STA450A datasheet(36/66 Pages) STMICROELECTRONICS

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STA450A

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3.3.8

DATAPORT_CH_FREQUENCY

3.3.9

SERVICE_CHECK

BYTE

FIELD

VALUE

DESCRIPTION

DP_CF_REQ

0x07

Data port change frequency Request

header

Data port frequency divider

Max. 0x05 – 12 Mhz

Default 0x1E – 2 Mhz

Min. 0x3C – 1Mhz

System clock divider.

E.g. Divider = 0x1E (30)

DpClk = (SysClk / 12);

DpClk = (60 Mhz / 12) = 2 Mhz

BYTE

FIELD

VALUE

DESCRIPTION

DP_CF_CFM

0x87

Data port change frequency confirmation

BYTE

FIELD

VALUE

DESCRIPTION

SERVICE_CHECK_REQ

0x10

Service Check Request header

Sid

1-255

Service identifier

extract_type

0x00 – Audio

0x01 – Data

Service type to extract. MMI can extract the

audio or data service component.

BYTE

FIELD

VALUE

DESCRIPTION

SERVICE_CHECK_CFM

0x90

Service Check Confirm header

service_check_status

bit 7 – Service Present

0x80 – SID_PRESENT

0x00 – SID_ABSENT

bit 6 – PC Format

0x40 – PC_STANDARD

0x00 – PC_NONSTANDARD

bit 5 – Service On-Air

0x20 – SERVICE_ONAIR

0x00 – SERVICE_OFFAIR

bit 4 – Service Type

0x10 – TYPE_PRESENT

0x00 – TYPE_ABSENT

bit 3 – Service Free

0x08 – SERVICE_FREE

0x00 – SERVICE_NOTFREE

bit 2 – Activation

0x04 – ACT_PRESENT

0x00 – ACT_ABSENT

bit 1 – Authorization

0x02 – AUTH_PRESENT

0x00 – AUTH_ABSENT

b0 – Reserved

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

channel_number

1 – 255

channel number for the service

3,4,5,6

crw

Channel Reference Word

Reference: Service Layer

Specification.

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