Texas Instruments TMS320DM648 manual Video Port Pin Function Register Pfunc

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GPIO Registers

5.1.3 Video Port Pin Function Register (PFUNC)

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 5-3and 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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