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UPSD325X Datasheet(PDF) 87 Page - STMicroelectronics

Part # UPSD325X
Description  Flash Programmable System Devices with 8032 Microcontroller Core and 256Kbit SRAM
PDF  176 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UPSD325X Datasheet(HTML) 87 Page - STMicroelectronics

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µPSD325X DEVICES
Host Type Detection
The detection procedure conforms to the se-
quences proposed by VESA Monitor Display Data
Channel (DDC) specification. The monitor needs
to determine the type of host system:
s
DDC1 or OLD type host.
s
DDC2B host (Host is master, monitor is always
slave)
s
DDC2B+/DDC2AB(ACCESS.bus) host.
Figure 41. Host Type Detection
AI06644
Is VSYNC present?
Has a command
been received?
Is 2B+/A.B
command detected?
Is
DDC2B+/DDC2AB?
Is it DDC2B
command?
Power on
Communication
isidle
EDID sent continously using
VSYNC as clock
Is DDC2 clock
present?
Stop sending of EDID
switch to DDC2
communication mode
DDC2 communication
is idle.
Respond to
DDC2B command
Respond to DDC2B+/
DDC2AB command



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