Cirrus-logic EP93xx Instrukcja Użytkownika Strona 290

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8-26 DS785UM1
Copyright 2007 Cirrus Logic
Graphics Accelerator
EP93xx User’s Guide
8
8
8
BLKSRCWIDTH
Address: 0x8004_0010 - Read/Write
Default: 0x0000_0000
Mask: 0x0000_0FFF
Definition: Block Function Source Width Register
Bit Descriptions:
RSVD: Reserved. Unknown during read.
WIDTH: 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 Table 8-18 on page 8-12.
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.
SRCLINELENGTH
Address: 0x8004_0014 - Read/Write
Default: 0x0000_0000
Mask: 0x0000_0FFF
Definition: Block Source Line Length Register
Bit Descriptions:
RSVD: Reserved - Unknown during read
LEN: Length - Read/Write
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD
1514131211109876543210
RSVD WIDTH
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD
1514131211109876543210
RSVD LEN
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