XC4013E Datasheet, PDF (53/68 Pages) Xilinx, Inc – XC4000E and XC4000X Series Field Programmable Gate Arrays

R
XC4000E and XC4000X Series Field Programmable Gate Arrays
XC4000E/EX/XL Program Readback 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. Internal timing parameters are not measured directly. They are derived from benchmark timing patterns
that are taken at device introduction, prior to any process improvements.
The following guidelines reflect worst-case values over the recommended operating conditions.
Finished
Internal Net
rdbk.TRIG
1 ^TRTRC
rdclk.I
4 TRCL
T_RCRT
2
1 ^TRTRC
T_{RCRT 2}
T_RCH 5
rdbk.RIP
6
T_RCRR
rdbk.DATA
DUMMY DUMMY
T_{RCRD 7}
VALID
VALID
X1790
6
E/EX
Description
Symbol
Min
rdbk.TRIG
rdbk.TRIG setup to initiate and abort Readback 1
T_RTRC
200
rdbk.TRIG hold to initiate and abort Readback 2
T_RCRT
50
rdclk.1
rdbk.DATA delay
7
T_RCRD
-
rdbk.RIP delay
6
T_RCRR
-
High time
Low time
5
T_RCH
250
4
T_RCL
250
Note 1: Timing parameters apply to all speed grades.
Note 2: If rdbk.TRIG is High prior to Finished, Finished will trigger the first Readback.
Max
Units
-
ns
-
ns
250
ns
250
ns
500
ns
500
ns
XL
Description
Symbol
Min
rdbk.TRIG
rdbk.TRIG setup to initiate and abort Readback 1
T_RTRC
200
rdbk.TRIG hold to initiate and abort Readback 2
T_RCRT
50
rdclk.1
rdbk.DATA delay
rdbk.RIP delay
7
T_RCRD
-
6
T_RCRR
-
High time
5
T_RCH
250
Low time
4
T_RCL
250
Note 1: Timing parameters apply to all speed grades.
Note 2: If rdbk.TRIG is High prior to Finished, Finished will trigger the first Readback.
Max
Units
-
ns
-
ns
250
ns
250
ns
500
ns
500
ns
May 14, 1999 (Version 1.6)
6-57