MFC2000 datasheet(189/426 Pages) ETC

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Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

7-41

7.2

Serial Programming Interface

The serial programming interface is a two-wire bidirectional serial bus, which provides a simple and efficient way

for data exchange between devices.

Main Features:

•

Only two bus lines are required; a serial interface data (SID) and a serial interface clock (SIC)

•

Master–transmitter & master–receiver

•

Schmitt trigger on SID input

•

Synchronization capability (allowing slave to add wait state by pulling the clock low)

•

Optional interrupt or polling operation

•

Optional firmware operation for manual control of the SPI bus

•

Soft reset

7.2.1

Function Description

Physical Connection

MFC2K (Master)

Slave

SID_n out

SIC in

SID in

SIC_n out

SID_n out

SIC in

SID in

SID

(serial interface data)

SIC

(serial interface clock)

SIC_n out

PM[0]/GPO[0]/ SPI_SID /EADC_D[9]/T_EXT_BREQ

PM[1]/GPO[1]/ SPI_SIC /EADC_D[8]/T_EXT_BACK

Figure 7-23. Serial Programming Interface, Physical Connection

Notes:

Master is the device that initiates a transaction, generates clock signal, and terminates the

transaction.

Data and clock can only be driven low, and cannot be driven high. The pull-up resistors are

responsible to create a logic 1. This configuration forms wire – AND connection.

Slave can only drive the clock signal to add wait state.

There is no minimum requirement for clock frequency.

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