STA450A datasheet(33/66 Pages) STMICROELECTRONICS

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STA450A

3.3 DSP COMMAND DESCRIPTION

The commands are composed by two parts: the REQ one (request) and the CFM one (confirmation).

The REQ has to be written in the Command registers (0x6D - 0x7E); the CFM has to be read in the Data Page

registers (0x80 - 0xFF).

After a REQ has been issued the STA450A replies with a CFM within 5 MFP (5 x 432ms).

3.3.1

DSP_PWRUP_REQ

Command

OpCode

Category

Description

DISPLAY_MASK_REQ

0x4C

SERVICE

This command must be issued before power up

SDEC_VER_REQ

0x4D

SERVICE

This command must be issued before power up

The system controller can selected the version of the

SDEC

FAST_CLEAR_EVENT

0x50

FASTR

Clear events and error bit according to applied mask

FAST_DISABLE_REQ

0x51

FASTR

Clear events and error interrupt enable bit according to

applied mask

FAST_ENABLE _REQ

0x52

FASTR

Set events and errors interrupt enable bits according

to applied mask

FAST_EXTRACT_REQ

0x53

FASTR

Service extract in fast mode

BYTE

FIELD

VALUE

DESCRIPTION

DSP_PWRUP_REQ

0x00

DSP Initialization Request header

serv_label_size

8, 12, 16

Display size for the service label.

gen_label_size

8, 12, 16

Display size for the song label, artist

label, and program label.

BYTE

FIELD

VALUE

DESCRIPTION

DSP_ PWRUP _CFM

0x80

DSP Initialization Confirm header

error_code

0x00 – NO ERROR

0x01 – CAP_IO_ERROR

0x02 – INVALID_NVM_IMAGE

DSP power up error status

init_complete_status

0x04 – ACT_PRESENT

0x00 – ACT_ABSENT

Activation Status

If both encryption keys are stored in

memory, then DSP reports

ACT_PRESENT. If no encryption keys

are stored in memory, then DSP reports

ACT_ABSENT.

last_ear

0 – 3

Last saved Entered Authorization Rating

(EAR)

dsp_sw_version

0x00 – 0xFF

DSP software version

5 – 8

dsp_sw_date

Byte 5: month in BCD.

Byte 6: day in BCD.

Bytes 7,8: Year in BCD.

DSP release date.

The bits are ordered from left to right.

The MSB is on the left and the LSB is on

the right.

b7, b6, b5, b4, b3, b2, b1, b0

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