DS90UB913A-Q1 Datasheet, PDF (22/51 Pages) Texas Instruments – 25-MHz to 100-MHz 10/12-Bit FPD-Link III Serializer

DS90UB913A-Q1
SNLS443C – MAY 2013 – REVISED APRIL 2016
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8.4.4 Internal Oscillator
When a PCLK is not applied to the DS90UB913A, the serializer will establish the FPD-III link using an internal
oscillator. During normal operation (not BIST) the frequency of the internal oscillator can be adjusted from
DS90UB913A register 0x14[2:1] according to Table 2. In BIST mode, the internal oscillator frequency should only
be adjusted from the DS90UB914A. The BIST frequency can be set by either pin strapping (Table 3) or register
(Table 4). In BIST DS90UB913A register 0x14[2:1] is automatically loaded from the DS90UB914A through the bi-
directional control channel.
Table 2. Clock Sources for Forward Channel Frame on the Serializer During Normal Operation
DS90UB913A-Q1
Reg 0x14 [2:1]
00
01
10
11
10–BIT
MODE (MHz)
50
100
50
25
12–BIT
HIGH-FREQUENCY MODE
(MHz)
37.5
75
37.5
-
12–BIT
LOW-FREQUENCY MODE
(MHz)
25
50
25
-
8.4.5 Built In Self Test
An optional At-Speed Built In Self Test (BIST) feature supports the testing of the high-speed serial link and low-
speed back channel. This is useful in the prototype stage, equipment production, and in-system test and also for
system diagnostics.
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