THOMSON 32E90NH22 - Embedded EDID Functionality; EDID Emulation Function

Silicon Image
Confidential for Philips
Consumer Electronics
Internal Use Only
SiI9185A 3:1 HDMI 1.3 Switch
Preliminary Data Sheet
Silicon Image, Inc.
Embedded EDID
The SiI9185A embeds 256 bytes of RAM for EDID and used to eliminate the discrete EEPROM EDID from the system.
SiI9185A
H
D
M
I
0
+5V
TMDS0
HPD0
DDC0
Micro-
Controller
SEL0
SEL1
SiI 9011/
SiI 9013/
SiI 9025/
SiI 9125
TMDS_Out
DDC_Out
HPDIN
TPWR
CEC_D
EDID
CSCL/
CSDA
H
D
M
I
1
+5V
TMDS1
HPD1
DDC1
CEC_A
H
D
M
I
2
+5V
TMDS2
HPD2
DDC2
Optional EDID to
support EDID different
from Port 0 and Port 1
Optional 5V
detection output
to Audio DAC
for muting
Select the input and control the SiI 9185
using either SEL 0/1 or the I
2
C interface
from the microcontroller
Figure 7. EDID in the SiI9185A
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 Length DDC I
2
C Slave
Address
Offset Address
Range
0 EDID 1.3 according to VESA 128 bytes 0xA0 0x00 – 0x7F
1
EDID extension according to the
CEA 861 specification
128 bytes 0xA0 0x80 – 0xFF
The host writes the desired information into the EDID memory through the local I
2
C interface.
12 © 2007 Silicon Image, Inc. CONFIDENTIAL SiI-DS-1016-0.80