R
XC3000 Series Field Programmable Gate Arrays
XC3100A CLB Switching Characteristics Guidelines
Testing of the switching parameters is modeled after testing methods specified by MIL-M-38510/605. All devices are 100%
functionally tested. Since many internal timing parameters cannot be measured directly, they are derived from benchmark
timing patterns. The following guidelines reflect worst-case values over the recommended operating conditions. For more
detailed, more precise, and more up-to-date timing information, use the values provided by the timing calculator and used
in the simulator.
Speed Grade
Symbol
-4
-3
-2
-1
-09
Description
Combinatorial Delay
Min Max Min Max Min Max Min Max Min Max Units
Logic Variables
to outputs X or Y
A, B, C, D, E,
1
8
TILO
3.3
2.7
2.2
1.75
1.5
ns
Sequential delay
Clock k to outputs X or Y
Clock k to outputs X or Y when Q is returned
through function generators F or G to drive
X or Y
TCKO
2.5
5.2
2.1
4.3
1.7
3.5
1.4
3.1
1.25
2.7
ns
ns
TQLO
TICK
TDICK 1.6
TECCK 3.2
1.0
Set-up time before clock K
Logic Variables
Data In
Enable Clock
Reset Direct inactive RD
A, B, C, D, E
DI
EC
2
4
6
2.5
2.1
1.4
2.7
1.0
1.8
1.3
2.5
1.0
1.7
1.2
2.3
1.0
1.5
1.0
2.05
1.0
ns
ns
ns
ns
Hold Time after clock K
Logic Variables
Data In
Enable Clock
A, B, C, D, E
DI
EC
3
5
7
TCKI
TCKDI 1.0
TCKEC 0.8
0
0
0.9
0.7
0
0.9
0.7
0
0.8
0.6
0
0.7
0.55
ns
ns
ns
Clock
Clock High time
Clock Low time
Max. flip-flop toggle rate
11 TCH
12 TCL
FCLK
2.0
2.0
227
1.6
1.6
270
1.3
1.3
323
1.3
1.3
323
1.3
1.3
370
ns
ns
MHz
7
Reset Direct (RD)
RD width
delay from RD to outputs X or Y
Global Reset (RESET Pad)1
RESET width (Low)
13 TRPW 3.2
2.7
2.3
2.3
2.05
12.0
ns
ns
9
TRIO
3.7
3.1
2.7
2.4
2.15
12.0
(XC3142A)
TMRW 14.0
TMRQ
12.0
12.0
12.0
ns
ns
delay from RESET pad to outputs X or Y
14.0
12.0
12.0
12.0
Prelim
Notes: 1. The CLB K to Q output delay (TCKO, #8) of any CLB, plus the shortest possible interconnect delay, is always longer than the
Data In hold time requirement (TCKDI, #5) of any CLB on the same die.
2. TILO, TQLO and TICK are specified for 4-input functions. For 5-input functions or base FGM functions, each of these
specifications for the XC3100A family increases by 0.50 ns (-5), 0.42 ns (-4) and 0.35 ns (-3), 0.35 ns (-2), 0.30 ns (-1), and
0.30 ns (-09).
November 9, 1998 (Version 3.1)
7-55
XILINX [ XILINX, INC ]
