Dvob And Dvoc Port Interface Routing Guidelines; Length Mismatch Requirements - Intel 855GME Design Manual

®
Intel 855GME Chipset and Intel
Table 49. AGP/DVO Pin Muxing
DVO MODE
DVOBD[0]
DVOBD[1]
DVOBD[2]
DVOBD[3]
DVOBD[4]
DVOBD[5]
DVOBD[6]
DVOBD[7]
DVOBD[8]
DVOBD[9]
DVOBD[10]
DVOBD[11]
DVOBCLK
DVOBCLK#
DVOBHSYNC
DVOBVSYNC
DVOBBLANK#
DVOBFLDSTL
6.3.2

DVOB and DVOC Port Interface Routing Guidelines

For Intel 855GME chipset platforms, guidelines apply for both interfaces.
6.3.2.1

Length Mismatch Requirements

The routing guidelines presented in the following subsections define the recommended routing
topologies, trace width and spacing geometries, and absolute minimum and maximum routed
lengths for each signal group, which are recommended to achieve optimal SI and timing. In
addition to the absolute length limits provided in the individual guideline tables, more restrictive
length matching requirements are also provided that further restrict the minimum to maximum
length range of each signal group with respect to clock strobe, within the overall boundaries
defined in the guideline tables, as required to ensure adequate timing margins. These secondary
constraints are referred to as length matching constraints. The amount of minimum to maximum
length variance allowed for each group around the clock strobe reference length varies from signal
group to signal group depending on the amount of timing variation, which may be tolerated. Refer
to Table 50
AGP MODE DVO MODE
GAD[3] DVOCD[0]
GAD[2] DVOCD[1]
GAD[5] DVOCD[2]
GAD[4] DVOCD[3]
GAD[7] DVOCD[4]
GAD[6] DVOCD[5]
GAD[8] DVOCD[6]
GCBE#[0] DVOCD[7]
GAD[10] DVOCD[8]
GAD[9] DVOCD[9]
GAD[12] DVOCD[10]
GAD[11] DVOCD[11]
GADSTB[0] DVOCCLK
GADSTB#[0] DVOCCLK#
GAD[0] DVOCHSYNC
GAD[1] DVOCVSYNC
GCBE#[1] DVOCBLANK#
GAD[14] DVOCFLDSTL
for DVO length matching requirements.
January 2007
®
6300ESB ICH Embedded Platform Design Guide
Integrated Graphics Display Port
AGP MODE
GAD[19]
GAD[20]
GAD[21]
GAD[22]
GAD[23]
GCBE#[3]
GAD[25]
GAD[24]
GAD[27]
GAD[26]
GAD[29]
GAD[28]
GADSTB[1]
GADSTB#[1]
GAD[17]
GAD[16]
GAD[18]
GAD[31]
DVO MODE AGP MODE
MI2CCLK GIRDY#
MI2CDATA GDEVSEL#
MDVICLK GTRDY#
MDVIDATA GFRAME#
MDDCCDATA GAD[15]
MDDCCLK GSTOP#
DVOBCINT# GAD[30]
DVOBCCLKINT GAD[13]
ADDID[7] GSBA[7]
ADDID[6] GSBA[6]
ADDID[5] GSBA[5]
ADDID[4] GSBA[4]
ADDID[3] GSBA[3]
ADDID[2] GSBA[2]
ADDID[1] GSBA[1]
ADDID[0] GSBA[0]
DVODETECT GPAR
DPMS GPIPE#
163