TDA19989AET datasheet(23/47 Pages) NXP

부품명	TDA19989AET

상세설명	150 MHz pixel rate HDMI 1.3 transmitter with 3 횞 8-bit video inputs, HDCP and CEC support

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23 / 47 page

TDA19989_1

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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