GX1 datasheet(149/247 Pages) NSC

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Integrated Functions (Continued)

GX_BASE+8324h-8327h

DC_LINE_DELTA Register (R/W) (Locked)

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) (Locked)

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

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

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

8:0

FB_LINE_

SIZE

Frame Buffer Line Size: This value specifies the number of QWORD (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 QWORD + 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 4-30. Display Controller Memory Organization Registers (Continued)

Bit

Name

Description

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