Xilinx DS610 - Manual (Page 38)

Spartan-3A DSP FPGA Family: DC and Switching Characteristics
DS610 (v3.0) October 4, 2010 www.xilinx.com
Product Specification 38
Configurable Logic Block (CLB) Timing
Table 29: CLB (SLICEM) Timing
Symbol Description
Speed Grade
Units -5 -4
Min Max Min Max
Clock-to-Output Times
T
CKO
When reading from the FFX (FFY) Flip-Flop, the time
from the active transition at the CLK input to data
appearing at the XQ (YQ) output – 0.60 – 0.68 ns
Setup Times
T
AS
Time from the setup of data at the F or G input to the
active transition at the CLK input of the CLB 0.18 – 0.36 – ns
T
DICK
Time from the setup of data at the BX or BY input to
the active transition at the CLK input of the CLB 1.58 – 1.88 – ns
Hold Times
T
AH
Time from the active transition at the CLK input to the
point where data is last held at the F or G input 0.00 – 0.00 – ns
T
CKDI
Time from the active transition at the CLK input to the
point where data is last held at the BX or BY input 0.00 – 0.00 – ns
Clock Timing
T
CH
The High pulse width of the CLB’s CLK signal 0.63 – 0.75 – ns
T
CL
The Low pulse width of the CLK signal 0.63 – 0.75 – ns
F
TOG
Toggle frequency (for export control) 0 770 0 667 MHz
Propagation Times
T
ILO
The time it takes for data to travel from the CLB’s
F (G) input to the X (Y) output – 0.62 – 0.71 ns
Set/Reset Pulse Width
T
RPW_CLB
The minimum allowable pulse width, High or Low, to
the CLB’s SR input 1.33 – 1.61 – ns
Notes:
1. The numbers in this table are based on the operating conditions set forth in Table 7 .