參數(shù)資料
型號： 82815EM
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù)： 32/163頁
文件大小： 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
32
Datasheet
2.8.
Power Signals
Signal Name
Type
Description
V_1.8
Power
Core Power (1.8V)
VDDQ
Power
AGP I/O and Display Cache Buffer Supply Power
VSUS_3.3
Power
System Memory Buffer Power (Separate 3.3V power plane for power down modes)
VCCDA
Power
Display Power Signal (Connect to an isolated 1.8V plane with VCCDACA1 and
VCCDACA2)
VCCDACA1
Power
Display Power Signal (Connect to an isolated 1.8V plane with VCCDA and
VCCDACA2)
VCCBA
Power
AGP/Hub I/F Power (1.8V)
VCCDACA2
Power
Display Power Signal (Connect to an isolated 1.8V plane with VCCDA and
VCCDACA1)
VCCDPLL
Power
System Memory PLL Power (1.8V)
VSSDA
Power
Display Ground Signal
VSSDACA
Power
Display Ground Signal
VSS
Power
Core Ground
VSSDPLL
Power
System Memory PLL Ground
VSSBA
Power
AGP/Hub I/F Ground
2.9.
Clock Signals
Signal Name
Type
Description
HCLK
I
CMOS
Host Clock Input:
Clock used on the host interface. This pin receives a buffered
host clock from the external clock synthesizer. Externally generated 100MHz clock.
This clock goes to Intel
815EM chipset PSB logic. This clock is also the reference
for System Memory, Local Memory, and internal graphics core clocks. The clock
synthesizer drives this to 2.5V.
SCLK
I
CMOS
System Memory Clock:
Clock used on the output buffers of system memory.
Externally generated 100MHz clock.
LTCLK[1:0]
O
CMOS
Display Cache Transmit Clocks:
LTCLK[1:0] are internally generated display
cache clocks used to clock the input buffers of the SDRAM devices.
LOCLK
O
CMOS
Output Clock:
LOCLK is an internally generated clock used to drive LRCLK.
LRCLK
I
CMOS
Receive Clock:
LRCLK is a display cache clock used to clock the input buffers of
the GMCH2-M.
DCLKREF
I
CMOS
Display Interface Clock:
DCLKREF is a 48MHz clock generated by an external
clock synthesizer to the GMCH2-M.
HLCLK
I
CMOS
Hub Interface Clock:
66MHz hub interface clock generated by an external clock
synthesizer.
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