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5.1 Intel 915PM North Bridge(7)
LVDS Signals
Signal Name Type Description
LDVS Channel A
LADATAP[2:0] I/O
LVDS
Channel A differential data output - positive
LADATAN[2:0] I/O
LVDS
Channel A differential data output –negative
LACLKP
I/O
LVDS
Channel A differential clock output – positive
LACLKN I/O
LVDS
Channel A differential clock output – negative
LDVS Channel B
LBDATAP[2:0] I/O
LVDS
Channel B differential data output – positive
NOTE: Signals do not exist in Intel 915GMS.
LBDATAN[2:0] I/O
LVDS
Channel B differential data output –negative
NOTE: Signals do not exist in Intel 915GMS.
LBCLKP I/O
LVDS
Channel B differential clock output – positive
NOTE: Signals do not exist in Intel 915GMS.
LBCLKN I/O
LVDS
Channel B differential clock output – negative
NOTE: Signals do not exist in Intel 915GMS.
LFP Panel power and backlight control
LVDD_EN O
HVCMOS
LVDS panel power enable: Panel power control enable control.
This signal is also called VDD_DBL in the CPIS specification and is
used to control the VDC source to the panel logic.
LBKLT_EN O
HVCMOS
LVDS backlight enable: Panel backlight enable control.
This signal is also called ENA_BL in the CPIS specification and is
used to gate power into the backlight circuitry.
LBKLT_CRTL O
HVCMOS
Panel backlight brightness control: Panel brightness control.
This signal is also called VARY_BL in the CPIS specification and is
used as the PWM Clock input signal.
LVDS Reference signals
LIBG I/O
Ref
LVDS Reference Current. –
1.5 kΩ Pull down resistor needed
LVREFH
I
Ref
Reserved. - No connect.
LVREFL I
Ref
Reserved. - No connect.
LVBG O
A
Reserve. - No connect
Note: LVDS Channel B interface is not supported and do not exist for Intel 915GMS
DDR SDRAM Reference and Compensation
Signal Name Type Description
SMRCOMPN I/O
A
System Memory RCOMP N:
Buffer compensation
This signal is powered by the System Memory rail (2.5 V for DDR,
1.8 V for DDR2).
SMRCOMPP I/O
A
System Memory RCOMP P:
Buffer compensation
This signal is powered by the System Memory rail
SMXSLEWIN I
A
X Buffer Slew Rate Input control.
SMXSLEWOUT O
A
X Buffer Slew Rate Output control.
SMYSLEWIN
I
A
Y Buffer Slew Rate Input control.
SMYSLEWOUT O
A
Y Buffer Slew Rate Output control.
SMVREF[1:0] I
A
SDRAM Reference Voltage:
Reference voltage inputs for each DQ, DQS, & RCVENIN#.
Also used during ODT RCOMP.
SMOCDCOMP[1
:0]
I
A
On-Die DRAM OCD driver compensation
OCD compensation
Display Data Channel (DDC) and GMBUS Support
Signal Name Type Description
LCTLA_CLK I/O
COD
I2C Based control signal (Clock) for External SSC clock chip
control –
LCTLB_DATA I/O
COD
I2C Based control signal (Data) for External SSC clock chip control –
DDCCLK I/O
COD
CRT DDC clock monitor control support
DDCDATA I/O
COD
CRT DDC Data monitor control support
LDDC_CLK I/O
COD
EDID support for flat panel display
LDDC_DATA
I/O
COD
EDID support for flat panel display
SDVOCTRL_CL
K
I/O
COD
I2C Based control signal (Clock) for SDVO device
SDVOCTRL_DA
TA
I/O
COD
I2C Based control signal (Data) for SDVO device
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