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Figure 9-38, Usb data signal rise and fall timing diagram, Figure 9-39 – AMD Geode SC1201 User Manual

Page 419: Usb source differential data jitter timing diagram

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AMD Geode™ SC1200/SC1201 Processor Data Book

419

Electrical Specifications

32579B

Figure 9-38. USB Data Signal Rise and Fall Timing Diagram

Figure 9-39. USB Source Differential Data Jitter Timing Diagram

Rise Time

Fall Time

t

USB_R1,2

t

USB_F1,2

90%

90%

10%

10%

Differential
Data Lines

C

L

C

L

Full Speed: 4 to 20 ns at C

L

= 50 pF

Low Speed: 75 ns at C

L

= 50 pF, 300 ns at C

L

= 350 pF

t

period_F

Paired Transitions

Consecutive Transitions

Differential

Data Lines

Crossover Points

N*t

period

_

F

+ t

USB_DJ11

N*t

period_F

+ t

USB_DJ12

(1.3-2.0) V

t

USB_DJ12

t

USB_DJ11

t

period_L

t

USB_DJD21

t

USB_DJU21

t

USB_DJD22

t

USB_DJU22

N*t

period_L

+ t

USB_DJD21

N*t

period_L

+ t

USB_DJU21

N*t

period_L

+ t

USB_DJD22

N*t

period_L

+ t

USB_DJU22

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