DS90UH929-Q1 Datasheet, PDF (21/77 Pages) Texas Instruments – 720p HDMI to FPD-Link III Bridge Serializer with HDCP

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DS90UH929-Q1
SNLS458 – NOVEMBER 2014
Feature Description (continued)
8.3.13 Remote Interrupt Pin (REM_INTB)
REM_INTB will mirror the status of INTB_IN pin on the deserializer and does not need to be cleared. If the
serializer is not linked to the deserializer, REM_INTB will be high.
8.3.14 General-purpose I/O
8.3.14.1 GPIO[3:0] Configuration
In normal operation, GPIO[3:0] may be used as general purpose IOs in either forward channel (outputs) or back
channel (inputs) mode. GPIO modes may be configured from the registers. See Table 1 for GPIO enable and
configuration.
Description
GPIO3
GPIO2
GPIO1
GPIO0
Table 1. GPIO Enable and Configuration
Device
Serializer
Deserializer
Serializer
Deserializer
Serializer
Deserializer
Serializer
Deserializer
Forward Channel
0x0F[3:0] = 0x3
0x1F[3:0] = 0x5
0x0E[7:4] = 0x3
0x1E[7:4] = 0x5
0x0E[3:0] = 0x3
0x1E[3:0] = 0x5
0x0D[3:0] = 0x3
0x1D[3:0] = 0x5
Back Channel
0x0F[3:0] = 0x5
0x1F[3:0] = 0x3
0x0E[7:4] = 0x5
0x1E[7:4] = 0x3
0x0E[3:0] = 0x5
0x1E[3:0] = 0x3
0x0D[3:0] = 0x5
0x1D[3:0] = 0x3
8.3.14.2 GPIO_REG[8:5] Configuration
GPIO_REG[8:5] are register-only GPIOs and may be programmed as outputs or read as inputs through local
register bits only. Where applicable, these bits are shared with I2S pins and will override I2S input if enabled into
GPIO_REG mode. See Table 2 for GPIO enable and configuration.
Note: Local GPIO value may be configured and read either through local register access, or remote register
access through the Bidirectional Control Channel. Configuration and state of these pins are not transported from
serializer to deserializer as is the case for GPIO[3:0].
Description
GPIO_REG8
GPIO_REG7
GPIO_REG6
GPIO_REG5
GPIO3
Table 2. GPIO_REG and GPIO Local Enable and Configuration
Register Configuration
0x11[7:4] = 0x01
0x11[7:4] = 0x09
0x11[7:4] = 0x03
0x11[3:0] = 0x1
0x11[3:0] = 0x9
0x11[3:0] = 0x3
0x10[7:4] = 0x1
0x10[7:4] = 0x9
0x10[7:4] = 0x3
0x10[3:0] = 0x1
0x10[3:0] = 0x9
0x10[3:0] = 0x3
0x0F[3:0] = 0x1
0x0F[3:0] = 0x9
0x0F[3:0] = 0x3
Function
Output, L
Output, H
Input, Read: 0x1D[0]
Output, L
Output, H
Input, Read: 0x1C[7]
Output, L
Output, H
Input, Read: 0x1C[6]
Output, L
Output, H
Input, Read: 0x1C[5]
Output, L
Output, H
Input, Read: 0x1C[3]
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