Document No.: FT_000589
FT313H USB2.0 HS Host Controller Datasheet Version 1.1
Clearance No.: FTDI# 318
4.9.4.3 Wake up
The regulator will be in normal operating mode and the clock/oscillator/PLL will be enabled
when either of these conditions is triggered:
1. Dummy read access with a LOW pulse on pins CS_N/CE_N and RD_N /RE_N/OE_N.
2. USB device connects or disconnects.
3. Remote wake up from external USB device.
4. Over current condition is triggered on OC_N if enabled by register.
After wake up automatically set corresponding bit of the CONFIG register, must set the
U_SUSP_U bit of the EOTTIME register to wake up the chip.
4.10 BCD mode
The FT313H is an EHCI-compatible host controller with BCD block function, which follows the
Battery Charging Specification Revision 1.2(BC1.2) by USB-IF. The block function that
emulates USB host port as either Charging Downstream Port (CDP) or Dedicated Charging Port
(DCP) which provides higher current source than Standard Downstream Port (SDP).
The BCD logic block will decode the mode of operation and choose by following setting:
1. BCD function is default enable by CONFIG register bit[5] setting.
2. BCD mode selection is default controlled by external pins configuration. Set CONFIG
register bit[15] to take over BCD mode setting by software.
3. Same configuration by CONFIG register bit[14:13] to set BCD mode if software takes
over control.
CPE1
CPE0
Mode
BCD_EN
Description
0
0
SDP
1
Standard downstream port, VBUS current
limit ≤ 500mA
0
1
DCP
1
Dedicated charging port, USB host no
functional on this port, VBUS current limit ≤
1.5A
1
X
1
X
CDP
X
1
0
Charging downstream port alternative
configuration, VBUS current limit ≤ 1.5A
BCD function disable
Table 4-6 BCD mode configuration
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