t
r
t
f
V
CRS
90% V
OH
10% V
OL
USB0_DM
USB0_DP
t
- t
per
jr
OMAP-L137
www.ti.com
SPRS563G – SEPTEMBER 2008 – REVISED JUNE 2014
6.26.1 USB2.0 Electrical Data/Timing
The USB PHY PLL can support input clock of the following frequencies: 12.0 MHz, 13.0 MHz, 19.2 MHz,
20.0 MHz, 24.0 MHz, 26.0 MHz, 38.4 MHz, 40.0 MHz or 48.0 MHz. USB_REFCLKIN jitter tolerance is 50
ppm maximum.
Table 6-99. Switching Characteristics Over Recommended Operating Conditions for USB2.0 (see
Figure 6-66
)
LOW SPEED
FULL SPEED
HIGH SPEED
1.5 Mbps
12 Mbps
480 Mbps
No.
PARAMETER
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
1
t
r(D)
Rise time, USB0_DP and USB0_DM signals
(1)
75
300
4
20
0.5
ns
2
t
f(D)
Fall time, USB0_DP and USB0_DM signals
(1)
75
300
4
20
0.5
ns
3
t
rfM
Rise/Fall time, matching
(2)
80
120
90
111
–
–
%
4
V
CRS
Output signal cross-over voltage
(1)
1.3
2
1.3
2
–
–
V
5
t
jr(source)NT
Source (Host) Driver jitter, next transition
2
2
(3)
ns
t
jr(FUNC)NT
Function Driver jitter, next transition
25
2
(3)
ns
6
t
jr(source)PT
Source (Host) Driver jitter, paired transition
(4)
1
1
(3)
ns
t
jr(FUNC)PT
Function Driver jitter, paired transition
10
1
(3)
ns
7
t
w(EOPT)
Pulse duration, EOP transmitter
(5)
1250
1500
160
175
–
–
ns
8
t
w(EOPR)
Pulse duration, EOP receiver
(5)
670
82
–
ns
9
t
(DRATE)
Data Rate
1.5
12
480
Mb/s
10
Z
DRV
Driver Output Resistance
–
–
40.5
49.5
40.5
49.5
Ω
11
Z
INP
Receiver Input Impedance
100k
100k
-
-
Ω
(1)
Low Speed: C
L
= 200 pF, Full Speed: C
L
= 50 pF, High Speed: C
L
= 50 pF
(2)
t
RFM
= (t
r
/t
f
) x 100. [Excluding the first transaction from the Idle state.]
(3)
For more detailed information, see the Universal Serial Bus Specification Revision 2.0, Chapter 7. Electrical.
(4)
t
jr
= t
px(1)
- t
px(0)
(5)
Must accept as valid EOP
Figure 6-66. USB0 Integrated Transceiver Interface Timing
6.26.2 USB0 Unused Signal Configuration
If USB0 is unused, then the USB0 signals should be configured as shown in
Section 3.7.22
.
Copyright © 2008–2014, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
189
Submit Documentation Feedback
Product Folder Links:
OMAP-L137
Содержание OMAP-L137 EVM
Страница 221: ......