XC3S200-4TQ144C Xilinx Inc, XC3S200-4TQ144C Datasheet - Page 42
XC3S200-4TQ144C
Manufacturer Part Number
XC3S200-4TQ144C
Description
FPGA Spartan®-3 Family 200K Gates 4320 Cells 630MHz 90nm Technology 1.2V 144-Pin TQFP
Manufacturer
Xilinx Inc
Datasheet
1.XC3S50-4VQG100C.pdf
(217 pages)
Specifications of XC3S200-4TQ144C
Package
144TQFP
Family Name
Spartan®-3
Device Logic Units
4320
Device System Gates
200000
Maximum Internal Frequency
630 MHz
Typical Operating Supply Voltage
1.2 V
Maximum Number Of User I/os
97
Ram Bits
221184
Case
TQFP
Dc
05+
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Spartan-3 FPGA Family: Functional Description
Table 24: BUFGMUX Select Mechanism
The two clock inputs can be asynchronous with regard to
each other, and the S input can change at any time, except
for a short setup time prior to the rising edge of the presently
selected clock (I0 or I1). Violating this setup time require-
ment can result in an undefined runt pulse output.
The BUFG clock buffer primitive drives a single clock signal
onto the clock network and is essentially the same element
as a BUFGMUX, just without the clock select mechanism.
Similarly, the BUFGCE primitive creates an enabled clock
buffer using the BUFGMUX select mechanism.
Each BUFGMUX buffers incoming clock signals to two pos-
sible destinations:
1. The vertical spine belonging to the same side of the die
42
54
— top or bottom — as the BUFGMUX element in use.
The two spines — top and bottom — each comprise
four vertical clock lines, each running from one of the
BUFGMUX elements on the same side towards the
center of the die. At the center of the die, clock signals
S Input
0
1
O Output
I0 Input
I1 Input
www.xilinx.com
2. The clock input of either DCM on the same side of the
Use either a BUFGMUX element or a BUFG (Global Clock
Buffer) element to place a Global input in the design. For the
purpose of minimizing the dynamic power dissipation of the
clock network, the Xilinx development software automati-
cally disables all clock line segments that a design does not
use.
A global clock line ideally drives clock inputs on the various
clocked elements within the FPGA, such as CLB or IOB
flip-flops or block RAMs. A global clock line also optionally
drives combinatorial inputs. However, doing so provides
additional loading on the clock line that might also affect
clock jitter. Ideally, drive combinatorial inputs using the sig-
nal that also drives the input to the BUFGMUX or BUFG ele-
ment.
For more details, refer to the “Using Global Clock
Resources” chapter in UG331.
reach the eight-line horizontal spine, which spans the
width of the die. In turn, the horizontal spine branches
out into a subsidiary clock interconnect that accesses
the CLBs.
die — top or bottom — as the BUFGMUX element in
use.
DS099-2 (v2.5) December 4, 2009
Product Specification
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