DS90UB926Q Datasheet, PDF (24/57 Pages) Texas Instruments – 5 - 85 MHz 24-bit Color FPD-Link III Deserializer with Bidirectional Control Channel

DS90UB926Q
GPIO[3:0] and GPO_REG[8:4]
In 18-bit RGB operation mode, the optional R[1:0] and G[1:0] of the DS90UB926Q can be used as the general purpose IOs GPIO
[3:0] in either forward channel (Outputs) or back channel (Inputs) application.
GPIO[3:0] Enable Sequence
See Table 6 for the GPIO enable sequencing.
Step 1: Enable the 18-bit mode either through the configuration register bit Table 9 on DS90UB925Q only. DS90UB926Q is
automatically configured as in the 18-bit mode.
Step 2: To enable GPIO3 forward channel, write 0x03 to address 0x0F on DS90UB925Q, then write 0x05 to address 0x1F on
DS90UB926Q.
TABLE 6. GPIO Enable Sequencing Table
#
Description
1
Enable 18-bit
mode
2
GPIO3
3
GPIO2
4
GPIO1
5
GPIO0
Device
DS90UB925Q
DS90UB926Q
DS90UB925Q
DS90UB926Q
DS90UB925Q
DS90UB926Q
DS90UB925Q
DS90UB926Q
DS90UB925Q
DS90UB926Q
Forward Channel
0x12 = 0x04
Auto Load from DS90UB925Q
0x0F = 0x03
0x1F = 0x05
0x0E = 0x30
0x1E = 0x50
0x0E = 0x03
0x1E = 0x05
0x0D = 0x93
0x1D = 0x95
Back Channel
0x12 = 0x04
Auto Load from DS90UB925Q
0x0F = 0x05
0x1F = 0x03
0x0E = 0x50
0x1E = 0x30
0x0E = 0x05
0x0E = 0x05
0x0D = 0x95
0x1D = 0x93
GPO_REG[8:4] Enable Sequence
GPO_REG[8:4] are the outputs only pins. They must be programmed through the local register bits. See Table 7 for the GPO_REG
enable sequencing.
Step 1: Enable the 18-bit mode either through the configuration register bit on DS90UB925Q only. DS90UB926Q is automatically
configured as in the 18-bit mode.
Step 2: To enable GPO_REG8 outputs an “1” , write 0x90 to address 0x21 on DS90UB926Q..
TABLE 7. GPO_REG Enable Sequencing Table
#
Description
1
Enable 18-bit mode
2
GPO_REG8
3
GPO_REG7
4
GPO_REG6
5
GPO_REG5
6
GPO_REG4
Device
DS90UB926Q
DS90UB926Q
DS90UB926Q
DS90UB926Q
DS90UB926Q
DS90UB926Q
Local Access
0x12 = 0x04
(on DS90UB925Q)
0x21 = 0x90
0x21 = 0x10
0x21 = 0x09
0x21 = 0x01
0x20 = 0x90
0x20 = 0x10
0x20 = 0x09
0x20 = 0x01
0x1F = 0x90
0x1F = 0x10
Local Output Value
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
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