AM1707_16 Datasheet, PDF (169/200 Pages) Texas Instruments – AM1707 ARM® Microprocessor

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AM1707
SPRS637E – FEBRUARY 2010 – REVISED JUNE 2014
6.26.1 USB2.0 (USB0) 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 6-97. Switching Characteristics Over Recommended Operating Conditions for USB2.0 [USB0] (see
Figure 6-66)
No.
PARAMETER
LOW SPEED
1.5 Mbps
FULL SPEED
12 Mbps
MIN MAX MIN MAX
1 t_r(D)
2 t_f(D)
3 t_rfM
4 V_CRS
Rise time, USB0_DP and USB0_DM signals⁽¹⁾
Fall time, USB0_DP and USB0_DM signals⁽¹⁾
Rise/Fall time, matching⁽²⁾
Output signal cross-over voltage⁽¹⁾
75
300
4
20
75
300
4
20
80
120
90
111
1.3
2
1.3
2
5 t_jr(source)NT Source (Host) Driver jitter, next transition
2
2
t_jr(FUNC)NT Function Driver jitter, next transition
6 t_jr(source)PT Source (Host) Driver jitter, paired transition⁽⁴⁾
25
2
1
1
t_jr(FUNC)PT
7 t_w(EOPT)
8 t_w(EOPR)
Function Driver jitter, paired transition
Pulse duration, EOP transmitter ⁽⁵⁾
Pulse duration, EOP receiver ⁽⁵⁾
10
1
1250 1500 160
175
670
82
9 t_(DRATE)
Data Rate
1.5
12
10 Z_DRV
Driver Output Resistance
–
–
40.5 49.5
11 Z_INP
Receiver Input Impedance
100k
100k
(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
HIGH SPEED
480 Mbps
MIN MAX
0.5
0.5
–
–
–
–
–
–
40.5
-
(3)
(3)
(3)
–
480
49.5
-
UNIT
ns
ns
%
V
(3)_ns
ns
ns
ns
ns
ns
Mb/s
Ω
Ω
USB0_DM
V_CRS
USB0_DP
10% V_OL
t_per - t_jr
90% V_OH
t_r
t_f
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 3.6.22.
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Peripheral Information and Electrical Specifications 169
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