xa3s100e Xilinx Corp., xa3s100e Datasheet - Page 28

• Manufacturer Part Number: xa3s100e
• Description: Xa Spartan-3e Automotive Fpga Family Data Sheet
• Manufacturer: Xilinx Corp.

Table 32: Switching Characteristics for the PS in Variable Phase Mode
Notes:
1.
2.
3.
Miscellaneous DCM Timing
Table 33: Miscellaneous DCM Timing
DS635 (v1.1) January 20, 2009
Product Specification
Notes:
1.
2.
3.
Phase Shifting Range
MAX_STEPS
FINE_SHIFT_RANGE_MIN
FINE_SHIFT_RANGE_MAX
DCM_RST_PW_MIN
DCM_RST_PW_MAX
DCM_CONFIG_LAG_TIME
The numbers in this table are based on the operating conditions set forth in
The maximum variable phase shift range, MAX_STEPS, is only valid when the DCM is has no initial fixed phase shifting, i.e., the PHASE_SHIFT
attribute is set to 0.
The DCM_DELAY_STEP values are provided at the bottom of
This limit only applies to applications that use the DCM DLL outputs (CLK0, CLK90, CLK180, CLK270, CLK2X, CLK2X180, and CLKDV).
The DCM DFS outputs (CLKFX, CLKFX180) are unaffected.
This specification is equivalent to the Virtex-4 DCM_RESET specification. This specification does not apply for Spartan-3E FPGAs.
This specification is equivalent to the Virtex-4 TCONFIG specification. This specification does not apply for Spartan-3E FPGAs.
Symbol
R
Symbol
(2)
(1)
(2)
(3)
Maximum allowed number of DCM_DELAY_STEP
steps for a given CLKIN clock period, where T = CLKIN
clock period in ns. If using
CLKIN_DIVIDE_BY_2 = TRUE, double the clock
effective clock period.
Minimum guaranteed delay for variable phase shifting
Maximum guaranteed delay for variable phase shifting
Minimum duration of a RST pulse width
Maximum duration of a RST pulse width
Maximum duration from V
configuration successfully completed (DONE pin goes
High) and clocks applied to DCM DLL
Description
Table
www.xilinx.com
Description
28.
CCINT
Table 6
applied to FPGA
and
Table
31.
±[INTEGER(20 • (T
DCM_DELAY_STEP_MAX]
DCM_DELAY_STEP_MIN]
±[MAX_STEPS •
±[MAX_STEPS •
Min
N/A
N/A
N/A
N/A
3
CLKIN
Max
N/A
N/A
N/A
N/A
– 3 ns))]
-
seconds
seconds
minutes
minutes
CLKIN
cycles
Units
Units
steps
ns
ns
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