option for the Map
program is specified.
map -pr b <filename>
Alternatively, the IOB = TRUE property can be placed on a
register to force the mapper to place the register in an IOB.
Location Constraints
Specify the location of each SelectI/O symbol with the loca-
tion constraint LOC attached to the SelectI/O symbol. The
external port identifier indicates the value of the location
constrain. The format of the port identifier depends on the
package chosen for the specific design.
The LOC properties use the following form.
LOC=A42
LOC=P37
Output Slew Rate Property
As mentioned above, a variety of symbol names provide the
option of choosing the desired slew rate for the output buff-
ers. In the case of the LVTTL output buffers (OBUF, OBUFT,
and IOBUF), slew rate control can be alternatively pro-
gramed with the SLEW= property. By default, the slew rate
for each output buffer is reduced to minimize power bus
transients when switching non-critical signals. The SLEW=
property has one of the two following values.
SLEW=SLOW
SLEW=FAST
Output Drive Strength Property
The desired output drive strength can be additionally speci-
fied by choosing the appropriate library symbol. The Xilinx
library also provides an alternative method for specifying
this feature. For the LVTTL output buffers (OBUF, OBUFT,
and IOBUF, the desired drive strength can be specified with
the DRIVE= property. This property could have one of the
following seven values.
DRIVE=4
DRIVE=6
DRIVE=8
DRIVE=12 (Default)
DRIVE=16
DRIVE=24
Design Considerations
Reference Voltage (V
REF
) Pins
Low-voltage I/O standards with a differential amplifier input
buffer require an input reference voltage (V
REF
). Provide the
V
REF
as an external signal to the device.
The voltage reference signal is “banked” within the device on
a half-edge basis such that for all packages there are eight
independent V
REF
banks internally. See
Figure 38
for a rep-
resentation of the Virtex-E I/O banks. Within each bank
approximately one of every six I/O pins is automatically con-
figured as a V
REF
input. After placing a differential amplifier
input signal within a given V
REF
bank, the same external
source must drive all I/O pins configured as a V
REF
input.
Within each V
REF
bank, any input buffers that require a
V
REF
signal must be of the same type. Output buffers of any
type and input buffers can be placed without requiring a ref-
erence voltage within the same V
REF
bank.
Output Drive Source Voltage (V
CCO
) Pins
Many of the low voltage I/O standards supported by
SelectI/O devices require a different output drive source
voltage (V
CCO
). As a result each device can often have to
support multiple output drive source voltages.
The Virtex-E series supports eight banks for the HQ and PQ
packages. The CS package supports four V
CCO
banks.
Output buffers within a given V
CCO
bank must share the
same output drive source voltage. Input buffers for LVTTL,
LVCMOS2, LVCMOS18, PCI33_3, and PCI 66_3 use the
V
CCO
voltage for Input V
CCO
voltage.
Transmission Line Effects
The delay of an electrical signal along a wire is dominated
by the rise and fall times when the signal travels a short dis-
tance. Transmission line delays vary with inductance and
capacitance, but a well-designed board can experience
delays of approximately 180 ps per inch.
Transmission line effects, or reflections, typically start at
1.5" for fast (1.5 ns) rise and fall times. Poor (or non-exis-
tent) termination or changes in the transmission line imped-
ance cause these reflections and can cause additional
delay in longer traces. As system speeds continue to
increase, the effect of I/O delays can become a limiting fac-
tor and therefore transmission line termination becomes
increasingly more important.
Termination Techniques
A variety of termination techniques reduce the impact of
transmission line effects.
The following are output termination techniques:
None
Series
Parallel (Shunt)
Series and Parallel (Series-Shunt)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XCV812E-6FG900C | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-6FG900I | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7BG404C | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7BG404I | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7BG556C | Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XCV812E-6FG900C | 功能描述:IC FPGA 1.8V C-TEMP 900-FBGA RoHS:否 類別:集成電路 (IC) >> 嵌入式 - FPGA（現(xiàn)場可編程門陣列） 系列:Virtex®-E EM 產(chǎn)品變化通告:XC4000(E,L) Discontinuation 01/April/2002 標準包裝:24 系列:XC4000E/X LAB/CLB數(shù):100 邏輯元件/單元數(shù):238 RAM 位總計:3200 輸入/輸出數(shù):80 門數(shù):3000 電源電壓:4.5 V ~ 5.5 V 安裝類型:表面貼裝 工作溫度:-40°C ~ 100°C 封裝/外殼:120-BCBGA 供應(yīng)商設(shè)備封裝:120-CPGA（34.55x34.55） |
| XCV812E-6FG900I | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7BG404C | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7BG404I | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
| XCV812E-7BG556C | 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。