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Intel
82845G/82845GL/82845GV GMCH
Datasheet
7
5
System Address
................................................................................................139
5.1
System Memory Address Ranges ...............................................................139
5.1.1
Compatibility Area...........................................................................141
5.1.2
Extended Memory Area ..................................................................143
5.1.2.1
15 MB–16 MB Window....................................................143
5.1.2.2
Pre-Allocated Memory.....................................................143
5.1.3
AGP Memory Address Ranges.......................................................146
Electrical Characteristics
..............................................................................147
6.1
Absolute Maximum Ratings.........................................................................147
6.2
Thermal Characteristics...............................................................................147
6.3
Power Characteristics..................................................................................148
6.4
Signal Groups..............................................................................................148
6.5
DC Parameters............................................................................................150
6.6
DAC Characteristics.....................................................................................153
6.6.1
DAC DC Characteristics .................................................................153
6.6.2
DAC Reference and Output Specifications.....................................154
6.6.3
DAC AC Characteristics..................................................................154
Ballout and Package Information
...............................................................155
7.1
Intel
82845G GMCH Ballout ......................................................................155
7.2
Package Information....................................................................................170
Testability
.............................................................................................................173
8.1
XOR Test Mode Initialization .......................................................................173
8.2
XOR Chain Definition...................................................................................173
8.3
XOR Chains Excluded Pins.........................................................................180
Intel
82845GL/82845GV GMCH
.................................................................181
9.1
Processor System Bus (PSB) Frequency....................................................181
9.2
No AGP Interface.........................................................................................182
9.3
Intel
82845G and
Intel
82845GL/82845GV Signal Differences ...............182
9.3.1
Functional Straps (82845GL only)..................................................182
9.4
Intel
82845G and Intel
82845GL/82845GV Register Differences............183
9.4.1
DRAM Controller/Host-Hub Interface Device Registers (Device 0) 183
9.4.1.1
Device 0 Registers Not in 82845GL/82845GV................183
9.4.1.2
Device 0 Register Bit Differences....................................184
9.4.2
Host-to-AGP Bridge Registers (Device 1).......................................186
9.5
Synchronous Display Differences................................................................186
9.6
Intel
82845GL\82845GV GMCH Ballout....................................................186
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