Rainbow Electronics AT91CAP9S250A - Manual (Page 983)

983
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
47.10.10 UDP Timings
Figure 47-13. USB Data Signal Rise and Fall Times
or
Figure 47-14. USB Data Signal Rise and Fall Times
10% 10%
90%
V
CRS
t
R
t
F
Differential
Data Lines
Rise Time Fall Time
Fosc = 6MHz/750kHz
R
EXT
=27 ohms
C
load
Buffer
(b)
(a)
10% 10%
90%
V
CRS
t
R
t
F
Differential
Data Lines
Rise Time Fall Time
Fosc = 6MHz/750kHz
R
EXT
=39 ohms
C
load
Buffer
(b)
(a)
Table 47-43. In Full Speed
Symbol Parameter Conditions Min Typ Max Unit
t
FR
Transition Rise Time C
LOAD
= 50 pF TBD TBD ns
t
FE
Transition Fall Time C
LOAD
= 50 pF TBD TBD ns
t
FRFM
Rise/Fall time Matching TBD TBD %