AMD Geode SC1201 - Manual (Page 418)

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