xc4025 Xilinx Corp., xc4025 Datasheet - Page 8

• Manufacturer Part Number: xc4025
• Description: Logic Cell Array Family , Inc
• Manufacturer: Xilinx Corp.

XC4000 Logic Cell Array Family
CLB Switching Characteristic Guidelines (continued)
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 XACT timing calculator and used in the simulator.
Note: Timing for the 16 x 1 RAM option is identical to 16 x 2 RAM timing
CLB RAM Option
Description
Write Operation
Read Operation
Read Operation, Clocking Data into Flip-Flop
Read During Write
Read During Write, Clocking Data into Flip-Flop
Address write cycle time
Write Enable pulse width (High)
Address set-up time before beginning of WE
Address hold time after end of WE
DIN set-up time before end of WE
DIN hold time after end of WE
Address read cycle time
Data valid after address change
(no Write Enable)
Address setup time before clock K
Data valid after WE going active
(DIN stable before WE)
Data valid after DIN
(DIN change during WE)
WE setup time before clock K
Data setup time before clock K
16 x 2
16 x 2
32 x 1
16 x 2
32 x 1
16 x 2
32 x 1
16 x 2
32 x 1
16 x 2
32 x 1
both
16 x 2
32 x 1
16 x 2
32 x 1
16 x 2
32 x 1
16 x 2
32 x 1
16 x 2
32 x 1
32 x 1
16 x 2
32 x 1
2-54
Speed Grade
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WC
WCT
WP
WPT
AS
AST
AH
AHT
DS
DST
DHT
RC
RCT
ILO
IHO
ICK
IHCK
WO
WOT
DO
DOT
WCK
WCKT
DCK
DCKT
10.0
12.0
15.0
11.0
14.0
Min
9.0
9.0
5.0
5.0
2.0
2.0
2.0
2.0
4.0
5.0
2.0
7.0
6.0
8.0
-6
Max
12.0
15.0
11.0
14.0
6.0
8.0
10.0
12.0
11.0
Min Max
8.0
8.0
4.0
4.0
2.0
2.0
2.0
2.0
4.0
5.0
2.0
5.5
7.5
4.5
6.0
9.0
-5
10.0
12.0
11.0
4.5
7.0
9.0
11.5
11.0
Min Max Units
8.0
8.0
4.0
4.0
2.0
2.0
2.0
2.0
4.0
5.0
2.0
5.0
7.0
4.5
6.0
9.5
9.0
-4
11.0
11.0
4.0
6.0
9.0
8.5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns