XC3S100E-4CP132C XILINX [Xilinx, Inc], XC3S100E-4CP132C Datasheet - Page 92
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XC3S100E-4CP132C
Manufacturer Part Number
XC3S100E-4CP132C
Description
Spartan-3E FPGA Family
Manufacturer
XILINX [Xilinx, Inc]
Datasheet
1.XC3S100E-4CP132C.pdf
(193 pages)
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Table 56: Slave Serial Mode Connections
Voltage Compatibility
FPGA’s I/O Bank 2, supplied by the VCCO_2 supply input.
The VCCO_2 voltage can be 3.3V, 2.5V, or 1.8V to match
the requirements of the external host, ideally 2.5V. Using
3.3V or 1.8V requires additional design considerations as
the DONE and PROG_B pins are powered by the FPGA’s
2.5V VCCAUX supply. See application note XAPP453: "The
3.3V Configuration of Spartan-3 FPGAs" for additional infor-
mation.
DS312-2 (v1.1) March 21, 2005
Advance Product Specification
HSWAP
M[2:0]
DIN
CCLK
INIT_B
DONE
PROG_B
V
Pin Name
Most Slave Serial interface signals are within the
R
FPGA Direction
bidirectional I/O
bidirectional I/O
Open-drain
Open-drain
Input
Input
Input
Input
Input
User I/O Pull-Up Control. When
Low during configuration, enables
pull-up resistors in all I/O pins to
respective I/O bank
0: Pull-up during configuration
1: No pull-ups
Mode Select. Selects the FPGA
configuration mode.
Data Input.
Configuration Clock. If CCLK
PCB trace is long or has multiple
connections, terminate this output
to maintain signal integrity.
Initialization Indicator. Active
Low. Goes Low at start of
configuration during Initialization
memory clearing process.
Released at end of memory
clearing, when mode select pins
are sampled. In daisy-chain
applications, this signal requires
an external 4.7 kΩ pull-up resistor
to VCCO_2.
FPGA Configuration Done. Low
during configuration. Goes High
when FPGA successfully
completes configuration.
Requires external 330 Ω pull-up
resistor to 2.5V.
Program FPGA. Active Low.
When asserted Low for 300 ns or
longer, forces the FPGA to restart
its configuration process by
clearing configuration memory
and resetting the DONE and
INIT_B pins once PROG_B
returns High. Requires external
4.7 kΩ pull-up resistor to 2.5V. If
driving externally, use an
open-drain or open-collector
driver.
Description
V
CCO
www.xilinx.com
input.
Daisy-Chaining
If the application requires multiple FPGAs with different con-
figurations, then configure the FPGAs using a daisy chain,
as
(M[2:0] = <1:1:1>) for all FPGAs in the daisy-chain. After
the lead FPGA is filled with its configuration data, the lead
FPGA passes configuration data via its DOUT output pin to
the next FPGA on the falling CCLK edge.
Drive at valid logic level
throughout configuration.
M2 = 1, M1 = 1, M0 = 1 Sampled
when INIT_B goes High.
Serial data provided by host.
FPGA captures data on rising
CCLK edge.
External clock.
Active during configuration. If
CRC error detected during
configuration, FPGA drives
INIT_B Low.
Low indicates that the FPGA is
not yet configured.
Must be High to allow
configuration to start.
shown
During Configuration
in
Figure
61.
Use
User I/O
User I/O
User I/O
User I/O
User I/O
Pulled High via external
pull-up. When High,
indicates that the FPGA
successfully configured.
Drive PROG_B Low and
release to reprogram
FPGA.
Functional Description
After Configuration
Slave
Serial
mode
85
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