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AMD Geode SC1201 User Manual

Page 418

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418

AMD Geode™ SC1200/SC1201 Processor Data Book

Electrical Specifications

32579B

t

USB_DJU22

Source differential driver jitter for paired
transactions

–150

150

ns

9-39

Function (downstream),
Note 4

t

USB_SE2

Source EOP width

1.25

1.5

μs

9-40

Note 4, Note 5

t

USB_DE2

Differential to EOP transition skew

–40

100

ns

9-40

Note 5

t

USB_RJD21

Receiver data jitter tolerance for con-
secutive transactions

–152

152

ns

9-41

Host (upstream),
Note 4

t

USB_RJD22

Receiver data jitter tolerance for paired
transactions

–200

200

ns

9-41

Host (upstream),
Note 4

t

USB_RJU21

Receiver data jitter tolerance for con-
secutive transactions

–75

75

ns

9-41

Function (downstream),
Note 4

t

USB_RJU22

Receiver data jitter tolerance for paired
transactions

–45

45

ns

9-41

Function (downstream),
Note 4

Low Speed Receiver EOP Width (Note 5)

t

USB_RE21

Must reject as EOP

330

ns

9-39

t

USB_RE22

Must accept as EOP

675

ns

9-39

Note 1. Unless otherwise specified, all timings use a 50 pF capacitive load (C

L

) to ground.

Note 2. Full-speed timing has a 1.5 K

Ω pull-up to 2.8 V on the DPOS_Port1,2,3 lines.

Note 3. Timing difference between the differential data signals (DPOS_PORT1,2,3 and DNEG_PORT1,2,3).
Note 4. Measured at the crossover point of differential data signals (DPOS_PORT1,2,3 and DNEG_PORT1,2,3).
Note 5. EOP is the End of Packet where DPOS_PORT

t

= DNEG_PORT = SE0. SE0 occurs when output level voltage

V

SE

(Min).

Note 6. C

L

= 350 pF.

Table 9-31. USB Timing Parameters (Continued)

Symbol

Parameter

Min

Max

Unit

Figure

Comments

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