XC3S250E-4FTG256C Xilinx Inc, XC3S250E-4FTG256C Datasheet - Page 141

• 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

18 x 18 Embedded Multiplier Timing
Table 102: 18 x 18 Embedded Multiplier Timing
DS312-3 (v3.8) August 26, 2009
Product Specification
Notes:
1.
2.
3.
Combinatorial Delay
T
Clock-to-Output Times
T
T
T
Setup Times
T
T
T
Hold Times
T
T
T
Clock Frequency
F
MULT
MSCKP_P
MSCKP_A
MSCKP_B
MSDCK_P
MSDCK_A
MSDCK_B
MSCKD_P
MSCKD_A
MSCKD_B
MULT
Symbol
Combinatorial delay is less and pipelined performance is higher when multiplying input data with less than 18 bits.
The PREG register is typically used in both single-stage and two-stage pipelined multiplier implementations.
Input registers AREG or BREG are typically used when inferring a two-stage multiplier.
R
Combinatorial multiplier propagation delay from the A and B
inputs to the P outputs, assuming 18-bit inputs and a 36-bit
product (AREG, BREG, and PREG registers unused)
Clock-to-output delay from the active transition of the CLK
input to valid data appearing on the P outputs when using
the PREG register
Clock-to-output delay from the active transition of the CLK
input to valid data appearing on the P outputs when using
either the AREG or BREG register
Data setup time at the A or B input before the active
transition at the CLK when using only the PREG output
register (AREG, BREG registers unused)
Data setup time at the A input before the active transition at
the CLK when using the AREG input register
Data setup time at the B input before the active transition at
the CLK when using the BREG input register
Data hold time at the A or B input after the active transition
at the CLK when using only the PREG output register
(AREG, BREG registers unused)
Data hold time at the A input after the active transition at the
CLK when using the AREG input register
Data hold time at the B input after the active transition at the
CLK when using the BREG input register
Internal operating frequency for a two-stage 18x18
multiplier using the AREG and BREG input registers and
the PREG output register
(2)
Description
(1)
(2)
(3)
www.xilinx.com
(3)
(3)
(2)
(3)
(3)
–
3.54
0.20
0.35
0.03
0.04
Min
0.97
0
-
-
-
-5
DC and Switching Characteristics
4.34
Speed Grade
Max
0.98
4.42
270
-
-
-
-
-
-
(1)
–
3.98
0.23
0.39
0.04
0.05
Min
0.97
0
-
-
-
-4
4.88
Max
1.10
4.97
240
-
-
-
-
-
-
(1)
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
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