The need to supply V" />
參數(shù)資料
型號(hào): XC3S1000-4FT256I
廠商: Xilinx Inc
文件頁(yè)數(shù): 68/272頁(yè)
文件大?。?/td> 0K
描述: IC FPGA SPARTAN 3 256FTBGA
標(biāo)準(zhǔn)包裝: 90
系列: Spartan®-3
LAB/CLB數(shù): 1920
邏輯元件/單元數(shù): 17280
RAM 位總計(jì): 442368
輸入/輸出數(shù): 173
門數(shù): 1000000
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(yīng)商設(shè)備封裝: 256-FTBGA
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Spartan-3 FPGA Family: Functional Description
DS099 (v3.1) June 27, 2013
Product Specification
16
The need to supply VREF and VCCO imposes constraints on which standards can be used in the same bank. See The
Organization of IOBs into Banks section for additional guidelines concerning the use of the VCCO and VREF lines.
Digitally Controlled Impedance (DCI)
When the round-trip delay of an output signal—i.e., from output to input and back again—exceeds rise and fall times, it is
common practice to add termination resistors to the line carrying the signal. These resistors effectively match the impedance
of a device’s I/O to the characteristic impedance of the transmission line, thereby preventing reflections that adversely affect
signal integrity. However, with the high I/O counts supported by modern devices, adding resistors requires significantly more
components and board area. Furthermore, for some packages—e.g., ball grid arrays—it may not always be possible to
place resistors close to pins.
DCI answers these concerns by providing two kinds of on-chip terminations: Parallel terminations make use of an integrated
resistor network. Series terminations result from controlling the impedance of output drivers. DCI actively adjusts both
parallel and series terminations to accurately match the characteristic impedance of the transmission line. This adjustment
process compensates for differences in I/O impedance that can result from normal variation in the ambient temperature, the
supply voltage and the manufacturing process. When the output driver turns off, the series termination, by definition,
approaches a very high impedance; in contrast, parallel termination resistors remain at the targeted values.
DCI is available only for certain I/O standards, as listed in Table 10. DCI is selected by applying the appropriate I/O standard
extensions to symbols or components. There are five basic ways to configure terminations, as shown in Table 11. The DCI
I/O standard determines which of these terminations is put into effect.
HSTL_I_DCI-, HSTL_III_DCI-, and SSTL2_I_DCI-type outputs do not require the VRN and VRP reference resistors.
Likewise, LVDCI-type inputs do not require the VRN and VRP reference resistors. In a bank without any DCI I/O or a bank
containing non-DCI I/O and purely HSTL_I_DCI- or HSTL_III_DCI-type outputs, or SSTL2_I_DCI-type outputs or
LVDCI-type inputs, the associated VRN and VRP pins can be used as general-purpose I/O pins.
The HSLVDCI (High-Speed LVDCI) standard is intended for bidirectional use. The driver is identical to LVDCI, while the input
is identical to HSTL. By using a VREF-referenced input, HSLVDCI allows greater input sensitivity at the receiver than when
using a single-ended LVCMOS-type receiver.
Table 9: Differential I/O Standards
Signal Standard
(IOSTANDARD)
VCCO (Volts)
VREF for Inputs (Volts)
For Outputs
For Inputs
LDT_25 (ULVDS_25)
2.5
LVDS_25
2.5
BLVDS_25
2.5
LVDSEXT_25
2.5
LVPECL_25
2.5
RSDS_25
2.5
DIFF_HSTL_II_18
1.8
DIFF_SSTL2_II
2.5
Notes:
1.
See Table 10 for a listing of the differential DCI standards.
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