XCS20-3PQ208I Xilinx Inc, XCS20-3PQ208I Datasheet - Page 37

• Manufacturer Part Number: XCS20-3PQ208I
• Description: IC FPGA 5V I-TEMP 208-PQFP
• Manufacturer: Xilinx Inc
• Series: Spartan™r

Specifications of XCS20-3PQ208I

• Number Of Logic Elements/cells: 950
• Number Of Labs/clbs: 400
• Total Ram Bits: 12800
• Number Of I /o: 160
• Number Of Gates: 20000
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 208-BFQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Configuration Through the Boundary Scan
Pins
Spartan/XL devices can be configured through the bound-
ary scan pins. The basic procedure is as follows:
•
•
DS060 (v1.8) June 26, 2008
Product Specification
Power up the FPGA with INIT held Low (or drive the
PROGRAM pin Low for more than 300 ns followed by a
High while holding INIT Low). Holding INIT Low allows
enough time to issue the CONFIG command to the
FPGA. The pin can be used as I/O after configuration if
a resistor is used to hold INIT Low.
Issue the CONFIG command to the TMS input.
R
CCLK_NOSYNC
UCLK_NOSYNC
CCLK_SYNC
UCLK_SYNC
CCLK
Synchronization
Uncertainty
DONE
I/O
DONE
I/O
DONE
I/O
DONE
I/O
GSR Active
GSR Active
GSR Active
GSR Active
Length Count Match
C1, C2 or C3
DONE IN
C1
C1
C1
Di
Figure 31: Start-up Timing
Di
DONE IN
Di+1
Di+1
C2
C2
C2
www.xilinx.com
U2
U2
U2
U2
Di
UCLK Period
Di
Di+1
Di+1
•
•
•
The user must account for all TCK clock cycles after INIT
goes High, as all of these cycles affect the Length Count
compare.
For more detailed information, refer to the Xilinx application
note, "Boundary Scan in FPGA Devices." This application
note applies to Spartan and Spartan-XL devices.
U3
U3
U3
C3
C3
C3
Wait for INIT to go High.
Sequence the boundary scan Test Access Port to the
SHIFT-DR state.
Toggle TCK to clock data into TDI pin.
Spartan and Spartan-XL FPGA Families Data Sheet
CCLK Period
Di+2
Di+2
U4
U4
U4
F
F
F
C4
C4
C4
F
F = Finished, no more
configuration clocks needed
Daisy-chain lead device
must have latest F
Heavy lines describe
default timing
DS060_39_082801
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