XC3S250E-4FTG256C Xilinx Inc, XC3S250E-4FTG256C Datasheet - Page 100

• Manufacturer Part Number: XC3S250E-4FTG256C
• Description: IC SPARTAN-3E FPGA 250K 256-FTBG
• Manufacturer: Xilinx Inc
• Series: Spartan™-3Er

Specifications of XC3S250E-4FTG256C

• Total Ram Bits: 221184
• Number Of Logic Elements/cells: 5508
• Number Of Labs/clbs: 612
• Number Of I /o: 172
• Number Of Gates: 250000
• Voltage - Supply: 1.14 V ~ 1.26 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 256-LBGA
• No. Of Logic Blocks: 5508
• No. Of Gates: 250000
• No. Of Macrocells: 5508
• No. Of Speed Grades: 4
• No. Of I/o's: 190
• Clock Management: DLL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 122-1482

Functional Description
Table 66: Slave Serial Mode Connections
100
HSWAP
M[2:0]
DIN
CCLK
INIT_B
DONE
PROG_B
Pin Name
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. See
Considerations for the HSWAP,
M[2:0], and VS[2:0]
Data Input.
Configuration Clock. If CCLK
PCB trace is long or has multiple
connections, terminate this output
to maintain signal integrity. See
CCLK Design
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 500 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. Recommend
external 4.7 kΩ pull-up resistor to
2.5V. Internal pull-up value may
be weaker (see
driving externally with a 3.3V
output, use an open-drain or
open-collector driver or use a
current limiting series resistor.
Description
Considerations.
Table
V
Pins.
CCO
78). If
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Design
input.
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.
During Configuration
DS312-2 (v3.8) August 26, 2009
User I/O
User I/O
User I/O
User I/O
User I/O. If unused in the
application, drive INIT_B
High.
Pulled High via external
pull-up. When High,
indicates that the FPGA
successfully configured.
Drive PROG_B Low and
release to reprogram
FPGA.
After Configuration
Product Specification
R