Cypress CY4603, User Manual, Page: 60 / 94

60 HX3 Kits User Guide, Doc. #: 001-91203 Rev. *D
Hardware
5.1.2 Theory of Operation
This section provides a block-level description of the CY4609 hardware illustrated in Figure 5-1 .
Figure 5-1. CY4609 Hardware Block Diagram
The CY4609 RDK is based on the CYUSB3304-68LTXC hub controller. It is a small form-factor hard-
ware supporting four USB 3.0 downstream ports that conform to USB 3.0 and BC v1.2 specifica-
tions. The ports also support Ghost Charging and emulate Apple charging. The upstream port is
implemented using a USB 3.0 micro-B connector.
The RDK is shipped with a 5-V AC-DC adapter with a current rating of 4 A. However, the hardware is
designed to support operation with an AC-DC adapter with up to a 6-A current rating.
The CYUSB3304-68LTXC hub controller is clocked using a 26-MHz crystal on the board.
The HX3 hub controller supports an I
2
C communication interface; it can support both slave and mas-
ter modes. On the RDK, an EEPROM is connected to the hub controller on this interface to store the
configuration data and firmware.
CYUSB3304-68LTXC
Downstream
Port 1
Upstream Port
Downstream
Port 2
Downstream
Port 3
Downstream
Port 4
D+
/
D-
D+ /
D-
D+
/
D
-
SS
Rx /
SS
Tx
Gang Power
Switch
I2C EEPROM
3.3V
Regulator
1.2V
Regulator
5V DC
Jack
External Reset
Generation
Logic
I2C BUS
AVDD33
AVDD12
26MHz
Crystal
XTAL_IN
OVER
CURR
PWR_EN
XTAL_OUT
RESETN
SS
R
x /
SST
x
Power lines
USB 3.0 lines
USB 2.0 lines
Signal lines
SS
R
x /
SST
x
D+
/
D
-
SSRx
/
SS
Tx
D
+
/
D
-
SS
R
x /
SS
T
x
2