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参数资料
型号： ST72E734J6D0
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP42
封装： CERAMIC, SDIP-42
文件页数： 140/144页
文件大小： 1280K
代理商： ST72E734J6D0
ST72774/ST727754/ST72734
95/144
4.8 DDC INTERFACE (DDC)
4.8.1 Introduction
The DDC (Display Data Channel) Bus Interface is
mainly used by the monitor to identify itself to the
video controller, by the monitor manufacturer to
perform factory alignment, and by the user to
adjust the monitor’s parameters.
The DDC interface consists of two parts:
s
A
fully
hardware-implemented
interface,
supporting
DDC1
and
DDC2B
(VESA
specification 3.0 compliant). It accesses the
ST7 on-chip memory directly through a built-in
DMA engine.
s
A second interface, supporting the slave I2C
functions for handling DDC/CI mode (DDC2Bi),
factory alignment or Enhanced DDC (EDDC) by
software.
4.8.2 DDC Interface Features
4.8.2.1 Hardware DDC1/2B Interface Features
s
Full
hardware
support
for
DDC1/2B
communications (VESA specification versions 2
and 3)
s
Hardware detection of DDC2B addresses A0h/
A1h and optionally A2h/A3h (P&D) or A6h/A7h
(FPDI-2)
s
Separate mapping of EDID version 1 (128
bytes) and EDID version 2 (256 bytes) when
both must coexist
s
Support for error recovery mechanism
s
Detection
of
misplaced
Start
and
Stop
conditions
s
I2C byte, random and sequential read modes
s
DMA transfer from any memory location and to
RAM
s
Automatic memory address incrementation
s
End of data downloading flag and interrupt
capability
4.8.2.2 DDC/CI - Factory Interface Features
General I2C Features:
– Parallel bus /I2C protocol converter
– Interrupt generation
– Standard I2C mode/Fast I2C mode
– 7-bit Addressing
I2C Slave Features:
–I2C bus busy flag
– Start bit detection flag
– Detection of misplaced Start or Stop condition
– Transfer problem detection
– Address Matched detection
– Programmable
Address
detection
and/or
Hardware detection of Enhanced DDC (ED-
DC) addresses (60h/61h)
– End of byte transmission flag
– Transmitter/Receiver flag
– Stop condition Detection
Figure 56. DDC Interface Overview
SDAD
SCLD
VSYNCI
SDA
SCL
VSYNC
HARDWARE DDC1/2B
INTERFACE
I2C SLAVE
INTERFACE
(DDC/CI - Factory Alignment)
VSYNCI2
VSYNC2
相关PDF资料
PDF描述
ST72T774S9T1 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
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ST72T94C6M6 8-BIT, OTPROM, MICROCONTROLLER, PDSO28
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