參數(shù)資料
型號: XA3S250E-4FT256I
廠商: Xilinx Inc
文件頁數(shù): 21/37頁
文件大小: 0K
描述: IC FPGA SPARTAN-3E 256FPBGA
標(biāo)準(zhǔn)包裝: 90
系列: Spartan®-3E XA
LAB/CLB數(shù): 612
邏輯元件/單元數(shù): 5508
RAM 位總計: 221184
輸入/輸出數(shù): 172
門數(shù): 250000
電源電壓: 1.14 V ~ 1.26 V
安裝類型: 表面貼裝
工作溫度: -40°C ~ 100°C
封裝/外殼: 256-LBGA
供應(yīng)商設(shè)備封裝: 256-FTBGA
DS635 (v2.0) September 9, 2009
Product Specification
28
R
Miscellaneous DCM Timing
Table 31: Switching Characteristics for the PS in Variable Phase Mode
Symbol
Description
Units
Phase Shifting Range
MAX_STEPS(2)
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.
CLKIN < 60 MHz
±[INTEGER(10
(TCLKIN – 3 ns))]
steps
CLKIN > 60 MHz
±[INTEGER(15
(TCLKIN – 3 ns))]
steps
FINE_SHIFT_RANGE_MIN
Minimum guaranteed delay for variable phase shifting
±[MAX_STEPS
DCM_DELAY_STEP_MIN]
ns
FINE_SHIFT_RANGE_MAX
Maximum guaranteed delay for variable phase shifting
±[MAX_STEPS
DCM_DELAY_STEP_MAX]
ns
Notes:
1.
The numbers in this table are based on the operating conditions set forth in Table 6 and Table 30.
2.
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.
3.
The DCM_DELAY_STEP values are provided at the bottom of Table 27.
Table 32: Miscellaneous DCM Timing
Symbol
Description
Min
Max
Units
DCM_RST_PW_MIN(1)
Minimum duration of a RST pulse width
3
-CLKIN
cycles
DCM_RST_PW_MAX(2)
Maximum duration of a RST pulse width
N/A
seconds
N/A
seconds
DCM_CONFIG_LAG_TIME(3)
Maximum duration from VCCINT applied to FPGA
configuration successfully completed (DONE pin goes
High) and clocks applied to DCM DLL
N/A
minutes
N/A
minutes
Notes:
1.
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.
2.
This specification is equivalent to the Virtex-4 DCM_RESET specification. This specification does not apply for Spartan-3E FPGAs.
3.
This specification is equivalent to the Virtex-4 TCONFIG specification. This specification does not apply for Spartan-3E FPGAs.
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