AMD Geode LX 600@0.7W Data Book page 365

Display Controller Register Descriptions
6.6.19.9 Vertical Total
Index 06h
Type R/W
Reset Value 00h
Bit Name
7:0 V_TOTAL[7:0]
6.6.19.10 Overflow
Index 07h
Type R/W
Reset Value xxh
These are the high-order bits for several of the vertical programming values. See the descriptions of the respective vertical
registers for descriptions of these fields.
Bit Name
7 V_SYNC_ST9
6 V_DISP_EN_END9
5 V_TOTAL9
4 LINE_COMP8
3 V_BLANK_ST8
2 V_SYNC_ST8
1 V_DISP_EN_END8
0 V_TOTAL8
6.6.19.11 Preset Row Scan
Index 08h
Type R/W
Reset Value 00h
Bit Name
7 RSVD
AMD Geode™ LX Processors Data Book
Vertical Total Register Bit Descriptions
Description
Vertical Total Register Bits [7:0]. This is the low eight bits of a value that specifies the
total number of scan lines on the screen minus 2. This value includes the blanking area
and determines the vertical refresh rate. The high two bits of this value are in the Over-
flow register (Index 07h[5,1]).
Overflow Register Bit Descriptions
Description
Vertical Sync Start Bit 9. See V_SYNC_ST[7:0] bit description (Index 10h[7:0]).
V_SYNC_ST8 is located at bit 2
Vertical Display Enable End Bit 9. See V_DISP_END[7:0] bit description (Index
12h[7:0]). V_DISP_END8 is located at bit 1
Vertical Total Bit 9. See V_TOTAL[7:0] bit description (Index 06h[7:0]). V_TOTAL8
is located at bit 0.
Line Compare Bit 8. See LINE_COMP[7:0] bit description (Index 18h[7:0]).
LINE_COMP9 is located at Index 09h[6].
Vertical Blank Start Bit 8. See V_BLANK_ST[7:0] bit description (Index 15h[7:0]).
V_BLANK_ST9 is located at Index 09h[5].
Vertical Sync Start Bit 8. See V_SYNC_ST[7:0] bit description (Index 10h[7:0]).
V_SYNC_ST9 is located at bit 7.
Vertical Display Enable End Bit 8. See V_DISP_END[7:0] bit description (Index
12h[7:0]). V_DISP_END9 is located at bit 6.
Vertical Total Bit 8. See VTOTAL[7:0] bit description (Index 06h[7:0]). V_TOTAL9 is
located at bit 5.
Preset Row Scan Register Bit Descriptions
Description
Reserved.
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