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TDA19977AHV データシート(PDF) 11 Page - NXP Semiconductors |
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TDA19977AHV データシート(HTML) 11 Page - NXP Semiconductors |
11 / 40 page TDA19977A_TDA19977B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 3 — 19 November 2010 11 of 40 NXP Semiconductors TDA19977A; TDA19977B Triple input HDMI receiver interface 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 for detailed information). The equalizer is fully automatic and consequently does not need any external control. 8.5 Activity detection The TDA19977A; TDA19977B 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 fmin (22.5 MHz) and fmax (205 MHz). This activity detection can generate an interrupt enabling users to manage each HDMI input. 8.6 High-bandwidth digital content protection (TDA19977A only) The HDMI receiver also contains the HDCP decryption function. The keys provided by the OTP non-volatile memory in encrypted format are decrypted and then stored in the HDCP module. This is particularly suitable for repeater applications. The TDA19977A manages all HDCP repeater functions based on the HDCP 1.4 specification. Three DDC-buses HSCLA/HSDAA; HSCLB/HSDAB and HSCLC/HSDAC are integrated into the HDCP function, one bus for each HDMI input. The DDC-bus connected to the HDCP block is automatically selected based on the active HDMI input. The unused inputs are disconnected from the DDC-bus (no acknowledge). No additional CPU processing is required because the authentication phase and the re-key calculation are fully managed by the TDA19977A. 8.7 Color depth unpacking In Deep Color mode, the TDA19977A; TDA19977B receives several fragments of a pixel group at the HDMI link frequency. This block translates the received pixel group into pixels at the pixel frequency. This operation is fully automatic and does not need any external control. 8.8 Derepeater The HDMI source uses pixel repetition to increase the transmitted pixel clock 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. 8.9 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. |
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