Spartan-3AN FPGA Family: DC and Switching Characteristics
DS557 (v4.1) April 1, 2011
Product Specification
59
Suspend Mode Timing
X-Ref Target - Figure 12
Figure 12: Suspend Mode Timing
Table 49: Suspend Mode Timing Parameters
Symbol
Description
Min
Typ
Max
Units
Entering Suspend Mode
TSUSPENDHIGH_AWAKE Rising edge of SUSPEND pin to falling edge of AWAKE pin without glitch filter
(suspend_filter:No)
–7
–ns
TSUSPENDFILTER
Adjustment to SUSPEND pin rising edge parameters when glitch filter enabled
(suspend_filter:Yes)
+160
+300
+600
ns
TSUSPEND_GTS
Rising edge of SUSPEND pin until FPGA output pins drive their defined
SUSPEND constraint behavior
–10
–ns
TSUSPEND_GWE
Rising edge of SUSPEND pin to write-protect lock on all writable clocked
elements
–< 5
–ns
TSUSPEND_DISABLE
Rising edge of the SUSPEND pin to FPGA input pins and interconnect
disabled
–
340
–ns
Exiting Suspend Mode
TSUSPENDLOW_AWAKE Falling edge of the SUSPEND pin to rising edge of the AWAKE pin
Does not include DCM lock time
–
4 to 108
–s
TSUSPEND_ENABLE
Falling edge of the SUSPEND pin to FPGA input pins and interconnect
re-enabled
–
3.7 to 109
–s
TAWAKE_GWE1
Rising edge of the AWAKE pin until write-protect lock released on all writable
clocked elements, using sw_clk:InternalClock and sw_gwe_cycle:1
–67
–ns
TAWAKE_GWE512
Rising edge of the AWAKE pin until write-protect lock released on all writable
clocked elements, using sw_clk:InternalClock and sw_gwe_cycle:512
–14
–s
TAWAKE_GTS1
Rising edge of the AWAKE pin until outputs return to the behavior described
in the FPGA application, using sw_clk:InternalClock and sw_gts_cycle:1
–57
–ns
TAWAKE_GTS512
Rising edge of the AWAKE pin until outputs return to the behavior described
in the FPGA application, using sw_clk:InternalClock and sw_gts_cycle:512
–14
–s
Notes:
1.
These parameters based on characterization.
2.
For information on using the Spartan-3AN Suspend feature, see
XAPP480: Using Suspend Mode in Spartan-3 Generation FPGAs.
DS610-3_08_061207
Blocked
t
SUSPEND_DISABLE
t
SUSPEND_GWE
t
SUSPENDHIGH_AWAKE
t
AWAKE_GWE
t
AWAKE_GTS
t
SUSPEND_GTS
SUSPEND Input
AWAKE Output
Flip-Flops, Block RAM,
Distributed RAM
FPGA Outputs
FPGA Inputs,
Interconnect
Write Protected
Defined by SUSPEND constraint
Entering Suspend Mode
Exiting Suspend Mode
sw_gts_cycle
sw_gwe_cycle
t
SUSPEND_ENABLE
t
SUSPENDLOW_AWAKE