USB3300_06 SMSC [SMSC Corporation], USB3300_06 Datasheet - Page 32

• Manufacturer Part Number: USB3300_06
• Description: Hi-Speed USB Host, Device or OTG PHY with ULPI Low Pin Interface
• Manufacturer: SMSC [SMSC Corporation]

Revision 1.06 (07-19-06)
6.1.7.1
6.1.7.2
6.1.7.3
6.1.7.4
6.1.7.5
6.1.7.6
The USB3300 transmitter will transmit a 32-bit long high speed synch before every high speed packet.
In full and low speed modes a 8-bit synch is transmitted.
When the device or host needs to chirp for high speed port negotiation, the Opmode Bits=10 will turn
off the bit-stuffing and NRZI encoding in the transmitter. At the end of a chirp, the USB3300 Opmode
register bits should be changed only after the RXCMD linestate encoding indicates that the transmitter
has completed transmitting. Should the opmode be switched to normal bit-stuffing and NRZI encoding
before the transmit pipeline is empty, the remaining data in the pipeline may be transmitted in an bit-
stuff encoding format.
Please refer to the ULPI specification for a detailed discussion of USB reset and HS chirp.
High Speed Long EOP
When operating as a Hi-Speed host, the USB3300 will automatically generate a 40 bit long End of
Packet (EOP) after a SOF PID (A5h). The USB3300 determines when to send the 40-bit long EOP by
decoding the ULPI TXD CMD bits [3:0] for the SOF. The 40-bit long EOP is only transmitted when the
DpPulldown and DmPulldown bits are asserted. The Hi-Speed 40-bit long EOP is used to detect a
disconnect in high speed mode.
In device mode, the USB3300 will not send a long EOP after a SOF PID.
Low Speed Keep-Alive
Low speed keep alive is supported by the USB3300. When in Low speed (10b), the USB3300 will send
out two Low speed bit times of SE0 when a SOF PID is received.
UTMI+ Level 3
Pre-amble is supported for UTMI+ Level 3 compatibility. When Xcvrselect is set to (11b) in host mode,
(dpPulldown and dmPulldown both asserted) the USB3300 will pre-pend a full speed pre-amble before
the low speed packet. Full speed rise and fall times are used in this mode. The pre-amble consists of
the following: Full speed sync, the encoded pre-PID (C3h) and then full speed idle (DP=1 and DM =
0). A low speed packet follows with a sync, data and a LS EOP.
Host Resume K
Resume K generation is supported by the USB3300. When the USB3300 exits the suspended low
power state, the USB3300, when operating as a host, will transmit a K on DP/DM. The transmitters
will end the K with SE0 for two Low Speed bit times. If the USB3300 was operating in high speed
mode before the suspend, the host must change to high speed mode before the SE0 ends. SE0 is
two low speed bit times which is about 1.2 us.
The ULPI specification has an explicit discussion of the resume sequence and the order of operations
required.
In device mode, the resume K will not append a SE0 but release the DP/ DM lines to allow the pull
up to return the bus to the correct idle state, depending upon the operational mode of the USB3300.
Refer to
No SYNC and EOP Generation (Opmode 11) (optional)
UTMI+ defines an opmode 11 where no sync and EOP generation occurs in Hi-Speed operation. This
is an option to the ULPI specification and not implemented in the USB3300.
Typical USB Transmit with ULPI
Figure 6.6
TXD CMD where DATA[7:6] = 01b, DATA[5:4] = 00b, and Data[3:0] = PID. The TX CMD with the PID
is followed by transmit data. Form the time the data is clocked into the transmitter it will appear at DP
and DM 11 high speed bit times later. This time is the HS_TX_START_DELAY.
Table
shows a typical USB transmit sequence. A transmit sequence starts by the Link sending a
6.8.
DATASHEET
Hi-Speed USB Host, Device or OTG PHY with ULPI Low Pin Interface
32
SMSC USB3300
Datasheet