DS90UB928Q-Q1 Datasheet, PDF (45/69 Pages) Texas Instruments – 5 MHz to 85 MHz 24-bit Color FPD-Link III to FPD-Link Deserializer With Bidirectional Control Channel

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DS90UB928Q-Q1
SNLS417C – MARCH 2013 – REVISED JULY 2016
Register Maps (continued)
Table 8. Serial Control Bus Registers^{(1) (2)} (continued)
ADD
(dec)
ADD
(hex)
Register Name
Bit
Register
Type
Default
(hex)
Function
Description
24
0x18 Mailbox[0]
7:0
RW
0x00
Mailbox
Register 0
Mailbox Register 0
This register may be used to temporarily store
temporary data, such as status or multi-master
arbitration
25
0x19 Mailbox[1]
7:0
RW
0x01
Mailbox
Register 1
Mailbox Register 1
This register may be used to temporarily store
temporary data, such as status or multi-master
arbitration
27
0x1B Frequency
Counter
7:0
RW
0x00
Frequency
Count
Frequency Counter control
A write to this register will enable a frequency counter
to count the number of pixel clock during a specified
time interval. The time interval is equal to the value
written multiplied by the oscillator clock period
(nominally 50 ns). A read of the register returns the
number of pixel clock edges seen during the enabled
interval. The frequency counter will saturate at 0xff if it
reaches the maximum value. The frequency counter
will provide a rough estimate of the pixel clock period.
If the pixel clock frequency is known, the frequency
counter may be used to determine the actual oscillator
clock frequency.
28
0x1C General Status 7:4
0x00
Reserved
3
R
I2S Locked I2S Lock Status
0: I2S PLL controller not locked (default)
1: I2S PLL controller locked to input I2S clock
2
R
CRC Error
CRC Error Detected
0: No CRC errors detected
1: CRC errors detected
1
Reserved
0
R
LOCK
Deserializer CDR and PLL Locked to recovered clock
frequency
0: Deserializer not Locked (default)
1: Deserializer Locked to recovered clock
29
0x1D GPIO0
7:4
R
Configuration
0x20
Revision ID Device Revision ID:
0010: Production Device
3
RW
GPIO0
Output
Value
Local GPIO Output Value This value is output on the
GPIO pin when the GPIO function is enabled, the
local GPIO direction is Output, and remote GPIO
control is disabled.
0: Output LOW (default)
1: Output HIGH
2
RW
GPIO0
Remote
Enable
Remote GPIO Control
0: Disable GPIO control from remote device (default)
1: Enable GPIO control from remote device. The
GPIO pin will be an output, and the value is received
from the remote device.
1
RW
GPIO0
Direction
Local GPIO Direction
0: Output (default)
1: Input
0
RW
GPIO0
Enable
GPIO Function Enable
0: Enable normal operation (default)
1: Enable GPIO operation
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