SH7720 Datasheet, PDF (817/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 23 USB Pin Multiplex Controller
Section 23 USB Pin Multiplex Controller
23.1 Features
The USB multiplex controller controls the data path to USB transceiver from USB host controller
port 1 or USB function controller.
Both USB host port 1 and USB function controller are connected to USB transceiver 1 via
multiplexer that is controlled by UTRCTL register. The USB host controller port 2 and USB
transceiver 2 are connected one-to-one. USB transceiver 1 can be connected to USB host
controller or USB function controller, while USB transceiver 2 can only be connected to the USB
host controller. Because these ports and transceivers are controlled individually, USB transceiver 2
can be connected to either the USB host controller or the USB function controller regardless its
status. The signals to USB transceiver are used as external pins USB1d _**** which are
multiplexed with pins 113 to 123.
Figure 23.1 shows the connections between the on-chip USB host controller of this LSI, the USB
function controller, and the on-chip 2-port USB transceiver.
USB host
pwr_en
Power
ovr_current
Port 2
Control
transceiver
Power
Port 1
Control
transceiver
Transceiver signal
pwr_en
ovr_current
pwr_en/
pull-up control pin
multiplexer
ovr_current/
VBUS
multiplexer
Control
USB function
Power
Port 1
Control
transceiver
VBUS
Transceiver signal
USB
host/function
transceiver
signals
multiplexer
Selector Selector
USB
transceiver
2
USB digital signal
USB
transceiver
1
USB2_pwr_en
USB2_ovr_current
USB2_P
USB2_M
USB1_pwr_en/USBF_UPLUP
USB1_ovr_current/
USBF_VBUS
USB1d_****
USB1_P
USB1_M
Figure 23.1 Block Diagram of USB PIN Multiplexer
Rev. 3.00 Jan. 18, 2008 Page 755 of 1458
REJ09B0033-0300