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Electrical Specifications
Symbol
Parameter
t
Source differential driver jitter for paired
USB_DJU22
transactions
t
Source EOP width
USB_SE2
t
Differential to EOP transition skew
USB_DE2
t
Receiver data jitter tolerance for con-
USB_RJD21
secutive transactions
t
Receiver data jitter tolerance for paired
USB_RJD22
transactions
t
Receiver data jitter tolerance for con-
USB_RJU21
secutive transactions
t
Receiver data jitter tolerance for paired
USB_RJU22
transactions
Low Speed Receiver EOP Width (Note 5)
t
Must reject as EOP
USB_RE21
t
Must accept as EOP
USB_RE22
Note 1. Unless otherwise specified, all timings use a 50 pF capacitive load (C
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_PORT
V
(Min).
SE
Note 6. C
= 350 pF.
L
AMD Geode™ SC3200 Processor Data Book
Table 9-28. USB Timing Parameters (Continued)
Min
–150
1.25
–40
–152
–200
–75
–45
675
t
= DNEG_PORT = SE0. SE0 occurs when output level voltage ≤
32581C
Max
Unit
Figure Comments
150
ns
9-38
μs
1.5
9-39
100
ns
9-39
152
ns
9-40
200
ns
9-40
75
ns
9-40
45
ns
9-40
330
ns
9-38
ns
9-38
) to ground.
L
Function (downstream),
Note 4
Note 4, Note 5
Note 5
Host (upstream),
Note 4
Host (upstream),
Note 4
Function (downstream),
Note 4
Function (downstream),
Note 4
401
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