Datasheet

SPI
Intel
®
Quark™ microcontroller D2000
Datasheet January 2016
232 Document Number: 333577-002EN
Bits Access
Type
Default Description PowerWell ResetSignal
When the SPI Controller is
configured as a slave in
loopback mode, the ss_in_n
and ssi_clk signals must be
provided by an external
source. In this mode, the
slave cannot generate these
signals because there is
nothing to which to loop
back.
10 RW/L 1'h0 Slave Output Enable
(SLV_OE)
Relevant only when the SPI
Controller is configured as a
serial-slave device. When
configured as a serial master,
this bit field has no
functionality. This bit enables
or disables the setting of the
ssi_oe_n output from the SPI
Controller serial slave. When
SLV_OE = 1, the ssi_oe_n
output can never be active.
When the ssi_oe_n output
controls the tri-state buffer
on the txd output from the
slave, a high impedance state
is always present on the
slave txd output when
SLV_OE = 1. This is useful
when the master transmits in
broadcast mode (master
transmits data to all slave
devices). Only one slave may
respond with data on the
master rxd line. This bit is
enabled after reset and must
be disabled by software
(when broadcast mode is
used), if you do not want this
device to respond with data.
0 - Slave txd is enabled
1 - Slave txd is disabled