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Only for training and service purposes
3. Technical Brief
3.14.2.3. HS-USB
The universal serial bus (USB) is an interconnection standard widely supported by the electronic
industry. The USB2.0 spec defines data rates as low-speed (1.5 Mbps), full-speed (12Mbps) and hi-speed
(480 Mbps). When two devices are connected via a USB interface, one of the devices must act as a host,
and the other device must act as a peripheral. The host is responsible for initiating and controlling traffic on
the bus. The USB specification requires personal computers (PCs) to act as hosts, and other devices such as
printers, keyboards, mice, etc. to act as peripherals. The OTG supplement creates a new class of devices
called OTG devices. OTG devices can act as either hosts or peripherals, depending upon how they are
connected and/or used.
The MSM7200A device contains a new USB high-speed function that is based on a embedded UTMI+
core with a UTMI+ low pin interface (ULPI) compatible port. The MSM device’s ULPI interface connects to an
external ULPI PHY chip to complete the design. The ULPI core embedded in the MSM along with the
PM7540 IC and a USB high-speed PHY IC provide support for the high-speed interface.
Table. HSUSB Signal Interface
Figure. USB block(MSM7200A Side & ISP1508AET, MAX14526 Side)
MSM7200A
USBH_CLK
USBH_DATA[0:7]
USBH_DM
u-USB
Connector.
ISP1508AET
PM7540
USBH_DIR
USBH_NEXT
USBH_STOP
USBH_CS
USBH_DP
MAX14526
MAX_DP
MAX_DM
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