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AMD SP5100 Databook
44409 Rev. 1.70 October 10
24
Integrated Resistor and External Pull-up/Pull-down Resistor
Requirements
5 Integrated Resistor and External Pull-up/Pull-down
Resistor Requirements
Table 5-1: External Resistor Requirements and Integrated Pull-Up/Down
Interface
Signal Name
Value of
Integrated / External
Resistor
Resistor Type
Register for
programming the
integrated PU/PD
IDE
IDE_DRQ
Integrated 5.6 K
Pull-down
—
IDE_IORDY
Integrated 4.7 K
Pull-up
—
IDE_IRQ
Integrated 10 K
Pull-down
—
IDE_D7/GPIO22
Integrated 27
Ω
+
integrated 10 K
Pull-
down
(See GPIO section
below)
IDE_D[15:0]/GPIO[30:23, 21:15]
Integrated 27
Ω
Series
IDE_A[2:0]
Integrated 27
Ω
Series
—
IDE_CS[3,1]#
Integrated 27
Ω
Series
—
IDE_DACK#, IOW#, IOR#,
Integrated 27
Ω
Series
——
PCI
Express
®
PCIE_CALRP
External 562
Ω
( 1%
tolerance )
Reference resistor for
the Tx termination.
Pull-down to
VSS_PCIE
PCIE_CALRN
External 2.05 K ( 1%
tolerance )
Reference resistor for
the Rx termination
Pull-UP to
VDD_PCIE
—
USB
USB_HSD[11:0]P
Integrated 15 K
Pull-down
—
USB_HSD[11:0]N
Integrated 15 K
Pull-down
—
USB_FSD[13:12]P
Integrated 15 K
Pull-down
—
USB_FSD[13:12]N
Integrated 15 K
Pull-down
—
HD Audio
AZ_SDIN[2:0]/
GPIO[44:42]
Integrated 50 K
Pull-down
(See GPIO section
below)
AZ_SDIN3/GPIO46
Integrated 50 K
Pull-down
(See GPIO section
below)
NB
ALLOW_LDTSTP
External Pull-up
Pull-up
—
Processor
LDT_PG
External Pull-up
Pull-up
—
LDT_STP#
External Pull-up
Pull-up
—
LDT_RST#
External Pull-up
Pull-up
—
PCI
INTE#/GPIO33
Integrated 8.2 K
Pull-up
(See GPIO section
below)
INTF#/GPIO34
Integrated 8.2 K
Pull-up
(See GPIO section
below)
INTG#/GPIO35
Integrated 8.2 K
Pull-up
(See GPIO section
below)
INTH#/GPIO36
Integrated 8.2 K
Pull-up
(See GPIO section
below)