XC2VP20-6FF1152C Xilinx, Inc., XC2VP20-6FF1152C Datasheet - Page 24
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XC2VP20-6FF1152C
Manufacturer Part Number
XC2VP20-6FF1152C
Description
Pro Platform FPGA
Manufacturer
Xilinx, Inc.
Datasheet
1.XC2VP20-6FF1152C.pdf
(268 pages)
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Functional Description: FPGA
This DDR mechanism can be used to mirror a copy of the
clock on the output. This is useful for propagating a clock
along the data that has an identical delay. It is also useful for
Each group of two registers has a clock enable signal (ICE
for the input registers, OCE for the output registers, and
TCE for the 3-state registers). The clock enable signals are
active High by default. If left unconnected, the clock enable
for that storage element defaults to the active state.
Each IOB block has common synchronous or asynchronous
set and reset (SR and REV signals).
SR forces the storage element into the state specified by the
SRHIGH or SRLOW attribute. SRHIGH forces a logic 1.
SRLOW forces a logic “0”. When SR is used, a second input
(REV) forces the storage element into the opposite state. The
reset condition predominates over the set condition. The ini-
tial state after configuration or global initialization state is
defined by a separate INIT0 and INIT1 attribute. By default,
the SRLOW attribute forces INIT0, and the SRHIGH attribute
forces INIT1.
24
DCM
0
D1
D2
CLK1
CLK2
Q1
Q2
Figure 11: Double Data Rate Registers
DDR MUX
FDDR
www.xilinx.com
1-800-255-7778
Q
multiple clock generation, where there is a unique clock
driver for every clock load. Virtex-II Pro devices can pro-
duce many copies of a clock with very little skew.
For each storage element, the SRHIGH, SRLOW, INIT0,
and INIT1 attributes are independent. Synchronous or
asynchronous set / reset is consistent in an IOB block.
All the control signals have independent polarity. Any
inverter placed on a control input is automatically absorbed.
Each register or latch, independent of all other registers or
latches, can be configured as follows:
•
•
•
•
•
•
•
The synchronous reset overrides a set, and an asynchro-
nous clear overrides a preset.
Refer to
180 0
DCM
No set or reset
Synchronous set
Synchronous reset
Synchronous set and reset
Asynchronous set (preset)
Asynchronous reset (clear)
Asynchronous set and reset (preset and clear)
Figure
12.
D1
D2
CLK1
CLK2
Q1
Q2
DS083-2 (v1.0) January 31, 2002
Advance Product Specification
DDR MUX
FDDR
DS083-2_26_122001
Q
R
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