參數(shù)資料
型號: XC3S500E-4FT256I
廠商: Xilinx Inc
文件頁數(shù): 35/227頁
文件大?。?/td> 0K
描述: IC FPGA SPARTAN 3E 256FTBGA
標準包裝: 90
系列: Spartan®-3E
LAB/CLB數(shù): 1164
邏輯元件/單元數(shù): 10476
RAM 位總計: 368640
輸入/輸出數(shù): 190
門數(shù): 500000
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: 256-LBGA
供應商設備封裝: 256-FTBGA
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Spartan-3E FPGA Family: Functional Description
DS312 (v4.1) July 19, 2013
Product Specification
13
Storage Element Functions
There are three pairs of storage elements in each IOB, one
pair for each of the three paths. It is possible to configure
each of these storage elements as an edge-triggered
D-type flip-flop (FD) or a level-sensitive latch (LD).
The storage-element pair on either the Output path or the
Three-State path can be used together with a special
multiplexer to produce Double-Data-Rate (DDR)
transmission. This is accomplished by taking data
synchronized to the clock signal’s rising edge and
converting it to bits synchronized on both the rising and the
falling edge. The combination of two registers and a
multiplexer is referred to as a Double-Data-Rate D-type
flip-flop (ODDR2).
Table 4 describes the signal paths associated with the
storage element.
As shown in Figure 5, the upper registers in both the output
and three-state paths share a common clock. The OTCLK1
clock signal drives the CK clock inputs of the upper registers
on the output and three-state paths. Similarly, OTCLK2
drives the CK inputs for the lower registers on the output
and three-state paths. The upper and lower registers on the
input path have independent clock lines: ICLK1 and ICLK2.
The OCE enable line controls the CE inputs of the upper
and lower registers on the output path. Similarly, TCE
controls the CE inputs for the register pair on the three-state
path and ICE does the same for the register pair on the
input path.
The Set/Reset (SR) line entering the IOB controls all six
registers, as is the Reverse (REV) line.
In addition to the signal polarity controls described in IOB
Overview, each storage element additionally supports the
controls described in Table 5.
Table 4: Storage Element Signal Description
Storage
Element
Signal
Description
Function
D
Data input
Data at this input is stored on the active edge of CK and enabled by CE. For latch operation when
the input is enabled, data passes directly to the output Q.
Q
Data output
The data on this output reflects the state of the storage element. For operation as a latch in
transparent mode, Q mirrors the data at D.
CK
Clock input
Data is loaded into the storage element on this input’s active edge with CE asserted.
CE
Clock Enable input
When asserted, this input enables CK. If not connected, CE defaults to the asserted state.
SR
Set/Reset input
This input forces the storage element into the state specified by the SRHIGH/SRLOW attributes.
The SYNC/ASYNC attribute setting determines if the SR input is synchronized to the clock or not.
If both SR and REV are active at the same time, the storage element gets a value of 0.
REV
Reverse input
This input is used together with SR. It forces the storage element into the state opposite from what
SR does. The SYNC/ASYNC attribute setting determines whether the REV input is synchronized
to the clock or not. If both SR and REV are active at the same time, the storage element gets a
value of 0.
Table 5: Storage Element Options
Option Switch
Function
Specificity
FF/Latch
Chooses between an edge-triggered flip-flop or a
level-sensitive latch
Independent for each storage element
SYNC/ASYNC
Determines whether the SR set/reset control is
synchronous or asynchronous
Independent for each storage element
SRHIGH/SRLOW
Determines whether SR acts as a Set, which forces
the storage element to a logic 1 (SRHIGH) or a
Reset, which forces a logic 0 (SRLOW)
Independent for each storage element, except when using
ODDR2. In the latter case, the selection for the upper
element will apply to both elements.
INIT1/INIT0
When Global Set/Reset (GSR) is asserted or after
configuration this option specifies the initial state of
the storage element, either set (INIT1) or reset
(INIT0). By default, choosing SRLOW also selects
INIT0; choosing SRHIGH also selects INIT1.
Independent for each storage element, except when using
ODDR2, which uses two IOBs. In the ODDR2 case,
selecting INIT0 for one IOBs applies to both elements
within the IOB, although INIT1 could be selected for the
elements in the other IOB.
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XC3S500E-4FT256I4003 制造商:Xilinx 功能描述:
XC3S500E-4FTG256C 功能描述:IC SPARTAN-3E FPGA 500K 256-FTBG RoHS:是 類別:集成電路 (IC) >> 嵌入式 - FPGA(現(xiàn)場可編程門陣列) 系列:Spartan®-3E 標準包裝:60 系列:XP LAB/CLB數(shù):- 邏輯元件/單元數(shù):10000 RAM 位總計:221184 輸入/輸出數(shù):244 門數(shù):- 電源電壓:1.71 V ~ 3.465 V 安裝類型:表面貼裝 工作溫度:0°C ~ 85°C 封裝/外殼:388-BBGA 供應商設備封裝:388-FPBGA(23x23) 其它名稱:220-1241
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