R
Spartan and Spartan-XL Families Field Programmable Gate Arrays
Spartan CLB RAM Synchronous (Edge-Triggered) Write Operation Guidelines
Testing of switching parameters is modeled after testing
methods specified by MIL-M-38510/605. All devices are
100% functionally tested. Internal timing parameters are
derived from measuring internal test patterns. Listed below
are representative values. For more specific, more precise,
and worst-case guaranteed data, use the values reported
by the static timing analyzer (TRCE in the Xilinx Develop-
ment System) and back-annotated to the simulation netlist.
All timing parameters assume worst-case operating condi-
tions (supply voltage and junction temperature). Values
apply to all Spartan devices and are expressed in nanosec-
onds unless otherwise noted.
Speed Grade
-4
-3
(1)
Symbol
Single Port RAM
Size
Min
Max
Min
Max
Units
Write Operation
T
Address write cycle time (clock K period)
Clock K pulse width (active edge)
Address setup time before clock K
Address hold time after clock K
DIN setup time before clock K
DIN hold time after clock K
16x2
32x1
16x2
32x1
16x2
32x1
16x2
32x1
16x2
32x1
16x2
32x1
16x2
32x1
16x2
32x1
16x2
32x1
8.0
8.0
4.0
4.0
1.5
1.5
0.0
0.0
1.5
1.5
0.0
0.0
1.5
1.5
0.0
0.0
-
-
11.6
11.6
5.8
5.8
2.0
2.0
0.0
0.0
2.7
1.7
0.0
0.0
1.6
1.6
0.0
0.0
-
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
WCS
T
-
-
WCTS
T
-
-
WPS
T
-
-
WPTS
T
-
-
ASS
T
-
-
ASTS
T
-
-
AHS
T
-
-
AHTS
T
-
-
DSS
T
-
-
DSTS
T
-
-
DHS
T
-
-
DHTS
T
WE setup time before clock K
WE hold time after clock K
-
-
-
-
WSS
T
T
T
WSTS
T
-
-
WHS
-
-
WHTS
T
Data valid after clock K
6.5
7.0
7.9
9.3
WOS
-
-
WOTS
Read Operation
T
Address read cycle time
16x2
32x1
16x2
32x1
16x2
32x1
2.6
3.8
-
-
-
2.6
3.8
-
-
-
ns
ns
ns
ns
ns
ns
RC
T
RCT
T
Data valid after address change (no Write
Enable)
1.2
2.0
-
1.6
2.7
-
ILO
IHO
T
-
-
T
Address setup time before clock K
1.8
2.9
2.4
3.9
ICK
T
-
-
IHCK
Notes:
1. Timing for 16 x 1 RAM option is identical to 16 x 2 RAM timing.
DS060 (v1.6) September 19, 2001
Product Specification
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