參數(shù)資料
型號(hào)： XC2S150-5FG456I
廠商： Xilinx Inc
文件頁(yè)數(shù)： 33/99頁(yè)
文件大?。?/td> 0K
描述： IC FPGA 2.5V I-TEMP 456-FBGA
標(biāo)準(zhǔn)包裝： 60
系列： Spartan®-II
LAB/CLB數(shù)： 864
邏輯元件/單元數(shù)： 3888
RAM 位總計(jì)： 49152
輸入/輸出數(shù)： 260
門(mén)數(shù)： 150000
電源電壓： 2.375 V ~ 2.625 V
安裝類(lèi)型： 表面貼裝
工作溫度： -40°C ~ 100°C
封裝/外殼： 456-BBGA
供應(yīng)商設(shè)備封裝： 456-FBGA
Spartan-II FPGA Family: Functional Description
DS001-2 (v2.8) June 13, 2008
Module 2 of 4
Product Specification
39
R
the LOC property is described below. Table 16 summarizes
the input standards compatibility requirements.
An optional delay element is associated with each IBUF.
When the IBUF drives a flip-flop within the IOB, the delay
element by default activates to ensure a zero hold-time
requirement. The NODELAY=TRUE property overrides this
default.
When the IBUF does not drive a flip-flop within the IOB, the
delay element de-activates by default to provide higher
performance. To delay the input signal, activate the delay
element with the DELAY=TRUE property.
IBUFG
Signals used as high fanout clock inputs to the
Spartan-II device should drive a global clock input buffer
(IBUFG) via an external input port in order to take
advantage of one of the four dedicated global clock
distribution networks. The output of the IBUFG primitive can
only drive a CLKDLL, CLKDLLHF, or a BUFG primitive. The
generic IBUFG primitive appears in Figure 37.
With no extension or property specified for the generic
IBUFG primitive, the assumed standard is LVTTL.
The voltage reference signal is "banked" within the
Spartan-II device on a half-edge basis such that for all
packages there are eight independent VREF banks
internally. See Figure 36 for a representation of the I/O
banks. Within each bank approximately one of every six I/O
pins is automatically configured as a VREF input.
IBUFG placement restrictions require any differential
amplifier input signals within a bank be of the same
standard. The LOC property can specify a location for the
IBUFG.
As an added convenience, the BUFGP can be used to
instantiate a high fanout clock input. The BUFGP primitive
represents a combination of the LVTTL IBUFG and BUFG
primitives, such that the output of the BUFGP can connect
directly to the clock pins throughout the design.
The Spartan-II FPGA BUFGP primitive can only be placed
in a global clock pad location. The LOC property can specify
a location for the BUFGP.
OBUF
An OBUF must drive outputs through an external output
port. The generic output buffer (OBUF) primitive appears in
With no extension or property specified for the generic
OBUF primitive, the assumed standard is slew rate limited
LVTTL with 12 mA drive strength.
The LVTTL OBUF additionally can support one of two slew
rate modes to minimize bus transients. By default, the slew
rate for each output buffer is reduced to minimize power bus
transients when switching non-critical signals.
Figure 36: I/O Banks
Table 16: Xilinx Input Standards Compatibility
Requirements
Rule 1
All differential amplifier input signals within a
bank are required to be of the same standard.
Rule 2
There are no placement restrictions for inputs
with standards that require a single-ended input
buffer.
DS001_03_060100
Bank 0
GCLK3
GCLK2
GCLK1
GCLK0
Bank 1
Bank 5
Bank 4
Spartan-II
Device
Bank
7
Bank
6
Bank
2
Bank
3
Figure 37: Global Clock Input Buffer (IBUFG) Primitive
Figure 38: Output Buffer (OBUF) Primitive
O
I
IBUFG
DS001_37_061200
O
I
OBUF
DS001_38_061200
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