ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 295

• Manufacturer Part Number: ALXD800EEXJ2VD
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of ALXD800EEXJ2VD

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Display Controller
6.5.9
For interlaced modes, the V_ACTIVE and V_TOTAL fields
are configured for the odd field. The Even Field Vertical
Timing registers (DC Memory Offsets 0E4h-0ECh) are
configured for the corresponding even field. Figure 6-22 on
page 296 shows a representative timing diagram for the
odd and even timing register settings in interlaced modes,
and Table 6-43 on page 296 presents the (decimal) timing
values for some common interlaced modes.
The DC is capable of producing an interlaced output using
any of three separate mechanisms. It can fetch the graph-
ics data in an interlaced manner, flicker filter the graphics
data, or use the same graphics data for both odd and even
Note 1.
AMD Geode™ LX Processors Data Book
Mode
Default (no VGA, scal-
ing, interlacing, or flicker
filter)
Scaling only
Interlacing only (no flicker
filter)
Interlacing with flicker fil-
ter
Interlacing with inter-
laced addressing (no
flicker filter)
Interlacing with scaler (no
flicker filter, no interlaced
addressing)
Interlacing with scaler
and flicker filter
VGA (no scaling, interlac-
ing, or flicker filter)
VGA with scaling (no
interlacing or flicker filter
VGA with scaling and
interlacing (no flicker fil-
ter)
VGA with scaling, inter-
lacing, and flicker filter
Interlaced Modes
Because the register value represents the image size minus 1, an additional 1 is added when these two register values are added
together to retain the convention.
Pre-scale
Horizontal
Width
H_ACTIVE
FB_H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
FB_H_ACTIVE
FB_H_ACTIVE
VGA CRTC
VGA CRTC
VGA CRTC
VGA CRTC
Table 6-42. Programming Image Sizes
Pre-scale
Height
V_ACTIVE
FB_V_ACTIVE
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE +
V_ACTIVE_EVE
N + 1 (Note 1)
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
FB_V_ACTIVE
FB_V_ACTIVE
VGA CRTC
VGA CRTC
VGA CRTC
VGA CRTC
Post-scaler
Width
H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
VGA CRTC
H_ACTIVE
H_ACTIVE
H_ACTIVE
fields, (which would effectively line-double the resulting
image). When the VGA is being used, interlaced address-
ing is not supported, and scaling must be used. When the
frame buffer source image or the output image is wider
than 1024 active pixels, the flicker filter is not supported.
When scaling and/or interleaving is enabled, the size of the
frame buffer image (in pixels) will vary from the size of the
output image. Table 6-42 and Table 6-44 on page 297 indi-
cates how the DC’s timing register fields should be pro-
grammed for supported scaling and interlacing modes.
(Note that for VGA modes, there are several VGA registers
that can affect the size of the frame buffer image. These
registers are not enumerated in the table.)
Post-scaler
Height
V_ACTIVE
V_ACTIVE
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE +
V_ACTIVE_EVE
N + 11
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE +
V_ACTIVE_EVE
N + 11
VGA CRTC
V_ACTIVE
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE +
V_ACTIVE_EVE
N + 11
33234C
Final (Output)
Width
H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
H_ACTIVE
VGA CRTC
H_ACTIVE
H_ACTIVE
H_ACTIVE
Final (Output)
Height
V_ACTIVE
V_ACTIVE
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
VGA CRTC
V_ACTIVE
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
V_ACTIVE or
V_ACTIVE_EVE
N (alternating)
295