FT311D-32L1C-R datasheet(17/40 Pages) FTDI

17 / 40 page

DS_FT311D

USB ANDROID HOST IC Datasheet

Version 1.2

Document No.: FT_000660 Clearance No.: FTDI# 305

5.5.2.1 SPI Slave Signal Descriptions

Pin No

Name

Type

Description

spi_s0_clk

Input

Slave clock input

spi_s0_mosi

Input

Master Out Slave In

Synchronous data from master to slave

spi_s0_miso

Output

Master In Slave Out

Synchronous data from slave to master

spi_s0_ss#

Input

Slave select

Table 5.4 Data and Control Bus Signal Mode Options - SPI Slave Interface

Note:

The FT311D has to enumerate the Android device before receiving data from the SPI master device.

This can be implemented by disconnecting the SS# signal of SPI Host device until after the FT311D has

established the USB link with Android device.

The connection sequence should be:

1.Connect FT311D to Android and complete enumeration.

2.Connect the SS# of SPI host to FT311D’s SS# then start to communication.

There is a method to implement this function:

1.When FT311D connects to the Android device and enumeration is completed, the USB_ERROR# will

become Logic 0 (default Logic 1). This signal can be used to control the TTL gate (74LVC2G241,

74LVC1G125 or others) ON/OFF such that the Both SS# lines are connected/disconnected.

Figure 5-7 SPI Slave SS gated by Enumeration

FT311D-32L1C-R Datasheet(PDF) 17 Page - Future Technology Devices International Ltd.