Cirrus Logic EP93 Series User Manual page 290

Graphics Accelerator
EP93xx User's Guide
BLKSRCWIDTH
8
31 30
15 14
RSVD
Address:
Default:
Mask:
Definition:
Bit Descriptions:
SRCLINELENGTH
31 30
15 14
RSVD
Address:
Default:
Mask:
Definition:
Bit Descriptions:
8-26
29 28 27 26
13 12 11 10
0x8004_0010 - Read/Write
0x0000_0000
0x0000_0FFF
Block Function Source Width Register
RSVD:
WIDTH:
29 28 27 26
13 12 11 10
0x8004_0014 - Read/Write
0x0000_0000
0x0000_0FFF
Block Source Line Length Register
RSVD:
LEN:
Copyright 2007 Cirrus Logic
25 24 23 22
RSVD
9 8 7 6
WIDTH
Reserved. Unknown during read.
Width - Read/Write
For a Block Copy function, the value in this field specifies
the number of 32-bit words, minus 1, that are needed to
contain the pixels in the 1st scan line of the source image.
For an example, please refer to
Six 32-bit words are needed to contain six 24-bit pixels.
So, WIDTH = 6 - 1 = 5 = 0x5.
The maximum value for the field is 0xFFE = 4095 words.
25 24 23 22
RSVD
9 8 7 6
LEN
Reserved - Unknown during read
Length - Read/Write
21 20 19 18
5 4 3 2
Table 8-18 on page
21 20 19 18
5 4 3 2
17 16
1 0
8-12.
17 16
1 0
DS785UM1