STA450A datasheet(11/66 Pages) STMICROELECTRONICS

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STA450A

Figure 6. PCM Output Formats

1.4 Master Interface I2C

The I2C master interface is used by the STA450A to communicate with the external Conditional Access Pro-

cessor (CAP) with the following protocol:

a) Write sequences

1 6 sc lk cyc les

LR CLK

PC M_OU T[2:0]

PC M_OR D = 0, PC M_PR EC is 16 bits mode

LRC L K

PC M_OU T[2:0]

PC M_OR D = 1, PC M_PR EC is 16 bits mode

32 sc lk cy cles

3 2 sclk cycles

18 , 20 o r 24 b its

18, 2 0 or 24 bits

18, 20 o r 24 b its

18, 2 0 or 24 bits

1 8, 20 o r 24 b its

PC M _ FO RM AT = 1

PC M _ DIFF = 1

PC M _ FO RM AT = 0

PC M _ FO RM AT = 1

PC M _ DIFF = 0

PC M _ DIFF = 1

PC M _ DIFF = 0

MS B

STAR T

SLAVE ADD RESS

SUB-AD DRE SS @

DAT A TO @ SA ST OP

S UB-A D DR ES S + S ING LE W RITE

S UB-A D DR ES S IN ITIA LIZA T ION

W : R/W BIT = WR IT E

SA : SLAVE ACKNOWL ED GE

@ : SUB -AD DRE SS V AL UE

STAR T

SLAVE ADD RESS

SUB-AD DRE SS @

DAT A TO @ SA

SU B-AD D RES S + MU LTIP LE W RITE

D ATA TO @+1

DA TA TO @+2 SA

STO P

STAR T

SLAVE ADD RESS

SUB-AD DRE SS @

STO P

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