Cirrus-logic CS5464 Manuel d'utilisateur télécharger pdf (Page 18)

CS5464

18 DS682F3

5.2.5 Serial Interface

The CS5464 provides 5 pins, SCLK, SDI, SDO, CS, and

MODE for communication between a host microcon-

troller or serial E

PROM and the CS5464.

MODE is an input that, when high, indicates to the

CS5464 that a serial E

PROM is being used instead of

a host microcontroller. It has a weak pull-down allowing

it to be left unconnected if microcontroller mode is used.

SCLK is used to shift and qualify serial data. Serial data

changes as a result of the falling edge of SCLK and is

valid during the rising edge. It is a Schmitt-trigger input

for host microcontrollers, and a driven output for serial

PROMs.

SDI is the serial data input to the CS5464.

SDO is the serial data output from the CS5464. It’s out-

put drivers are disabled whenever CS

is de-asserted, al-

lowing other devices to drive the SDO line.

is the chip select input for the serial bus. A high logic

level de-asserts it, tri-stating the SDO pin and clearing

the serial interface. A low logic level enables the serial

port. This pin may be tied low for systems not requiring

multiple SDO drivers. CS

is a driven output when inter-

facing to serial E

PROMs.

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Cirrus-logic CS5464 Manuel d'utilisateur Page 18