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

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6.5.1 VIC Control Register (VICCTL)
VIC Port Registers
The VIC control register (VICCTL) is shown in Figure 6-3 and described in Table 6-4 .
Figure 6-3. VIC Control Register (VICCTL)
31 16
Reserved
R-0
15 4 3 1 0
Reserved PRECISION GO
R-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; - n = value after reset
Table 6-4. VIC Control Register (VICCTL) Field Descriptions
Bit field symval
(1)
Value Description
31-4 Reserved - 0 Reserved. The reserved bit location is always read as 0. A value written to this field
has no effect.
3-1 PRECISION OF( value) 0-7h Precision bits determine the resolution of the interpolation. The PRECISION bits can
only be written when the GO bit is cleared to 0. If the GO bit is set to 1, a write to the
PRECISION bits does not change the bits.
DEFAULT 0 16 bits
16BITS
15BITS 1h 15 bits
14BITS 2h 14 bits
13BITS 3h 13 bits
12BITS 4h 12 bits
11BITS 5h 11 bits
10BITS 6h 10 bits
9BITS 7h 9 bits
0 GO OF( value) The GO bit can be written to at any time.
DEFAULT 0 The VICDIV and VICCTL registers can be written to without affecting the operation of
the VIC port. All the logic in the VIC port is held in reset state and a 0 is output on the
0
VCTL output line. A write to VICCTL bits as well as setting GO to 1 is allowed in a
single write operation. The VICCTL bits change and the GO bit is set, disallowing any
further changes to the VICCTL and VICDIV registers.
1 1 The VICDIV and VICCTL (except for the GO bit) registers cannot be written. If a write
is performed to the VICDIV or VICCTL registers when the GO bit is set, the values of
these registers remain unchanged. If a write is performed that clears the GO bit to 0
and changes the values of other VICCTL bits, it results in GO = 0 while keeping the
rest of the VICCTL bits unchanged. The VIC port is in its normal working mode in this
state.
(1)
For CSL implementation, use the notation VIC_VICCTL_ field_ symval
SPRUEM1 – May 2007 VCXO Interpolated Control Port 171
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