PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 642

• Manufacturer Part Number: PNX1500E
• Manufacturer: NXP Semiconductors

Specifications of PNX1500E

• Lead Free Status / Rohs Status: Not Compliant

NXP Semiconductors
Volume 1 of 1
Table 26: Vector Count Control
Table 27: TransMask
PNX15XX_PNX952X_SER_N_4
Product data sheet
Bit
Offset 0x04 F440
31:24
23:16
15:8
7:0
Bit
Offset 0x04 F444
31:24
23:16
15:8
7:0
Symbol
InitErr[15:8]
InitErr[7:0]
Oct, Len[11:8]
Len[7:0]
Symbol
TMask[31:24]
TMask[23:16]
TMask[15:8]
TMask[7:0]
Vector Count Control
TransMask
Const1 = 2 x dmin
This register is unchanged after the vector is completed.
This register holds the vector length, drawing octant, and the initial error value for the
Bresenham line algorithm. The initial value of the error term is held in bits 31:16 and
is computed by the host processor:
InitErr = 2 x dmin - dmax
Len = dmax + 1
where dmin = min (dx,dy), dmax = max(dx,dy)
The last pixel can be left undrawn by simply decrementing the Len parameter prior to
loading.
Note: Loading the high byte of this register starts the vector drawing engine.
A Len value of 0 is illegal and should be avoided.
This register is unchanged after the vector is completed, but you need to reload it to
start the next vector anyway.
Acces
s
R/W
R/W
R/W
R/W
Acces
s
R/W
R/W
R/W
R/W
Value
0
0
0
0
Value
NI
NI
NI
NI
Rev. 4.0 — 03 December 2007
Description
Initial error value for the Bresenham line algorithm
Bits 15:13 specify the drawing octant as follows:
Bit 15
1 = Y is major axis
0 = X is major axis
Bit 14
1 = negative X step
0 = positive X step
Bit 13
1 = negative Y step
0 = positive Y step
Length of the major axis in pixels
Description
Transparency mask used in the color compare
PNX15xx/952x Series
Chapter 20: 2D Drawing Engine
© NXP B.V. 2007. All rights reserved.
20-642