SC3200 datasheet(418/447 Pages) AMD

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418

AMD Geode™ SC3200 Processor Data Book

Electrical Specifications

Revision 5.1

9.3.9

Universal Serial Bus (USB) Interface

Table 9-28. 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

Driver Rise Time

9-37

(Monotonic) from 10% to

90% of the D_Port lines

tUSB_F1

DPOS_Port1,2,3, DNEG_Port1,2,3

Driver Fall Time

9-37

(Monotonic) from 90% to

10% of the D_Port lines

tUSB_FRFM

Rise/Fall time matching

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

1.0 ms

± 0.05%

tperiod_F

Full-speed period between data bits

83.1

83.5

Average bit rate 12 Mbps

tUSB DOR

Driver-output resistance

Steady-state drive

tUSB_DJ11

Source differential driver jitter for con-

secutive transition

–3.5

3.5

9-38

Note 3, Note 4

tUSB_DJ12

Source differential driver jitter for paired

transitions

–4.0

4.0

9-38

Note 3, Note 4

tUSB_SE1

Source EOP width

160

175

9-38

Note 4, Note 5

tUSB_DE1

Differential to EOP transition skew

–2

9-39

Note 4, Note 5

tUSB_RJ11

Receiver data jitter tolerance for con-

secutive transition

–18.5

18.5

9-40

Note 4

tUSB_RJ12

Receiver data jitter tolerance for paired

transitions

–9

9-40

Note 4

Full Speed Receiver EOP Width (Note 4)

tUSB_RE11

Must reject as EOP

9-39

Note 5

tUSB_RE12

Must accept as EOP

9-39

Note 5

Low Speed Source (Note 1)

tUSB_R2

DPOS_Port1,2,3, DNEG_Port1,2,3

Driver Rise Time

300

(Note 6)

9-37

(Monotonic) from 10% to

90% of the D_Port lines

tUSB_F2

DPOS_Port1,2,3, DNEG_Port1,2,3

Driver Fall Time

300

(Note 6)

9-37

(Monotonic) from 90% to

10% of the D_Port lines

tUSB_LRFM

Low-speed Rise/Fall time matching

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-

secutive transactions

–75

Host (downstream),

Note 4

tUSB_DJD22

Source differential driver jitter for paired

transactions

–45

9-38

Host (downstream),

Note 4

tUSB_DJU21

Source differential driver jitter for con-

secutive transaction

–95

9-38

Function (downstream),

Note 4

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