STA016 datasheet(4/43 Pages) STMICROELECTRONICS

4 / 43 page

STA016A

4/43

Figure 4. Layers performed by embedded DSP firmware

The whole CDROM and file-system decoding task is performed by embedded firmware. The application MCU,

basically, must manage CDDSP device according to STA016A requests. Three basic command flows exist:

■

MCU -> STA016A: commands used to handle decoder operation and to ask for specific information like

filename, filelength, sector raw data, etc. This flow will use I2C (GPSO for special operations) interface.

■

STA016A -> MCU: this channel is used to retrieve inquired information and to inform MCU that a

CDDSP specific operation must be performed (like pick-up repositioning). This flow is based on I2C link

plus an additional interrupt signal in order to avoid time consuming polling techniques.

■

MCU -> CDDSP: the CDDSP management is fully up to the application MCU. This architecture allows

maximum flexibility and easy migration from existing CDPlayers to MP3 CDPlayers.

Figure 5. PIN CONNECTION

FRAMES to SECTOR TRANSLATOR

SYNC DETECTOR

DESCRAMBLER

EDC/ECC (C3)

ISO9660 File System Decoding

(with Joliet support)

Browsing Command Interface

28 29 30 31 32

59 58 57 56

53 52 51 50 49

VSS_1

VDD_1

DREQ

CD_BCK

CD_LRCK

CD_SDI

VSS_2

VDD_2

BS_SDI

BS_LRCK

BS_BCK

VSS_6

VCC_2

PLL_GND

PLL_VCC

FILT1

FILT0

IODATA12

IODATA11

IODATA10

IODATA8

IODATA9

D00AU1227

22 23 24 25 26

17 18 19 20 21

VSS_5

VDD_4

IODATA6

IODATA5

IODATA7

TESTEN

RESET

SDI

LRCK1

BCKI

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