參數(shù)資料
型號： XCS05XL-3PC280I
廠商： Xilinx, Inc.
英文描述： Spartan and Spartan-XL Families Field Programmable Gate Arrays
中文描述： 斯巴達(dá)和Spartan - xL的家庭現(xiàn)場可編程門陣列
文件頁數(shù)： 8/66頁
文件大?。?/td> 809K
代理商： XCS05XL-3PC280I
R
Spartan and Spartan-XL Families Field Programmable Gate Arrays
4-8
DS060 (v1.5) March 2, 2000
When configured as a multiplexer, this feature allows two
output signals to time-share the same output pad, effec-
tively doubling the number of device outputs without requir-
ing a larger, more expensive package. The select input is
the pin used for the output flip-flop clock, OK.
When the multiplexer is configured as a 2-input function
generator, logic can be implemented within the IOB itself.
Combined with a Global buffer, this arrangement allows
very high-speed gating of a single signal. For example, a
wide decoder can be implemented in CLBs, and its output
gated with a Read or Write Strobe driven by a global buffer.
The user can specify that the IOB function generator be
used by placing special library symbols beginning with the
letter "O." For example, a 2-input AND gate in the IOB func-
tion generator is called OAND2. Use the symbol input pin
labeled "F" for the signal on the critical path. This signal is
placed on the OK pin
—
the IOB input with the shortest
delay to the function generator. Two examples are shown in
Figure 7
.
Output Buffer
An active High 3-state signal can be used to place the out-
put buffer in a high-impedance state, implementing 3-state
outputs or bidirectional I/O. Under configuration control, the
output (O) and output 3-state (T) signals can be inverted.
The polarity of these signals is independently configured for
each IOB (see
Figure 5 on page 6
). An output can be con-
figured as open-drain (open-collector) by tying the 3-state
pin (T) to the output signal, and the input pin (I) to Ground.
By default, a 5V Spartan device output buffer pull-up struc-
ture is configured as a TTL-like totem-pole. The High driver
is an n-channel pull-up transistor, pulling to a voltage one
transistor threshold below V
CC
. Alternatively, the outputs
can be globally configured as CMOS drivers, with addi-
tional p-channel pull-up transistors pulling to V
CC
. This
option, applied using the bitstream generation software,
applies to all outputs on the device. It is not individually pro-
grammable.
All Spartan-XL device outputs are configured as CMOS
drivers, therefore driving rail-to-rail. The Spartan-XL out-
puts are individually programmable for 12 mA or 24 mA out-
put drive.
Any 5V Spartan device with its outputs configured in TTL
mode can drive the inputs of any typical 3.3V device. Sup-
ported destinations for Spartan/XL device outputs are
shown in
Table 7
.
Three-State Register (Spartan-XL Only)
Spartan-XL devices incorporate an optional register con-
trolling the three-state enable in the IOBs. The use of the
three-state control register can significantly improve output
enable and disable time.
Output Slew Rate
The slew rate of each output buffer is, by default, reduced,
to minimize power bus transients when switching non-criti-
cal signals. For critical signals, attach a FAST attribute or
property to the output buffer or flip-flop.
Spartan/XL devices have a feature called "Soft Start-up,"
designed to reduce ground bounce when all outputs are
turned on simultaneously at the end of configuration.
When the configuration process is finished and the device
starts up, the first activation of the outputs is automatically
slew-rate limited. Immediately following the initial activation
of the I/O, the slew rate of the individual outputs is deter-
mined by the individual configuration option for each IOB.
Pull-up and Pull-down Network
Programmable pull-up and pull-down resistors are used for
tying unused pins to V
CC
or Ground to minimize power con-
sumption and reduce noise sensitivity. The configurable
pull-up resistor is a p-channel transistor that pulls to V
CC
.
The configurable pull-down resistor is an n-channel transis-
tor that pulls to Ground. The value of these resistors is typ-
ically 20 k
100 k
(
See
“
Spartan DC Characteristics
Over Operating Conditions
”
on page 36.
). This high value
makes them unsuitable as wired-AND pull-up resistors.
OAND2
F
X6598
D0
S0
D1
O
OMUX2
X6599
Figure 7: AND & MUX Symbols in Spartan-XL IOB
Table 7: Supported Destinations for Spartan/XL
Outputs
Destination
Spartan-XL
Outputs
3.3V,
CMOS
√
Spartan
Outputs
5V,
TTL
√
5V,
CMOS
Some
1
Any device, V
CC
= 3.3V,
CMOS-threshold inputs
Any device, V
CC
= 5V,
TTL-threshold inputs
Any device, V
CC
= 5V,
CMOS-threshold inputs
1.
Only if destination device has 5V tolerant inputs
√
√
√
Unreliable
Data
√
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