IT66121FN View Datasheet(PDF) - ITE Tech. INC.
Part Name
Description
Manufacturer
IT66121FN Datasheet PDF : 39 Pages
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IT66121FN
Configuration and Function Control
IT66121 includes two serial programming ports by default (i.e. with embedded HDCP keys): one for
interfacing with micro-controller, the other for accessing the DDC channels of HDMI link.
The serial programming interface for interfacing the micro-controller is a slave interface, comprising
PCSCL (Pin 12) and PCSDA (Pin 11). The micro-controller uses this interface to monitor all the
statuses and control all the functions. Two device addresses are available, depending on the input
logic level of PCADR (Pin 32). If PCADR is pulled high by the user, the device address is 0x9A. If
pulled low, 0x98.
The I2C interface for accessing the DDC channels of the HDMI link is a master interface, comprising
DDCSCL (Pin 16) and DDCSDA (Pin 15). IT66121 uses this interface to read the EDID data and
perform HDCP authentication protocol with the sink device over the HDMI cable.
For temporarily storing the acquired EDID data, IT66121 includes a 32 bytes dedicated FIFO. The
micro-controller may command IT66121 to acquire 32 bytes of EDID information, read it back and then
continue to read the next 32 bytes until getting all necessary EDID information.
The HDCP protocol of IT66121 is completely implemented in hardware. No software intervention is
needed except for revocation list checking. Various HDCP-related statuses are stored in HDCP
registers for the reference of micro-controller. Refer to IT66121 Programming Guide for detailed
register descriptions. The HDCP Standard also specifies a special message read protocol other than
the standard I2C protocol. See Figure 4 for checking HDCP port link integrity.
S Slave Addr (7) R A Read Data (8) A Read Data (8) A Read Data (8) NA P
S=Start; R=Read; A=Ack; NA=No Ack; P=Stop
Figure 4. HDCP port link integrity message read
All serial programming interfaces conform to standard I2C transactions and operate at up to 100kHz.
www.ite.com.tw
Nov-2011 Rev:0.99 12/39
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