GXM datasheet(145/244 Pages) NSC

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Integrated Functions (Continued)

GX_BASE+8318h-831Bh

DC_CUR_ST_OFFSET Register (R/W)

Default Value = xxxxxxxxh

31:22

RSVD

Reserved: Set to 0.

21:0

CUR_START

_OFFSET

Cursor Start Offset: This value represents the byte offset of the starting location of the cursor display

pattern. Bits [1:0] should always be programmed to zero so that the start offset is DWORD aligned. The

cursor data will be stored as a linear block of data. The active cursor will always be 32x32x2 bits in size.

Multiple cursor patterns may be loaded into off-screen memory. The start offset is loaded at the start of a

frame. Each cursor pattern will be exactly 256 bytes in size. Note that if there is a Y offset for the cursor

pattern, the cursor start offset should be set to point to the first displayed line of the cursor pattern. The

cursor code for a given pixel is determined by an AND mask and an XOR mask. Each line of a cursor will

be stored as two DWORDs, with each DWORD containing the AND masks for 16 pixels in the upper

word and the XOR masks for 16 pixels in the lower word. DWORDs will be arranged with the leftmost

block of 16 pixels being least significant and the rightmost block being most significant. Pixels within

words will be arranged with the leftmost pixels being most significant and the rightmost pixels being least

significant. The 2-bit cursor codes are as follows.

AND

XOR

Displayed

Cursor Color 0

Cursor Color 1

Transparent

− Background Pixel

11Inverted

− Bit-wise Inversion of Background Pixel

GX_BASE+831Ch-831Fh

Reserved

Default Value = 00000000h

GX_BASE+8320h-8323h

DC_VID_ST_OFFSET Register (R/W)

Default Value = xxxxxxxxh

31:21

RSVD

Reserved: Set to 0.

20:0

VID_START

_OFFSET

Video Buffer Start Offset Value: This is the value for the Video Buffer Start Offset. It represents the

starting location for Video Buffer. Bits [3:0] should always be programmed as zero so that the start offset

is aligned to a 16 byte boundary.

GX_BASE+8324h-8327h

DC_LINE_DELTA Register (R/W)

Default Value = xxxxxxxxh

31:22

RSVD

Reserved: Set to 0.

21:12

CB_LINE_

DELTA

Compressed Display Buffer Line Delta: This value represents number of DWORDs that, when added

to the starting offset of the previous line, will point to the start of the next compressed line in memory. It

is used to always maintain a pointer to the starting offset for the compressed display buffer line being

loaded into the display FIFO.

11:10

RSVD

Reserved: Set to 0.

9:0

FB_LINE_

DELTA

Frame Buffer Line Delta: This value represents number of DWORDs that, when added to the starting

offset of the previous line, will point to the start of the next frame buffer line in memory. It is used to

always maintain a pointer to the starting offset for the frame buffer line being loaded into the display

FIFO.

GX_BASE+8328h-832Bh

DC_BUF_SIZE Register (R/W)

Default Value = xxxxxxxxh

31:30

RSVD

Reserved: Set to 0.

29:16

VID_BUF_

SIZE

Video Buffer Size: These bits set the video buffer size, in 64-byte segments. The maximum size is 1

MB.

15:9

CB_LINE_

SIZE

Compressed Display Buffer Line Size: This value represents the number of DWORDs for a valid com-

pressed line plus 1. It is used to detect an overflow of the compressed data FIFO. It should never be

larger than 41h or 65Dh since the maximum size of the compressed data FIFO is 64 DWORDs.

8:0

FB_LINE_

SIZE

FrameBufferLineSize: This value specifies the number of QWORDS (8-byte segments) to transfer for

each display line from the frame buffer.

If panning is enabled, this value can generally be programmed to the displayed number of QWORDS + 2

so that enough data is transferred to handle any possible alignment. Extra pixel data in the FIFO at the

end of a line will automatically be discarded.

GX_BASE+832Ch-832Fh

Reserved

Default Value = 00000000h

Table 4-31. Display Controller Memory Organization Registers (Continued)

Bit

Name

Description

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