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
CLK
SS#
External - SPI Slave
FT311 - SPI Master
MOSI
MISO
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
Name
Type
Description
Pin No
spi_m_clk
Output
SPI master clock input
29
Master Out Slave In
spi_m_mosi
spi_m_miso
Output
Input
30
Synchronous data from master to slave
Master In Slave Out
31
26
Synchronous data from slave to master
Active low slave select 0 from master to
slave
spi_m_ss_0# Output
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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