xa3s100e Xilinx Corp., xa3s100e Datasheet - Page 23

• Manufacturer Part Number: xa3s100e
• Description: Xa Spartan-3e Automotive Fpga Family Data Sheet
• Manufacturer: Xilinx Corp.

Table 25: 18 x 18 Embedded Multiplier Timing (Continued)
Block RAM Timing
Table 26: Block RAM Timing
DS635 (v1.1) January 20, 2009
Product Specification
Notes:
1.
2.
3.
4.
Clock Frequency
F
Clock-to-Output Times
T
Setup Times
T
T
T
T
Hold Times
T
T
T
T
MULT
BCKO
BACK
BDCK
BECK
BWCK
BCKA
BCKD
BCKE
BCKW
Symbol
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.
The PREG register is typically used when inferring a single-stage multiplier.
Input registers AREG or BREG are typically used when inferring a two-stage multiplier.
R
When reading from block RAM, the delay from the active transition
at the CLK input to data appearing at the DOUT output
Setup time for the ADDR inputs before the active transition at the
CLK input of the block RAM
Setup time for data at the DIN inputs before the active transition at
the CLK input of the block RAM
Setup time for the EN input before the active transition at the CLK
input of the block RAM
Setup time for the WE input before the active transition at the CLK
input of the block RAM
Hold time on the ADDR inputs after the active transition at the CLK
input
Hold time on the DIN inputs after the active transition at the CLK
input
Hold time on the EN input after the active transition at the CLK input
Hold time on the WE input after the active transition at the CLK input
Internal operating frequency for a two-stage 18x18 multiplier using the
AREG and BREG input registers and the PREG output register
Description
Description
www.xilinx.com
(1)
0.38
0.23
0.77
1.26
0.14
0.13
Min
-4 Speed Grade
0
0
-
-4 Speed Grade
Min
0
Max
2.82
-
-
-
-
-
-
-
-
Max
240
Units
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
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