ST92185B datasheet(140/178 Pages) STMICROELECTRONICS

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ST92185B - SYNC CONTROLLER

SYNC CONTROLLER (Cont’d)

7.5.5 Register Description

SYNC CONTROLLER CONTROL AND STATUS

R242 - Read/Write

Reset value: 0000 0000 (00h)

Bit 7= VPOL.

VSYNC Polarity

When MOD[1:0] are reset, this bit configures the

polarity of the VSYNC input.

0: Negative polarity (leading edge is falling edge)

1: Positive polarity (leading edge is rising edge)

For other cases:

Bit 6= HPOL.

HSYNC/CSYNC Polarity.

0: Negative polarity (leading edge is falling edge)

1: Positive polarity (leading edge is rising edge)

Bit 5= VSEP.

Separate Sync

When MOD[1:0] are reset:

0: The standard mode using two inputs (VSYNC

and HSYNC) is activated.

1: The Composite Sync mode is activated; the

HSYNC/CSYNC input will be used to get both H

and V signals.

For other cases:

Bit 4= VDLY.

Vertical Delay control bit.

This bit is active only if the Composite Sync mode

is enabled. The selection of this bit can effect

noise margin (longer delay is better) and the field

detection.

0: Vertical is generated after detecting a pulse

greater than 16µs

1: Vertical is generated after detecting a pulse

greater than 32µs

Bit 3:0= HSF.

Horizontal Shift for Field detection.

These 4 bits program the delay, in steps of 4µs,

applied to the HSYNC pulse in order to properly

determine the field information by comparison with

VSYNC. This value is a chassis constant depend-

ing upon the way the separate H/V signals are

generated.

VPOL

HPOL

VSEP

VDLY

HSF3

HSF2

HSF1

HSF0

MOD1

MOD0 VPOL

VSYNC polarity control

interlaced

non-interlaced

interlaced

non-interlaced

MOD1

MOD0

VSEP

CSO alternate function

disabled

enabled

disabled

enabled

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