 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
I.MX27L Datasheet(PDF) 24 Page - Freescale Semiconductor, Inc |
|
||||||||||||||||||||||||||||||
I.MX27L Datasheet(HTML) 24 Page - Freescale Semiconductor, Inc |
|
|
24 / 152 page  i.MX27 and i.MX27L Data Sheet, Rev. 1.7 24 Freescale Semiconductor Functional Description and Application Information • Bypass mode to route Host Port 1 signals to OTG I/O port • High Speed /Full Speed/Low Speed Host Only core (Host 2) • Full Speed/Low Speed interface for Serial transceiver • TLL function for direct connection to USB peripheral in FS/LS (serial) operation • High-speed OTG core The USB module has two main modes of operation: Normal mode and Bypass mode. Furthermore, the USB interfaces can be configured for high-speed operation (480 Mbps) and/or full/low speed operation (12/1.5 Mbps). In Normal mode, each USB core controls its corresponding port. In additional to th4e major operational modes, each port can work in one or more modes, as follows: PHY mode In PHY mode, an external serial transceiver is connected to the port. This is used for off-board USB connections. TLL mode In TLL mode, internal logic is enabled to emulate the functionality of two back-to-back connected transceivers. This mode is typically used for on-board USB connections to USB-capable peripherals. Host Port 2 supports ULPI and Serial Transceivers. The OTG port requires a transceiver and is intended for off-board USB connections. Serial Interface mode In serial mode, a serial OTG transceiver must be connected. The port does not support dedicated signals for OTG signaling. Instead, a transceiver with built-in OTG registers must be used. Typically, the transceiver registers are accessible over an I2C or SPI interface. ULPI mode In this mode, a ULPI transceiver is connected to the port pins to support high-speed off board USB connection. Bypass mode Bypass mode affects the operation of the OTG port and Host Port 1. This mode is only available when a serial transceiver is used on the OTG port, and the peripheral device on Port 1 is using a TLL connection. Bypass mode is activated by setting the bypass bit in the USBCONTROL register. In this mode, the USB OTG port connections are internally routed to the USB Host 1 port, such that the transceiver on the OTG port connects to a peripheral USB device on Host Port 1. The OTG core and the Host 1 core are disconnected from their ports when bypass is active. Low Power mode Each of the three USB cores has an associated power control module that is controlled by the USB core and clocked on a 32-kHz clock. When a USB bus is idle, the transceiver can be placed in low-power mode (suspend), after which the clocks to the USB core can be stopped. The 32-kHz low power clock must remain active as it is needed for walk-up detection. 2.3.37 Watchdog Timer Module (WDOG) The Watchdog Timer module (WDOG) protects against system failures by providing a method of escaping from unexpected events or programming errors. Once the WDOG module is activated, it must be serviced by software on a periodic basis. If servicing does not take place, the timer times out. Upon a time-out, the WDOG Timer module either asserts the wdog signal or a system reset signal wdog_rst, depending on software configuration. The WDOG Timer module also generates a system reset via a software write to |
Similar Part No. - I.MX27L_11 |
|
Similar Description - I.MX27L_11 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
