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TDA19989AET 데이터시트(PDF) 23 Page - NXP Semiconductors |
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TDA19989AET 데이터시트(HTML) 23 Page - NXP Semiconductors |
23 / 47 page TDA19989_1 © NXP B.V. 2010. All rights reserved. Preliminary data sheet Rev. 01 — 15 February 2010 23 of 47 NXP Semiconductors TDA19989 HDMI 1.3 transmitter with HDCP and CEC support 7.10 Interrupt controller Pin INT is used to alert the system microcontroller that a critical event concerning the HDMI or CEC has occurred. The software provided with the device read a status register (I2C-bus) to determine which block between HDMI and CEC has caused the interruption before processing it. Some of theses interrupts are maskable. The interrupt types are described in Table 18. 7.10.1 Hot plug/unplug detect The hot plug detect (HPD) pin is 5 V input tolerant. The HPD signal, when asserted, tells the transmitter that the receiver is connected. When changing from LOW-to-HIGH, TDA19989 has to read the EDID of the receiver in order to select the video format that the receiver can handle. 7.10.2 Receiver sensitivity TDA19989 has the capability to sense the receiver connectivity and working behavior. This feature (RxSense) detects the presence of the 50 Ω pull-up resistor R T on the TMDS clock channel of the downstream side. Table 18. Interruptions Interrupt domain Interrupt name Definition Maskable feature HDCP r0 r0 = R’0 check done maskable pj pj = P’j check fails sha-1 V = V’ check success bstatus bstatus available bcaps bcaps available t0 HDCP goes to initial state security HDCP encryption is off or blue screen removed not maskable HPD hpd transition on HPD input maskable RxSense rx_sense transition on RxSense maskable Interrupt sw_intsoftware test purpose (output an interrupt signal) maskable EDID edid_block_rd EDID block read finished maskable CEC cec_int CEC message received not maskable |
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