Video Port/VCXO Interpolated Control (VIC) Port User's Guide
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5.1.3 Video Port Pin Function Register (PFUNC)
GPIO Registers
The video port pin function register (PFUNC) selects the video port pins as GPIO. Each bit controls either
one pin or a set of pins. When a bit is set to 1, it enables the pin(s) that map to it as GPIO. The GPIO
feature should not be used for pins that are used as part of the capture or display operation. For pins that
have been muxed out for use by another peripheral, the PFUNC bits will have no effect.
The VDATA pins are broken into two functional groups: VDATA[9-2] and VDATA[19-12]. Thus, each entire
half of the data bus must be configured as either functional pins or GPIO pins. In the case of single
BT.656 or raw 8-bit mode, the upper 10 VDATA pins (VDATA[19-12]) can be used as GPIOs. If the video
port is disabled, all pins can be used as GPIO.
The video port pin function register (PFUNC) is shown in Figure 5-3 and described in Table 5-4 .
Figure 5-3. Video Port Pin Function Register (PFUNC)
31 24
Reserved
R-0
23 22 21 20 19 16
Reserved PFUNC22 PFUNC21 PFUNC20 Reserved
R-0 R/W-0 R/W-0 R/W-0 R/W-0
15 11 10 9 8
Reserved PFUNC10 Reserved
R-0 R/W-0 R-0
7 1 0
Reserved PFUNC0
R-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; - n = value after reset
Table 5-4. Video Port Pin Function Register (PFUNC) Field Descriptions
Bit field
(1)
symval
(1)
Value Description
31-23 Reserved - 0 Reserved. The reserved bit location is always read as 0. A value written to this field
has no effect.
22 PFUNC22 OF( value) PFUNC22 bit determines if VCTL3 pin functions as GPIO.
DEFAULT 0 Pin functions normally.
NORMAL
VCTL3 1 Pin functions as GPIO pin.
21 PFUNC21 OF( value) PFUNC21 bit determines if VCTL2 pin functions as GPIO.
DEFAULT 0 Pin functions normally.
NORMAL
VCTL2 1 Pin functions as GPIO pin.
20 PFUNC20 OF( value) PFUNC20 bit determines if VCTL1 pin functions as GPIO.
DEFAULT 0 Pin functions normally.
NORMAL
VCTL1 1 Pin functions as GPIO pin.
19-11 Reserved - 0 Reserved. The reserved bit location is always read as 0. A value written to this field
has no effect.
(1)
For CSL implementation, use the notation VP_PFUNC_ field_ symval
154 General-Purpose I/O Operation SPRUEM1 – May 2007
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