PS176 DisplayPort
TM
-to-HDMI 2.0 Protocol Converter
For Customer Internal Use Only
7
TEL: 408-329-5540
FAX: 408-329-5541
Email: Sales@paradetech.com
Parade Technologies Inc.
actions after the HDMI_HPD state change. HDMI_HPD state changes are mainly used in the PS176
operation and power state machine maintained by PS176 firmware.
DP_HPD
DP_HPD is an output signal. A HIGH on this signal indicates that PS176 is ready to take DisplayPort™
input. Firmware will control this signal according to PS176 operation and power state machine.
After power on, DP_HPD signal will stay at low. Once PS176 is ready to take DisplayPort™ input, this
signal will be asserted HIGH.
In addition to hot plug detection, DP_HPD signal is also used for the following:
DisplayPort™ IRQ, including Link Status change, AUTOMATED_TEST_REQUEST and CP_IRQ.
In these events, hardware will generate short low-going pulse (0.5ms ~ 1ms) on DP_HPD pin
DisplayPort™ MCCS_IRQ and SINK_SPECIFIC_IRQ. Firmware will generate short low-going
pulse (0.5ms ~ 1ms) in the two events
AUX TO I2C BRIDGE
AUX to I2C bridge acts as a bidirectional repeater function from DisplayPort™ AUX CH interface to HDMI
DDC interface. It monitors DisplayPort™ AUX CH traffic and converts only those I2C-over-AUX CH
transactions targeted to the HDMI sink device, as described below, into HDMI DDC interface.
EDID access: I2C slave address of 60h, 61h, A0h and A1h
MCCS communication: I2C slave address of 6Eh and 6Fh
VESA DisplayID standard (proposed and legacy): I2C slave address of A0h through A7h
All other I2C-over-AUX transactions are blocked and assumed to be accessing functions within the PS176.
The AUX to I2C bridge provides an interface for PS176 firmware to interface AUX CH directly. This is to
provide hardware support for firmware to handle all possible native AUX transactions and I2C-over-AUX
transactions, including those targeted to the HDMI sink device.
The AUX to I2C bridge also provides an interface for PS176 to directly access HDMI DDC port. This
function will be used when firmware needs to read EDID from downstream device, or to read downstream
HDCP port directly.
Parade Confidential:
For VIA Internal Use Only
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