pnx1700 NXP Semiconductors, pnx1700 Datasheet - Page 642

• Manufacturer Part Number: pnx1700
• Description: Connected Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Volume 1 of 1
Table 20: Blt Control
PNX17XX_SER_1
Preliminary data sheet
Bit
Offset 0x04 F428
31:27
26:24
23:20
19
18:16
Symbol
Reserved
BD[2:0]
A[3:0]
Reserved
CC[2:0]
Blt Control
Acces
s
R/W
R/W
R/W
Value
0
0
0
Rev. 1 — 17 March 2006
Description
The BD[2:0] field specifies the bitblt direction. BD[0] specifies the
horizontal BLT direction. It is bit 24 of this register:
0 = Blt direction is left to right.
1 = Blt direction is right to left.
BD[1] specifies the vertical BLT direction. It is bit 25 of this register:
0 = Blt direction is top to bottom.
1 = Blt direction is bottom to top.
BD[2] enables vertical flipping during the BLT by allowing the source
data to be read in the opposite vertical direction from the destination
data. Bd[2] is bit 26 of this register:
0 = Src is read as specified in BD[1.]
1 = Src is read in reverse of BD[1].
The A[3:0] field controls alpha-blending operations and is in bits
23:20 of this register. A[1:0] controls enabling of alpha-blending and
the format of the source data. The valid values are:
0 = Alpha-blending is disabled.
1 = Src data contains normal alpha data.
2 = Src data contains pre-multiplied alpha data.
3 = Src data does not have alpha data, surface alpha is the only
alpha value.
Bit 2 of this field controls the updating of the alpha field in the
destination:
0 = Preserve destination alpha field.
1 = Update destination alpha field.
Bit 3 of this field controls whether destination data participates in the
alpha blend operation. It is used to implement “unary” blends:
0 = Blend source with destination data
1 = Blend source with black
IN RGB mode, “black” means RGB = (0, 0, 0). In YUV mode, “black”
means YUV = (16, 128, 128).
The CC[2:0] specifies the operation of the color compare hardware.
CC[2:0] are bits 19:16 of this register. Legal values are:
0 = Color compare disabled.
1 = SRC data is used for color compare, perform write operation
if colors match.
2 = DST data is used for color compare, perform write operation
if colors match.
3 = Reserved
4 = Reserved
5 = SRC data is used for color compare, perform write operation
if colors don’t match.
6 = DST data is used for color compare, perform write operation
if colors don’t match.
7 = Reserved
Chapter 20: 2D Drawing Engine
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX17xx Series
20-22