Electrical Specifications

32580B

Table 9-29. USB Timing Parameters (Continued)

Symbol

Parameter

Min

Max

Unit

Figure

Comments

 

 

 

 

 

 

 

tUSB_DJU22

Source differential driver jitter for paired

–150

150

ns

9-38

Function (downstream),

 

transactions

 

 

 

 

Note 4

 

 

 

 

 

 

 

tUSB_SE2

Source EOP width

1.25

1.5

μs

9-39

Note 4, Note 5

tUSB_DE2

Differential to EOP transition skew

–40

100

ns

9-39

Note 5

tUSB_RJD21

Receiver data jitter tolerance for con-

–152

152

ns

9-40

Host (upstream),

 

secutive transactions

 

 

 

 

Note 4

 

 

 

 

 

 

 

tUSB_RJD22

Receiver data jitter tolerance for paired

–200

200

ns

9-40

Host (upstream),

 

transactions

 

 

 

 

Note 4

 

 

 

 

 

 

 

tUSB_RJU21

Receiver data jitter tolerance for con-

–75

75

ns

9-40

Function (downstream),

 

secutive transactions

 

 

 

 

Note 4

 

 

 

 

 

 

 

tUSB_RJU22

Receiver data jitter tolerance for paired

–45

45

ns

9-40

Function (downstream),

 

transactions

 

 

 

 

Note 4

 

 

 

 

 

 

 

Low Speed Receiver EOP Width (Note 5)

 

 

 

 

 

 

 

 

 

 

 

 

tUSB_RE21

Must reject as EOP

 

330

ns

9-38

 

tUSB_RE22

Must accept as EOP

675

 

ns

9-38

 

Note 1. Unless otherwise specified, all timings use a 50 pF capacitive load (CL) to ground. Note 2. Full-speed timing has a 1.5 KΩ 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_PORTt = DNEG_PORT = SE0. SE0 occurs when output level voltage

VSE (Min).

Note 6. CL = 350 pF.

AMD Geode™ SC2200 Processor Data Book

421

Page 403
Image 403
AMD SC2200 Source EOP width, Host upstream, Receiver data jitter tolerance for paired, Low Speed Receiver EOP Width Note