Electrical Characteristics

280 Datasheet

11.3 Signal Groups

The signal description includes the type of buffer used for the particular signal.

Type Description

PCI

Express*

PCI Express interface signals. These signals are compatible with PCI Express 2.0

Signaling Environment AC Specifications and are AC coupled. The buffers are not

3.3 V tolerant. Differential voltage spec = (|D+ – D-|) * 2 = 1.2Vmax. Single-ended

maximum = 1.25 V. Single-ended minimum = 0 V.

DMI

Direct Media Interface signals. These signals are compatible with PCI Express 1.0

Signaling Environment AC Specifications, but are DC coupled. The buffers are not

3.3 V tolerant. Differential voltage spec = (|D+ – D-|) * 2 = 1.2 Vmax. Single-

ended maximum = 1.25 V. Single-ended minimum = 0 V.

GTL+

Open Drain GTL+ interface signal. Refer to the GTL+ I/O Specification for complete

details.

HCSL

Host Clock Signal Level buffers. Current mode differential pair. Differential typical

swing = (|D+ – D-|) * 2 = 1.4 V. Single ended input tolerant from -0.35 V to 1.2 V.

Typical crossing voltage 0.35 V.

SSTL-1.8

Stub Series Termination Logic. These are 1.8 V output capable buffers. 1.8 V

tolerant.

SSTL-1.5

Stub Series Termination Logic. These are 1.5 V output capable buffers. 1.5 V

tolerant.

CMOS CMOS buffers

Analog

Analog reference or output. May be used as a threshold voltage or for buffer

compensation.

Datasheet 281

Electrical Characteristics

Table 25. Signal Groups

Signal Type Signals Notes

Host Interface Signal Groups

GTL+ Input/Outputs

FSB_ADSB, FSB_BNRB, FSB_DBSYB, FSB_DINVB_3:0,

FSB_DRDYB, FSB_AB_35:3, FSB_ADSTBB_1:0, FSB_DB_63:0,

FSB_DSTBPB_3:0, FSB_DSTBNB_3:0, FSB_HITB, FSB_HITMB,

FSB_REQB_4:0

GTL+ Common

Clock Outputs

FSB_BPRIB, FSB_BREQ0B, FSB_CPURSTB, FSB_DEFERB,

FSB_TRDYB, FSB_RSB_2:0

Analog Host I/F Ref

& Comp. Signals

FSB_RCOMP, FSB_SCOMP, FSB_SCOMPB, FSB_SWING,

FSB_DVREF, FSB_ACCVREF

GTL+ Input FSB_LOCKB, BSEL2:0

PCI Express* Graphics Interface Signal Groups

PCI Express* Input PCI Express* Interface: PEG_RXN_15:0, PEG_RXP_15:0

PCI Express* Output PCI Express* Interface: PEG_TXN_15:0, PEG_TXP_15:0

Analog PCI Express*

Compensation

Signals

EXP_COMPO, EXP_COMPI

Direct Media Interface Signal Groups

DMI Input DMI_RXP_3:0, DMI_RXN_3:0

DMI Output DMI_TXP_3:0, DMI_TXN_3:0

System Memory Interface Signal Groups

SSTL-1.8 / SSTL-1.5

Input/Output

DDR_A_DQ_63:0, DDR_A_DQS_7:0, DDR_A_DQSB_7:0

DDR_B_DQ_63:0, DDR_B_DQS_7:0, DDR_B_DQSB_7:0

DDR_A_CB_7:0, DDR_A_DQS_8, DDR_A_DQSB_8

DDR_B_CB_7:0, DDR_B_DQS_8, DDR_B_DQSB_8

SSTL-1.8 / SSTL-1.5

Output

DDR_A_CK_5:0, DDR_A_CKB_5:0, DDR_A_CSB_3:0,

DDR3_A_CSB_1, DDR_A_CKE_3:0, DDR_A_ODT_3:0,

DDR_A_MA_14:0, DDR3_A_MA_0, DDR_A_BS_2:0,

DDR_A_RASB, DDR_A_CASB, DDR_A_WEB, DDR3_A_WEB,

DDR_A_DM_7:0

DDR_B_CK_5:0, DDR_B_CKB_5:0, DDR_B_CSB_3:0,

DDR_B_CKE_3:0, DDR_B_ODT_3:0, DDR3_B_ODT_3,

DDR_B_MA_14:0, DDR_B_BS_2:0, DDR_B_RASB,

DDR_B_CASB, DDR_B_WEB, DDR_B_DM_7:0

DDR3_DRAMRST

CMOS Input DDR3_DRAM_PWROK

Reference and

Comp. Voltages

DDR_RCOMPXPD, DDR_RCOMPXPU, DDR_RCOMPYPD,

DDR_RCOMPYPU, DDR_VREF

Controller Link Signal Groups

CMOS I/O OD CL_DATA, CL_CLK

CMOS Input CL_RSTB, CL_PWROK

Analog Controller

Link Reference

Voltage

CL_VREF

Electrical Characteristics

282 Datasheet

NOTES:

1. CB_7:0, DQS[8], and DQSB[8] ECC signals are only for DDR2

Clocks

HCSL

HPL_CLKINP, HPL_CLKINN, EXP_CLKINP, EXP_CLKINN,

DPL_REFCLKINN, DPL_REFCLKINP

Reset, and Miscellaneous Signal Groups

CMOS Input EXP_SLR, PWROK, RSTINB

CMOS Output ICH_SYNCB

I/O Buffer Supply Voltages

System Bus Input

Supply Voltage

VTT_FSB

1.25 V PCI Express*

Supply Voltages

VCC_EXP

3.3 V PCI Express*

Analog Supply

Voltage

VCCA_EXP

1.8 V DDR2 / 1.5 V

DDR3 Supply

Voltage

VCC_DDR

1.8 V DDR2 / 1.5 V

DDR3 Clock Supply

Voltage

VCC_CKDDR

1.25 V MCH Core

Supply Voltage

VCC

1.25 V Controller

Supply Voltage

VCC_CL

3.3 V CMOS Supply

Voltage

VCC3_3

PLL Analog Supply

Voltages

VCCA_HPLL, VCCAPLL_EXP, VCCA_MPLL

Table 25. Signal Groups

Signal Type Signals Notes

Part #	31761
Description
Category	RELAY
Availability	In Stock
Qty	1

31761

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