AMD Geode™ SC2200 Processor Data Book 421
Electrical Specifications 32580B
tUSB_DJU22 Source differential driver jitter for paired
transactions
–150 150 ns 9-38 Function (downstream),
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 10 0 ns 9-39 Note 5
tUSB_RJD21 Receiver data jitter tolerance for con-
secutive transactions
–152 152 ns 9-40 Host (upstream),
Note 4
tUSB_RJD22 Receiver data jitter tolerance for paired
transactions
–200 200 ns 9-40 Host (upstream),
Note 4
tUSB_RJU21 Receiver data jitter tolerance for con-
secutive transactions
–75 75 ns 9-40 Function (downstream),
Note 4
tUSB_RJU22 Receiver data jitter tolerance for paired
transactions
–45 45 ns 9-40 Function (downstream),
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.
Table 9-29. USB Timing Parameters (Continued)
Symbol Parameter Min Max Unit Figure Comments