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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Technical brief
3.1.9 USB
The digital baseband controller USB function blocks both have a full speed transceiver
interface and a ULPI 1.1 Single Data Rate (SDR) interface used for High Speed USB
transceiver. The interface selection is controlled by the SYSCON and the pinout selection in
the PADMUX.
The transceiver is external to the platform. The type of external transceiver used determines
the USB hardware capability of the product. The transceiver interface supports the following
external transceiver types :
y High speed PHY with SDR USB Low Pin Interface (ULPI). The ULPI mode consists of 12
signals (eight (SDR) data, clock, next, stop, and direction). Both full speed USB operation
and high speed USB operation is possible. USB/UART multiplexing is possible by selecting
the appropriate external ULPI transceiver with the built-in multiplexer.
y Full speed PHY using a standard 4-pin differential interface with DP/DM/OE and RCV and
sideband signaling for USBVbus detect, PullUpEnable, and suspend. This mode only
supports USB full speed device operation. USB/UART multiplexing is possible by selecting
the appropriate external full speed transceiver with the built-in multiplexer.
y Full speed PHY using a standard 3-pin single-ended interface with DAT/SE0/OE or full
speed PHY using a standard 4-pin differential interface with DP/DM/OE and RCV, both with
sideband signaling using I2C.
Table 3-1-6. USB Signal Interface of DB3150
USB Function Note
USB_DAT_VM Data line, bidirectional negative differential signal
USB_DAT_VP Data line, bidirectional positive differential signal
USB_OE Output enable
ACC_USB_SUSPND Signal to put the transceiver in low power mode
ACC_USB_PUEN Pull up control
ACC_USB_RCV Receiver output from differential receiver
ACC_USB_VBDET VBUS detection input
USBPRB If connected to DCON, it indicates a Full speed transceiver
VBUS Power supply for AB3000 USB block
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