TMC2192 datasheet(27/69 Pages) CADEKA

27 / 69 page

PRODUCT SPECIFICATION

TMC2192

REV. 1.0.0 8/13/03

Ancillary frequency data is used to program the 32 bits of the

FREQ3-0 registers. ANCFREN and FRV determine how

ancillary frequency data is used. When ancillary data is not

present, the TMC2192 assumes FRV = LOW.

Note:

1. The F bit is part of the EAV timing reference code and tracks the F0 bit.

Operating Modes

The ﬁeld number bits (F2-0) from the ancillary data packet

FIELD word, are used to program the encoder’s ﬁeld counter

depending upon the state of the synchronous video ﬂag

(SVF) and the ANCTREN bit in the control register.

In the basic operating mode (ANCTREN = LOW), all timing

is found in the F bit of EAV. F2-0 and SVF are ignored and

the encoder subcarrier synthesizer is reset to the PHASE

value every eight ﬁelds (when the ﬁeld counter transitions

from 111 (ﬁeld 8) to 000 (ﬁeld 1).

In the basic mode, ANCFREN and ANCPHEN are typically

set LOW, ignoring ancillary frequency and phase data. If

ANCFREN and ANCPHEN are HIGH, the TMC2192 uses

the incoming ancillary frequency and phase data on a line-

by-line basis.

In genlocking mode (ANCTREN and SVF = HIGH), the

subcarrier synthesizer is allowed to free run, with phase and

frequency being set from the ancillary data packet PH12-0

and FR31-0 data. The ﬁeld counter increments just like it

does in basic mode.

Field sequence mode (ANCTREN = HIGH and SVF =

LOW), is the same as basic mode except that the ﬁeld

counter is set by the F2-0 bits in the FIELD word of ancillary

data. If ancillary data is not present on a line, the ﬁeld

counter will continue to count as it does in basic mode.

When ancillary data is present, the contents of the ﬁeld

counter are loaded with ﬁeld data (F2-0). In this way, the

TMC2192 may be synchronized with an external source by

sending ﬁeld data only once.

Table 15. Ancillary Data Control – Phase

ANCPHEN

PHV

Description

Ignore ancillary phase data,

set PHASE = 0

Ignore ancillary phase data,

no change to PHASE

Load ancillary phase data into

PHASE registers

Table 16. Ancillary Data Control Frequency

ANCFREN

FRV

Description

Ignore ancillary frequency

data

Ignore ancillary frequency

data

Load ancillary frequency data

into FREQ3-0 registers

Table 17. Field Identiﬁcation and Subcarrier Reset Modes

ANCTREN

SVF

F (EAV)

Field ID / Subcarrier Reset Mode

Basic Mode

xxxx

Odd ﬁeld, reset subcarrier every 8 ﬁelds

xxxx

Even field

Genlocking Mode

Odd ﬁeld, subcarrier free run

xxx

Even ﬁeld

Field Sequence Mode

0000

Field 1, reset subcarrier at field 1

0001

Field 2

0010

Field 3

0011

Field 4

0100

Field 5

0101

Field 6

0110

Field 7

0111

Field 8

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