STA016T datasheet(41/45 Pages) STMICROELECTRONICS

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STA016T

COMMAND PROTOCOL CONFIGURATION

General Information About The Command Protocol

I2C protocol :

CD_module & mmdsp are using an I2C protocol to communicate : CD_module is master of the I2C protocol,

and can access (in read and write mode) host registers of the sta016 to write commands to the mmdsp and to

read request from the mmdsp. It must use following I2C syntax :

device_address, host_register_number, host_register_value

where :

for a write acces, device_address is 0x86.

for a read acces, device_address is 0x87.

Writing a command to mmdsp :

CD_module write its command inside dedicated host registers (mainly H64 to H69), then it must signals the writ-

ing of this command to mmdsp by sending the interrupt IT_CMD to the core of mmdsp.

Note that IT_CMD is generated by cd_module threw a falling edge on the input line number 0 of the sta016 (the

INTLINE[0] pin).

Reading a request from mmdsp :

MMDSP write its request inside dedicated host registers (mainly H70 to H78 and H134 to H169), then it signals

to cd_module that it must read a request by sending the interrupt IT_REQ.

Note that IT_REQ interrupt is generated by mmdsp on the IRQB pin of sta016.

Note also that once it has finished to read the message, cd_module must always acknowledge it by reading

H10.

STA016T Datasheet(PDF) 41 Page - STMicroelectronics