Rainbow Electronics W90N745CDG - Manual (Page 395)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 391 - Revision A2
7.3.3 USB Transceiver AC Characteristics
Low Speed: 75ns at C
L
= 50pF, 300ns at C
L
= 350pF Full Speed: 4 to 20ns at C
L
= 50pF
Differential
Data Lines
10%
Rise Time
90%
Fall Time
t
F
t
R
10%
90%
C
L
C
L
Data Signal Rise and Fall Time
USB Transceiver AC Characteristics
SYMBOL DESCRIPTION CONDITIONS MIN MAX UNIT
T
R
Rise Time CL = 50 pF 4 20 ns
T
F
Fall Time CL = 50 pF 4 20 ns
T
RFM
Rise/Fall Time Matching 90 110 %
T
DRATE
Full Speed Data Rate
Average bit rate
(12 Mb/s ± 0.25%)
11.97 12.03 Mbps
7.3.4 EMC RMII AC Characteristics
The signal timing characteristics conforms to the guidelines specified in IEEE Std. 802.3.
PHY_REFCLK
PHY_TXEN
PHY_TXD[1:0]
T
TXO
valid data
T
TXH
T
FREQ
T
RXS
T
RXH
PHY_RXERR
PHY_RXD[1:0]
PHY_CRSDV
T
DUTY
valid data