FT311D-32L1C-R datasheet(18/40 Pages) FTDI

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DS_FT311D

USB ANDROID HOST IC Datasheet

Version 1.2

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

5.5.3 Serial Peripheral Interface – SPI Master

FT311 - SPI Master

External - SPI Slave

CLK

SS#

MISO

MOSI

Figure 5-8 SPI Master block diagram

The SPI Master interface is used to interface to applications such as Real time clocks and audio codecs.

The SPI Master provides the following features:



Synchronous serial data link.



Full and half duplex data transmission.



Serial clock with programmable frequency, polarity and phase.



One slave select output.

5.5.3.1 SPI Master Signal Descriptions.

Table 5.5 shows the SPI master signals and the pins

Pin No

Name

Type

Description

spi_m_clk

Output

SPI master clock input

spi_m_mosi

Output

Master Out Slave In

Synchronous data from master to slave

spi_m_miso

Input

Master In Slave Out

Synchronous data from slave to master

spi_m_ss_0#

Output

Active low slave select 0 from master to

slave

Table 5.5 SPI Master Signal Names

The main purpose of the SPI Master block is to transfer data between an external SPI interface and the

FT311D.

An SPI master interface transfer can only be initiated by the SPI Master and begins with the slave select

signal being asserted. This is followed by a data byte being clocked out with the master supplying SCLK.

The master typically supplies the first byte, which is called a command byte. After this the desired

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