EL4511 datasheet(21/24 Pages) RENESAS

21 / 24 page

EL4511

FN7009 Rev 8.00

Page 21 of 24

November 12, 2010

TABLE 3. MODE CONTROL TRUTH TABLE

(see also Table 2 for hardware over-ride)

MODE

CTRL

EnTri

Level

EnBi

Level

EnHin

Vin

TriLevel

Priority

Hin

Priority

HinVin

Only

Reg 1

b5 b4 b3

0 0 0

0 0 1

0 1 0

0 1 1

1 0 0

1 0 1

1 1 0

1 1 1

EnTriLevel, EnBiLevel and EnHinVin; these enable tri-level sync

detection, two-level sync detection and separate H/V (VGA) sync

detection, respectively.

Other signals used to prioritize tri-level syncs (TriLevPriority),

separate H/V (Hin Priority), or to only allow signals from

HIN/VERTIN (HinVinOnly).

TABLE 4. ACQUISITION CONTROL SIGNALS

BIT

SIGNAL

NAME

DESCRIPTION

En50Slice

1 = Sample and Hold front

end is in use

Progressive

1 = Progressive scan

detected

Tri-Level

Detected

1 = Tri-Level syncs detected

ENLEVEL

BLANKING

1 = VLEVEL is available

when system is not locked

ENLEVEL

1 = Disable VLEVEL Output

ENALOS

1 = Analog loss of signal not

used in lock indication.

SYNCLOCK Same information as

SYNCLOCK pin 3

RateLocked

Line rate is locked

ALOS

Sync Amplitude is below

minimum

TABLE 5. SERIAL INTERFACE REGISTER BIT ALLOCATIONS

NUMBER

BIT

SIGNAL NAME

TYPE

RESET

VALUE

DESCRIPTION AND COMMENTS

General Control Reg 1

R/W

00h

General Reset

Software reset. Does not affect serial interface.

AlwaysEnOutputs

Overrides internal qualification of outputs.

5:3

ModeCtrl

Sync acquisition. Selects input signal. See Table 3.

General Control Reg 2

R/W

10h

Select Fixed Slicing (no S/H)

Necessary for SECAM. May be useful for VCRs.

FILTER_ENABLED

Set Hi to include digital filter on horizontal input.

OE_MODE

Set Hi for Odd/Even changes on rising edge of vertical.

3VBLANK Control Reg 1

R/W

90h

EnVBlank

Enables vertical blank interval detection algorithm.

6:0

VSTPlusBP

10h

Number of lines after vertical sync time.

4VBLANK & Polarity Ctrl

R/W

4Fh

7:4

VFrontPorch

Number of lines before vertical sync time.

DefaultHPolarity

HIN polarity on reset if EnHpolarityDet = Lo.

DefaultVPolarity

VERTIN polarity on reset and if EnVpolarityDet = Lo.

EnHPolarityDet

Allows EL4511 to detect and set polarity on HIN.

EnVPolarityDet

Allows EL4511 to detect and set polarity on VERTIN.

Oscillator Control 2

R/W

22h

7:6

CMuxCtrl <1:0>

Multiplexes clock onto VBLANK or Odd/Even. See Table 1.

7VBLANK O/P Reg 1

Only valid if VBLANK circuit is enabled

7:0

LinesPerFrame <7:0>

Least significant byte of lines per frame count.

8VBLANK O/P Reg 2 & Misc

80h

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