MiTAC 8355 AMD Athlontm 64 Processor-2, HyperTransport Technology, Debug, Miscellaneous

8355 N/B MAINTENANCE

5.1 AMD ATHLONTM 64 Processor-2

HyperTransport™ Technology

Signal Name	Type		Description
L0_CLKIN_H/L[1:0]	I-HT	Link 0 Clock Input
L0_CTLIN_H/L[1:0]	I-HT	Link 0 Control Input2
L0_CADIN_H/L[15:0]	I-HT	Link 0	Command/Address/Data Input
L0_CLKOUT_H/L[1:0]	O-HT	Link 0	Clock Outputs
L0_CTLOUT_H/L[1:0]	O-HT	Link 0	Control Output
L0_CADOUT_H/L[15:0]	O-HT	Link 0	Command/Address/Data Outputs
LDTSTOP_L	I-IOS	HyperTransport™ Technology Stop Control Input. Used for
		power management and for changing HyperTransport link width
		and frequency
L0_REF1	A	Compensation Resistor to VLDT1
L0_REF0	A	Compensation Resistor to VSS1

Notes:

1.These pins are used in an alternating fashion to compensate RTT by internal comparison to 3/4 VLDT and 1/4 VLDT and compensate RON by comparison to each other around 1/2 VLDT. For proper resistor value, see the AMD Athlon™ 64 Processor Motherboard Design Guide, order

# 24665.

2.The unused L0_CTLIN_H/L[1] pins must be properly terminated such that the true pin is pulled High and the complement is pulled Low. Refer to the AMD Athlon™ 64 Processor Motherboard Design Guide, order# 24665, for details.

Debug

Signal Name	Type	Description
DBREQ_L	I-IOS	Debug Request
DBRDY	O-IOS	Debug Request

Miscellaneous

Signal Name	Type	Description
RESET_L	I-IOS	System Reset
PWROK	I-IOS	Indicates that voltages and clocks have reached specified
		operation
VID[4:0]	O-IOS	Voltage ID to the regulator
THERMDA	A	Anode (+) of the thermal diode
THERMDC	A	Cathode (–) of the thermal diode
THERMTRIP_L	O-IO-O	Thermal Sensor Trip output, asserted at nominal temperature of
	D	125oC.
COREFB_H/L	A	Differential feedback for VDD Power Supply
VDDIOFB_H/L	A	Differential feedback for VDDIO Power Supply
CORE_SENSE	A	VDD voltage monitor pin
VDDA	S	Filtered PLL Supply Voltage
VTT_SENSE	A	VTT voltage monitor pin
VDDIO_SENS	A	VDDIO voltage monitor pin
VDD	S	Core power supply
VDDIO	S	DDR SDRAM I/O ring power supply
VDDLDT_A	S	HyperTransport™ I/O ring power supply for side A and side B
VDDLDT_B		of the package
VTT_A	S	VTT regulator voltage for side A and side B of the die
VTT_B
VS	S	Ground

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