Universal Serial Bus (Usb); Table 9-31. Usb Timing Parameters - AMD Geode SC1200 Data Book

Electrical Specifications
9.3.10

Universal Serial Bus (USB)

Symbol Parameter
Full Speed Source (Note 1, Note 2)
t DPOS_Port1,2,3, DNEG_Port1,2,3
USB_R1
Driver Rise Time
t DPOS_Port1,2,3, DNEG_Port1,2,3
USB_F1
Driver Fall Time
t Rise/Fall time matching
USB_FRFM
t Full-speed data rate
USB_FSDR
t Full-speed frame interval
USB_FSF
t Full-speed period between data bits
period_F
t Driver-output resistance
USB DOR
t Source differential driver jitter for con-
USB_DJ11
secutive transition
t Source differential driver jitter for paired
USB_DJ12
transitions
t Source EOP width
USB_SE1
t Differential to EOP transition skew
USB_DE1
t Receiver data jitter tolerance for con-
USB_RJ11
secutive transition
t Receiver data jitter tolerance for paired
USB_RJ12
transitions
Full Speed Receiver EOP Width (Note 4)
t Must reject as EOP
USB_RE11
t Must accept as EOP
USB_RE12
Low Speed Source (Note 1)
t DPOS_Port1,2,3, DNEG_Port1,2,3
USB_R2
Driver Rise Time
t DPOS_Port1,2,3, DNEG_Port1,2,3
USB_F2
Driver Fall Time
t Low-speed Rise/Fall time matching
USB_LRFM
t Low-speed data rate
USB_LSDR
t Low-speed period
PERIOD_L
t Source differential driver jitter for con-
USB_DJD21
secutive transactions
t Source differential driver jitter for paired
USB_DJD22
transactions
t Source differential driver jitter for con-
USB_DJU21
secutive transaction
AMD Geode™ SC1200/SC1201 Processor Data Book

Table 9-31. USB Timing Parameters

Min
4
4
90
11.97 12.03
0.9995 1.0005
83.1
28
–3.5
–4.0
160
–2
–18.5
–9
82
75
(Note 6)
75
(Note 6)
80
1.4775 1.5225
0.657 0.677
–75
–45
–95
32579B
Max Unit Figure Comments
20 ns 9-38
20 ns 9-38
110 %
Mbps
ms
83.5 ns
43 W
3.5 ns 9-39
4.0 ns 9-39
175 ns 9-39
5 ns 9-40
18.5 ns 9-41
9 ns 9-41
40 ns 9-40
ns 9-40
300 ns 9-38
300 ns 9-38
120 %
Mbps
μs
75 ns
45 ns 9-39
95 ns 9-39
(Monotonic) from 10% to
90% of the D_Port lines
(Monotonic) from 90% to
10% of the D_Port lines
Average bit rate 12 Mbps
± 0.25%
1.0 ms ± 0.05%
Average bit rate 12 Mbps
Steady-state drive
Note 3, Note 4
Note 3, Note 4
Note 4, Note 5
Note 4, Note 5
Note 4
Note 4
Note 5
Note 5
(Monotonic) from 10% to
90% of the D_Port lines
(Monotonic) from 90% to
10% of the D_Port lines
Average bit rate 1.5 Mbps
± 1.5%
at 1.5 Mbps
Host (downstream),
Note 4
Host (downstream),
Note 4
Function (downstream),
Note 4
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