OMAPL137-HT Datasheet, PDF (338/444 Pages) Texas Instruments – Multimedia Device

OMAP4460
Public Version
SWPS046A – JANUARY 2012
(1) Related to the maximum USB HSIC frequency.
(2) P = output clock period in ns
(3) See DM Operating Condition Addendum for CORE OPP voltages.
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SB2 SB3
SB1
SLIMBUS_CLK
SB4
SB5
SLIMBUS_DATA
SWPS040-149
Figure 5-92. High-Speed USBB1—HSIC DDR Receive And Transmit Modes—1.2 V
5.6.8.4 Universal Serial Bus (USB)—USBB2
NOTE
For more information, see the Serial Communication Interface / High-Speed Multiport USB
Host Subsystem section of the OMAP4460 TRM.
5.6.8.4.1 Low- / Full-Speed USBB2 (FSUSB)—Bidirectional Standard 4-pin Mode
Table 5-154 and Table 5-155 assume testing over the recommended operating conditions and electrical
characteristic conditions below (see Figure 5-93).
Table 5-153. Low- / Full-Speed USBB2 Timing Conditions—Bidirectional Standard 4-pin Mode—1.8 V^(1)(2)(3)
TIMING CONDITION PARAMETER
VALUE
UNIT
MIN
MAX
Input Conditions
t_R
Input signal rise time
t_F
Input signal fall time
PCB Conditions
2
ns
2
ns
Number of external peripherals
1
Far end load
10
pF
Trace length
10
cm
Characteristics impedance
30
60
Ω
(1) IO settings:
– usbb2_mm_txen (ball AC28): MB[1:0] = 10, LB0 = 1
– usbb2_mm_txdat (ball AF24): MB[1:0] = 10, LB0 = 1
– usbb2_mm_txse0 (ball AE24): MB[1:0] = 10, LB0 = 1
– usbb2_mm_rxrcv (ball AD25): MB[1:0] = 10, LB0 = 1
For more information, see Control Module / Control Module Functional Description/ Functional Register Description / Signal Integrity
Parameter Control Registers with Pad Group Assignment / 50-Ω Output Buffer I/Os with Combined Mode and Load Settings section
of the OMAP4460 TRM.
– Corresponding voltage: 1.8 V
(2) In this table the rise and fall times are calculated for 10% to 90% of VDDS. For more information on the corresponding OMAP4 VDDS
power supply name, see Table 2-1, POWER [9] column with the ball name.
(3) To have an idea of the output OMAP4 ball load supported for this application, you can consider the following:
Output OMAP4 ball load = Far End load + 1.34 pF/cm typical x trace length (cm).
338 Timing Requirements and Switching Characteristics
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