ST6387 datasheet(76/84 Pages) STMICROELECTRONICS

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ST63E85, T85 ST63E87, T87

1.3 EPROM/OTP DESCRIPTION

The ST63E8x is the EPROM version of the

ST636x, 7x, 8x ROM products. They are intended

for use during the development of an application,

and for pre-production and small volume produc-

tion. The ST63T8x OTP have the same character-

istics. They both include EPROM memory instead

of the ROM memory of the ST638x, and so the

program and constants of the program can be eas-

ily modified by the user with the ST63E8x EPROM

programming board from SGS-THOMSON.

The ROM mask options of the ST638x for OSD

polarities (HSYNC, VSYNC, R, G, B, BLANK) are

emulated with an EPROM OPTION BYTE. This is

programmed by the EPROM programming board

and its associated software.

The EPROM Option Byte content will define the

OSD options as follows:

b7-3: Device specific bits, these reserved bits

must be programmed with “00010”.

OPT 0: This bit defines the OSD H/Vsync polarity,

if 0 the polarity will be negative if 1 the polarity will

be positive.

OPT 1: This bit defines the RGB polarity, if 0 the po-

larity will be negative if 1 the polarity will be positive.

OPT 2: This bit defines the BLANK polarity, if 0 the

polarity will be negative if 1 the polarity will be pos-

itive.

From a user point of view (with the following ex-

ceptions) the ST63E8x,T8x products have exactly

the same software and hardware features of the

ROM version. An additional mode is used to con-

figure the part for programming of the EPROM,

this is set by a +12.5V voltage applied to the

TEST/VPP

pin.

The

programming

the

ST63E8x,T8x is described in the User Manual of

the EPROM Programming board.

On the ST63E8x, all the 20140 bytes of PRO-

GRAM memory are available for the user, as all

the EPROM memory can be erased by exposure

to UV light. On the ST63T8x (OTP device) a re-

served area for test purposes exists, as for the

ST638x ROM device. In order to avoid any dis-

crepancy between program functionality when us-

ing the EPROM, OTP and ROM it is recommend-

ed NOT TO USE THESE RESERVED AREAS,

even when using the ST63E8x. The Table 4 on

page 10 is a summary of the EPROM/ROM Map

and its reserved area.

1.4 POWER ON RESET

This feature is not available on the ST63E8x, T8x.

It is recommended to use the following application

schematics:

Figure 4. Reset Network

This application schematics can also be used for

the ROM devices.

THE READER IS ASKED TO REFER TO THE

DATASHEET OF THE ST636x, 7x, 8x ROM-

BASED DEVICE FOR FURTHER DETAILS.

1.5 EPROM ERASING

The EPROM of the windowed package of the

ST63E8x may be erased by exposure to Ultra Vio-

let light.

The

erasure

characteristic

the

ST63E8x

EPROM is such that erasure begins when the

memory is exposed to light with wave lengths

shorter than approximately 4000Å. It should be

noted that sunlight and some types of fluorescent

lamps have wavelengths in the range 3000-

4000Å. It is thus recommended that the window of

the ST63E8x package be covered by an opaque

label to prevent unintentional erasure problems

when testing the application in such an environ-

ment.The recommended erasure procedure of the

ST63E8x EPROM is exposure to short wave ultra-

violet light which has wavelength 2537Å. The inte-

grated dose (i.e. UV intensity x exposure time) for

erasure should be a minimum of 15 W-sec/cm2.

The erasure time with this dosage is approximate-

ly 15 to 20 minutes using an ultraviolet lamp with

12000mW/cm2

power

rating.

The

ST63E8x

should be placed within 2.5cm (1 inch) of the lamp

tubes during erasure.

Opt 2

Opt 1

Opt 0

Reset Pin

VDD

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