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TDA19978BHV Datasheet(PDF) 10 Page - NXP Semiconductors |
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TDA19978BHV Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 38 page TDA19978B_2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 02 — 10 May 2010 10 of 38 NXP Semiconductors TDA19978B Quad HDMI 1.3a receiver with digital processing 8.4 Equalizer The auto-adaptive equalizer automatically measures and selects the settings which provide the best signal quality for each cable. This improves signal quality and enables the use of cable lengths up to 25 m (laboratory tested, contact NXP semiconductors for detailed information). The equalizer is fully automatic and consequently does not need any external control. 8.5 Activity detection The TDA19978B uses activity detection to automatically select the active HDMI input. An internal, fully programmable, frequency filter controls activity detection. It sees only the activity on the HDMI inputs with a frequency range between the minimal frequency (22.5 MHz) and the maximal frequency (205 MHz). This activity detection can generate an interrupt enabling users to manage each HDMI input. 8.6 Color depth unpacking In Deep Color mode, the TDA19978B receives several fragments of a pixel group at the HDMI link frequency. The color depth unpacking block translates the received pixel group into pixels at the pixel frequency. This operation is fully automatic and does not need any external control. 8.7 Derepeater The HDMI source uses pixel repetition to increase the transmitted pixel clock frequency for transmitting video formats at native pixel rates below 25 Mpixel/s or to increase the number of audio sample packets in each line. The derepeater function discards repeated pixels and divides the clock to reproduce the native video format. 8.8 Upsample The HDMI source can use YCbCr 4:2:2 pixel encoding which enables the number of bits allocated per component to be increased up to 12. The upsample function transforms this 12-bit YCbCr 4:2:2 data stream into a 12-bit YCbCr 4:4:4 data stream by repeating or linearly interpolating the chrominance pixels Cb and Cr. Upsampling mode is selected using the I2C-bus. 8.9 Packet extraction Information sent during the Data Island periods is extracted from the HDMI data stream. Audio clock regeneration, general control and InfoFrames can be read using the I2C-bus while audio samples are sent to the audio FIFO. The TDA19978B can receive HDMI 1.3a packets, general control and color gamut metadata packets. In audio applications, the TDA19978B manages HBR packets for high bit rate compressed audio streams (IEC 61937), OBA samples and DST packets for one bit audio and SACD with DSD and DST audio streams. |
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