Video Port/VCXO Interpolated Control (VIC) Port User's Guide

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6.1 Overview
22k Ω
100pF
5VDC
2.2k Ω
0.1
mF
VCXO
27MHz
VDAC
VIC
STCLK
VDATA[7−0](TSIdatain)
VCLK1(TSIclock)
VCTL1(CAPENA)
VCTL2(PACSTRT)
VCTL3(PACERR)
Satellite/
cable
decoder
with
FEC
Video
port A
DSP
6.2 Interface
Overview
The VCXO interpolated control (VIC) port provides single-bit interpolated VCXO control with resolution
from 9 bits to up to 16 bits. The frequency of interpolation is dependent on the resolution needed.
When the video port is used in transport stream interface (TCI) mode, the VIC port is used to control the
system clock, VCXO, for MPEG transport stream (Figure 6-1 ).
The VIC port supports following features:
• Single-bit interpolated VCXO control
• Programmable precision from 9 to 16 bits
Figure 6-1. TCI System Block Diagram
The pin list for VIC port is shown in Table 6-1 (pins are 3.3V I/Os).
Table 6-1. VIC Port Interface Signals
VIC Port Signal Direction Description
VDAC Output VCXO control
STCLK Input System time clock
VCXO Interpolated Control Port168 SPRUEM1 – May 2007
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