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334 AMD Geode™ LX Processors Data Book
Display Controller Register Descriptions
33234H
DC_LINE_CNT/STATUS Register Map
313029282726252423222120191817161514131211109876543210
DNA
VNA
VSA
RSVD
FLIP
V_LINE_CNT
VFLIP
SIGC
EVEN_FIELD
RSVD DOT_LINE_CNT
DC_LINE_CNT/STATUS Bit Descriptions
Bit Name Description
31 DNA Display Not Active.
0: Display active.
1: Display not active (i.e., blanking or border).
30 VNA Vertical Not Active.
0: Vertical display active.
1: Vertical display not active (i.e., vertical blanking or border).
29 VSA Vertical Sync Active.
0: Vertical sync not active.
1: Vertical sync active.
28 RSVD Reserved.
27 FLIP Flip.
0: Newly programmed DC_FB_ST_OFFSET (DC Memory Offset 010h[27:0]) has not
been latched by display address generation hardware yet.
1: Previously programmed DC_FB_ST_OFFSET (DC Memory Offset 010h[27:0]) has
been latched by display address generation hardware.
26:16 V_LINE_CNT DC Line Count. This value is the current scan line of the DC Engine. The DC Engine,
which fetches the frame buffer data, performs compression and de-compression, and
overlays cursor data, typically runs several scan lines ahead of the actual display. This
allows for buffering and scaling/filtering of graphics data.
15 VFLIP Video Flip.
0: Newly programmed DC_VID_Y_ST_OFFSET (DC Memory Offset 020h[27:0]) has not
been latched by display address generation hardware yet.
1: Previously programmed DC_VID_Y_ST_OFFSET (DC Memory Offset 020h[27:0]) has
been latched by display address generation hardware.
14 SIGC Signature Complete. A 1 in this bit indicates that the CRC signature operation has com-
pleted and the resulting signature value may be safely read by software.
13 EVEN_FIELD Even Field Indicator. When interlacing is enabled, a 1 in this bit indicates that the cur-
rent field is the even field.
12:11 RSVD Reserved.
10:0 DOT_LINE_
CNT
Dot Line Count. This value is the current scan line of the display. This field is NOT syn-
chronized in hardware, so software should read this value twice to ensure that the result
is correct.