Electrical Specifications

32579B

9.3.10Universal Serial Bus (USB)

Table 9-31. USB Timing Parameters

Symbol

Parameter

Min

Max

Unit

Figure

Comments

 

 

 

 

 

 

 

Full Speed Source (Note 1, Note 2)

 

 

 

 

 

 

 

 

 

 

 

 

tUSB_R1

DPOS_Port1,2,3, DNEG_Port1,2,3

4

20

ns

9-38

(Monotonic) from 10% to

 

Driver Rise Time

 

 

 

 

90% of the D_Port lines

 

 

 

 

 

 

 

tUSB_F1

DPOS_Port1,2,3, DNEG_Port1,2,3

4

20

ns

9-38

(Monotonic) from 90% to

 

Driver Fall Time

 

 

 

 

10% of the D_Port lines

 

 

 

 

 

 

 

tUSB_FRFM

Rise/Fall time matching

90

110

%

 

 

tUSB_FSDR

Full-speed data rate

11.97

12.03

Mbps

 

Average bit rate 12 Mbps

 

 

 

 

 

 

± 0.25%

 

 

 

 

 

 

 

tUSB_FSF

Full-speed frame interval

0.9995

1.0005

ms

 

1.0 ms ± 0.05%

tperiod_F

Full-speed period between data bits

83.1

83.5

ns

 

Average bit rate 12 Mbps

tUSB DOR

Driver-output resistance

28

43

W

 

Steady-state drive

tUSB_DJ11

Source differential driver jitter for con-

–3.5

3.5

ns

9-39

Note 3, Note 4

 

secutive transition

 

 

 

 

 

 

 

 

 

 

 

 

tUSB_DJ12

Source differential driver jitter for paired

–4.0

4.0

ns

9-39

Note 3, Note 4

 

transitions

 

 

 

 

 

 

 

 

 

 

 

 

tUSB_SE1

Source EOP width

160

175

ns

9-39

Note 4, Note 5

tUSB_DE1

Differential to EOP transition skew

–2

5

ns

9-40

Note 4, Note 5

tUSB_RJ11

Receiver data jitter tolerance for con-

–18.5

18.5

ns

9-41

Note 4

 

secutive transition

 

 

 

 

 

 

 

 

 

 

 

 

tUSB_RJ12

Receiver data jitter tolerance for paired

–9

9

ns

9-41

Note 4

 

transitions

 

 

 

 

 

 

 

 

 

 

 

 

Full Speed Receiver EOP Width (Note 4)

 

 

 

 

 

 

 

 

 

 

 

 

tUSB_RE11

Must reject as EOP

 

40

ns

9-40

Note 5

tUSB_RE12

Must accept as EOP

82

 

ns

9-40

Note 5

Low Speed Source (Note 1)

 

 

 

 

 

 

 

 

 

 

 

 

tUSB_R2

DPOS_Port1,2,3, DNEG_Port1,2,3

75

300

ns

9-38

(Monotonic) from 10% to

 

Driver Rise Time

 

(Note 6)

 

 

90% of the D_Port lines

 

 

 

 

 

 

 

tUSB_F2

DPOS_Port1,2,3, DNEG_Port1,2,3

75

300

ns

9-38

(Monotonic) from 90% to

 

Driver Fall Time

 

(Note 6)

 

 

10% of the D_Port lines

 

 

 

 

 

 

 

tUSB_LRFM

Low-speed Rise/Fall time matching

80

120

%

 

 

tUSB_LSDR

Low-speed data rate

1.4775

1.5225

Mbps

 

Average bit rate 1.5 Mbps

 

 

 

 

 

 

± 1.5%

 

 

 

 

 

 

 

tPERIOD_L

Low-speed period

0.657

0.677

μs

 

at 1.5 Mbps

tUSB_DJD21

Source differential driver jitter for con-

–75

75

ns

 

Host (downstream),

 

secutive transactions

 

 

 

 

Note 4

 

 

 

 

 

 

 

tUSB_DJD22

Source differential driver jitter for paired

–45

45

ns

9-39

Host (downstream),

 

transactions

 

 

 

 

Note 4

 

 

 

 

 

 

 

tUSB_DJU21

Source differential driver jitter for con-

–95

95

ns

9-39

Function (downstream),

 

secutive transaction

 

 

 

 

Note 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMD Geode™ SC1200/SC1201 Processor Data Book

 

 

 

 

417

Page 417
Image 417
AMD SC1201 Universal Serial Bus USB 31. USB Timing Parameters, Full Speed Receiver EOP Width Note, Low Speed Source Note