Datasheet

UCLK
STP
DIR_&_NXT
DATA[7:0]
Data_OUT Data_IN
HSU0
HSU3
HSU3
HSU6 HSU7
HSU1 HSU1
HSU4
HSU5
HSU2 HSU2
037-049
TPS65930/TPS65920
www.ti.com SWCS037G–MAY 2008–REVISED APRIL 2011
Figure 7-3. HS-USB Interface—Transmit and Receive Modes (ULPI 8-bit)
NOTE
ULPI data [7:0] lines are set to 1 after USB PHY power up, and before the clock signal is
stable.
The input timing requirements are given by considering a rising or falling time of 1 ns (see Table 7-1).
Table 7-1. HS-USB Interface Timing Requirements
Notation Parameter Min Max Unit
HSU4 t
s(STPV-CLKH)
Setup time, STP valid before UCLK rising 6 ns
edge
HSU5 t
h(CLKH-STPIV)
Hold time, STP valid after UCLK rising edge 0 ns
Setup time, DATA[0:7] valid before UCLK 6
HSU6 t
s(DATAV-CLKH)
ns
rising edge
Hold time, DATA[0:7] valid after UCLK rising 0
HSU7 t
h(CLKH-DATIV)
ns
edge
Table 7-2 lists the HS-USB interface switching requirements.
Table 7-2. HS-USB Interface Switching Requirements
(1)
Notation Parameter
(1)
Min Typ Max Unit
HSU0 f
p(CLK)
UCLK clock frequency Steady state 58.42 60 61.67 MHz
HSU1 t
W(CLK)
UCLK duty cycle Steady state 48.3% 50% 51.7%
Delay time, UCLK rising edge to Steady state 0 9
t
d(CLKH-DIR)
ns
DIR transition
HSU2
Delay time, UCLK rising edge to Steady state 0 9
t
d(CLKH-NXTV)
ns
NXT transition
Delay time, UCLK rising edge to Steady state 0 9
HSU3 t
d(CLKH-DATV)
ns
DATA[0:7] transition
(1) The capacitive load for output data and control load is 10 pF (rising and falling time is 2 ns).
The capacitive load for the CLK port is 6 pF (rising and falling time is 1 ns).
The HS-USB interface has only one state: the steady state.
7.1.3 USB-CEA Carkit Port Timing
This mode allows the link for communication through the USB PHY to a remote carkit in CEA audio + data
during audio (DDA) mode as defined in the CEA-936A specification. In this mode, the ULPI data bus is
redefined as a 2-pin UART interface, which exchanges data through a direct access to the FS/LS analog
transmitter and receiver.
Copyright © 2008–2011, Texas Instruments Incorporated USB Transceiver 71
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