STV9425-STV9425B Ver la hoja de datos (PDF) - STMicroelectronics

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STV9425-STV9425B

MULTISYNC ON-SCREEN DISPLAY FOR MONITOR

STMicroelectronics 

STV9425 - STV9425B - STV9426

FUNCTIONAL DESCRIPTION (continued)

I.3 - Addressing Space

STV9425/25B/26 registers, RAM and ROM are

mapped in a 16Kbytes addressing space. The

mapping is the following :

0000

03FF

0400

1FFF

2000

32FF

3300

3FFF

3FF0

3FFF

1024 bytes RAM

Descriptors character

codes user definable

characters

Empty Space

Character

Generator ROM

Empty Space

Internal

Registers

I.4 - Register Set

LINE DURATION

3FF0 VSP HSP LD5 LD4 LD3 LD2 LD1 LD0

*

0 0 111111

VSP : V-SYNC active edge selection

= 0 : falling egde, = 1 : rising edge

HSP : H-SYNC active edge selection

= 0 : falling egde, = 1 : rising edge

LD[5:0] : LINE DURATION

(number of pixel period per line divided

by 12 ie. Unit = 12 pixel periods).

HORIZONTAL DELAY

3FF1 DD7 DD6 DD5 DD4 DD3 DD2 DD1 DD0

* 00 0 01 00 0

DD[7:0] : HORIZONTAL DISPLAY DELAY from

the H-SYNC reference falling edge to

the 1st pixel position of the character

strips. Unit = 3 pixel periods.

CHARACTERS HEIGHT

3FF2 -

*-

- CH5 CH4 CH3 CH2 CH1 CH0

-0 1 00 1 0

CH[5:0] : HEIGHT of the character strips in scan

lines. For each scan line, the number of

the slice which is displayed is given by :

SLICE-NUMBER =

round

SCAN





−LINE−NUMBER

CH[5:0]

x

18.



SCAN-LINE-NUMBER = Number of the

current scan line of the strip.

DISPLAY CONTROL

3FF3 OSD FBK FL1 FL0 - P8 P7 P6

*

0 0 0 0 - 000

OSD : ON/OFF (if 0, R, G, B and FBLK are 0).

FBK : Fast blanking control :

= 1 : FBLK = 1, forcing black where these

is no display,

= 0 : FBLK is active only during character

display.

FL[1:0] : Flashing mode :

- 00 : No flashing. The character

attribute is ignored,

- 01 : 1/1 flashing (a duty cycle = 50%),

- 10 : 1/3 flashing,

- 11 : 3/1 flashing.

P[8:6] : Address of the 1st descriptor of the

current displayed pages.

P[13:9] and P[5:0] = 0 ; up to 8 different

pages can be stored in the RAM.

LOCKING CONDITION TIME CONSTANT

3FF4 FR AS2 AS1 AS0 - BS2 BS1 BS0

* 00 1 0 -0 1 0

FR : Free Running ; if = 1 PLL is disabled and

the pixel frequency keeps its last value.

AS[2:0] : P h a s e c o n s t ant du rin g lo ck ing

conditions.

BS[2:0] : Frequency constant during locking

conditions.

CAPTURE PROCESS TIME CONSTANT

3FF5 - AF2 AF1 AF0 - BF2 BF1 BF0

* -011-01 1

AF[2:0] : Phase constant during the capture

process.

BF[2:0] : Frequency constant during the capture

process.

INITIAL PIXEL PERIOD

3FF6 PP7 PP6 PP5 PP4 PP3 PP2 PP1 PP0

* 00101000

PP[7:0] : Value to initialize the pixel period of the

PLL.

FREQUENCY MULTIPLIER

3FF7 - - - - FM3 FM2 FM1 FM0

* ----1010

FM[3:0] : Frequency multiplier of the crystal

frequency to reach the high frequency

used by the PLL to derive the pixel

frequency.

7/15

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