Embedded Edid; Edid Emulation Function; Edid In The Sii9185A; Layout Of The Edid Blocks - THOMSON 22E92NH22 Service Manual

SiI9185A 3:1 HDMI 1.3 Switch
Preliminary Data Sheet

Embedded EDID

The SiI9185A embeds 256 bytes of RAM for EDID and used to eliminate the discrete EEPROM EDID from the system.
H
+5V
D
TMDS 0
M
HPD0
I
DDC0
0
CEC_A
H
+5V
D
TMDS 1
M
HPD1
I
DDC1
1
H
+5V
D
TMDS2
M
HPD2
I
DDC2
2

EDID Emulation Function

All of the HDMI input ports have a DDC interface consisting of DSDA# and DSCL# where # is the port number. The
SiI9185A device incorporates the function of an HDMI 1.3 compliant EDID in internal registers. The first block must
conform to the VESA EDID specification. The second block must conform to the CEA-861D specification.
The SiI9185A supports two blocks of EDID, each 128 bytes long. Table 4 shows the layout of the EDID block as it
appears to each of the DDC interface controllers.
Table 4. Layout of the EDID Blocks
Block # Description
0 EDID 1.3 according to VESA
1
EDID extension according to the
CEA 861 specification
The host writes the desired information into the EDID memory through the local I
12
Select the input and control the SiI 9185
using either SEL 0/1 or the I
from the microcontroller
SiI9185A
Optional EDID to
EDID
support EDID different
from Port 0 and Port 1
Figure 7. EDID in the SiI9185A
Length
128 bytes
128 bytes
© 2007 Silicon Image, Inc. CONFIDENTIAL
2
C interface
CEC_D
Micro-
SEL 0
Controller
SEL 1
CSCL/
CSDA
TPWR
SiI 9011/
TMDS _Out
SiI 9013/
HPDIN
SiI 9025/
DDC_Out
SiI 9125
2
DDC I C Slave Offset Address
Address Range
0xA0 0x00 – 0x7F
0xA0 0x80 – 0xFF
2
C interface.
Silicon Image, Inc.
Optional 5V
detection output
to Audio DAC
for muting
SiI-DS-1016-0.80