R
XC5200 Series Field Programmable Gate Arrays
XC5200 Global Buffer Switching Characteristic 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
-6
-5
-4
-3
Max
(ns)
Max
(ns)
Max
(ns)
Max
(ns)
Description
Symbol
TBUFG
Device
Global Signal Distribution
From pad through global buffer, to any clock (CK)
XC5202
XC5204
XC5206
XC5210
XC5215
9.1
9.3
8.5
8.7
8.8
8.8
9.9
8.0
8.2
8.3
8.5
9.8
6.9
7.6
7.7
7.7
9.6
9.4
9.4
10.5
XC5200 Longline Switching Characteristic 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
-6
-5
-4
-3
Max
(ns)
Max
(ns)
Max
(ns)
Max
(ns)
Description
Symbol Device
TBUF driving a Longline
TS
TIO
XC5202
XC5204
XC5206
XC5210
XC5215
6.0
6.4
6.6
6.6
7.3
3.8
4.1
4.2
4.2
4.6
3.0
3.2
3.3
3.3
3.8
2.0
2.3
2.7
2.9
3.2
I
O
TBUF
I to Longline, while TS is Low; i.e., buffer is constantly ac-
tive
TS going Low to Longline going from floating High or Low
to active Low or High
TON
XC5202
XC5204
XC5206
XC5210
XC5215
XC52xx
7.8
8.3
8.4
8.4
8.9
3.0
5.6
5.9
6.0
6.0
6.3
2.8
4.7
4.9
5.0
5.0
5.3
2.6
4.0
4.3
4.4
4.4
4.5
2.4
TS going High to TBUF going inactive, not driving
Longline
TOFF
Note: 1. Die-size-dependent parameters are based upon XC5215 characterization. Production specifications will vary with array
size.
7-128
November 5, 1998 (Version 5.2)
ETC [ ETC ]
