FT313HQ-R datasheet(19/67 Pages) ETC2

19 / 67 page

Document No.: FT_000589

FT313H USB2.0 HS Host Controller Datasheet Version 1.2

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

3. Same configuration by CONFIG register bit[14:13] to set BCD mode if software takes

over control.

CPE1

CPE0

Mode

BCD_EN

Description

SDP

Standard downstream port, VBUS current

limit ≤ 500mA

DCP

Dedicated charging port, USB host no

functional on this port, VBUS current limit ≤

1.5A

CDP

Charging downstream port alternative

configuration, VBUS current limit ≤ 1.5A

BCD function disable

Table 4-6 BCD mode configuration

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