參數(shù)資料
型號: MSC8122TVT6400
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 數(shù)字信號處理
英文描述: 32-BIT, 400 MHz, OTHER DSP, PBGA431
封裝: LEAD FREE, FCBGA-431
文件頁數(shù): 19/48頁
文件大?。?/td> 1158K
代理商: MSC8122TVT6400
MSC8122 Quad Digital Signal Processor Data Sheet, Rev. 16
Electrical Characteristics
Freescale Semiconductor
26
2.5.5.2
CLKIN to CLKOUT Skew
Table 17 describes the CLKOUT-to-CLKIN skew timing.
For designs that use the CLKOUT synchronization mode, use the skew values listed in Table 16 to adjust the rise-to-fall timing
values specified for CLKIN synchronization. Figure 12 shows the relationship between the CLKOUT and CLKIN timings.
Table 16. CLKOUT Skew
No.
Characteristic
Min1
Max1
Units
20
Rise-to-rise skew
VDD = 1.1 V
VDD = 1.2 V
0.0
0.95
0.85
ns
21
Fall-to-fall skew
VDD = 1.1 V
VDD = 1.2 V
–1.5
–0.8
1.0
ns
22
CLKOUT phase (1.2 V, 133 MHz)
Phase high
Phase low
2.8
ns
23
CLKOUT phase (1.1 V, 133 MHz)
Phase high
Phase low
2.2
ns
24
CLKOUT phase (1.1 V, 100 MHz)
Phase high
Phase low
3.3
ns
Notes:
1.
A positive number indicates that CLKOUT precedes CLKIN, A negative number indicates that CLKOUT follows CLKIN.
2.
Skews are measured in clock mode 29, with a CLKIN:CLKOUT ratio of 1:1. The same skew is valid for all clock modes.
3.
CLKOUT skews are measured using a load of 10 pF.
4.
CLKOUT skews and phase are not measured for 500/166 Mhz parts because these parts only use CLKIN mode.
Figure 12. CLKOUT and CLKIN Signals.
CLKIN
CLKOUT
20
21
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