420 AMD Geode™ SC2200 Processor Data Book
Electrical Specifications
32580B
9.3.9 Universal Serial Bus (USB) InterfaceTable 9-29. USB Timing Parameters
Symbol Parameter Min Max Unit Figure Comments
Full Speed Source (Note 1, Note 2)
tUSB_R1 DPOS_Port1,2,3, DNEG_Port1,2,3
Driver Rise Time
4 20 ns 9-37 (Monotonic) from 10% to
90% of the D_Port lines
tUSB_F1 DPOS_Port1,2,3, DNEG_Port1,2,3
Driver Fall Time
4 20 ns 9-37 (Monotonic) from 90% to
10% of the D_Port lines
tUSB_FRFM Rise/Fall time matching 90 110 %
tUSB_FSDR Full-speed data rate 11.97 12.03 Mbps Average bit rate 12 Mbps
± 0.25%
tUSB_FSF Full-speed frame interval 0.9995 1.0005 ms 1.0 ms ± 0.05%
tperiod_F Full-speed period between data bits 83.1 83.5 ns Average bit rate 12 Mbps
tUSB DOR Driver-output resistance 28 43 W Steady-state drive
tUSB_DJ11 Source differential driver jitter for con-
secutive transition
–3.5 3.5 ns 9-38 Note 3, Note 4
tUSB_DJ12 Source differential driver jitter for paired
transitions
–4.0 4.0 ns 9-38 Note 3, Note 4
tUSB_SE1 Source EOP width 160 175 ns 9-38 Note 4, Note 5
tUSB_DE1 Differential to EOP transition skew –2 5 ns 9-39 Note 4, Note 5
tUSB_RJ11 Receiver data jitter tolerance for con-
secutive transition
–18.5 18.5 ns 9-40 Note 4
tUSB_RJ12 Receiver data jitter tolerance for paired
transitions
–9 9 ns 9-40 Note 4
Full Speed Receiver EOP Width (Note 4)
tUSB_RE11 Must reject as EOP 40 ns 9-39 Note 5
tUSB_RE12 Must accept as EOP 82 ns 9-39 Note 5
Low Speed Source (Note 1)
tUSB_R2 DPOS_Port1,2,3, DNEG_Port1,2,3
Driver Rise Time
75 300
(Note 6)
ns 9-37 (Monotonic) from 10% to
90% of the D_Port lines
tUSB_F2 DPOS_Port1,2,3, DNEG_Port1,2,3
Driver Fall Time
75 300
(Note 6)
ns 9-37 (Monotonic) from 90% to
10% of the D_Port lines
tUSB_LRFM Low-speed Rise/Fall time matching 80 120 %
tUSB_LSDR Low-speed data rate 1.4775 1.5225 Mbps Average bit rate 1.5 Mbps
± 1.5%
tPERIOD_L Low-speed period 0.657 0.677 μs at 1.5 Mbps
tUSB_DJD21 Source differential driver jitter for con-
secutive transactions
–75 75 ns Host (downstream),
Note 4
tUSB_DJD22 Source differential driver jitter for paired
transactions
–45 45 ns 9-38 Host (downstream),
Note 4
tUSB_DJU21 Source differential driver jitter for con-
secutive transaction
–95 95 ns 9-38 Function (downstream),
Note 4