Intel PCI-X manual Extended Device Control Register, Ctrlext 00018h, R/W, 23 16

Register Descriptions

13.4.6Extended Device Control Register

CTRL_EXT (00018h, R/W)

This register and the Device Control register (CTRL) controls the major operational modes for the Ethernet controller. CTRL_EXT provides extended control of the Ethernet controller functionality over the Device Control register (CTRL).

Note: See Table 13-12and Table 13-13for the 82544GC/EI.

Table 13-10. CTRL_EXT Register Bit Description

31 - 24 23 - 16 15 0

Reserved

Extended Device Control Bits

Field	Bit(s)	Initial	Description
		Value
Reserved	1:0	0b	Reserved bits for the 82541xx and 82547GI/EI. Should be written
			as 0b to ensure future compatibility.
			General Purpose Interrupt Enables
			These bits determine whether the upper three software definable
GPI_EN	3:0	0b	pins SDP[7:6] and SDP[4] are mapped to the ICR.GPI interrupt
			bits. These mappings are enabled only when the SDP[7:6] and
			SDP[4] pins are configured as inputs through
			CTRL_EXT.SWDPIOHI. Refer to Table 13-11for SDP to ICR.GPI
			bit mapping.
			General Purpose Interrupt Enables for the 82541xx and 82547GI/
			EI.
GPI_EN	3:2	0b	These bits determine whether the upper software definable pins
			SDP[3:2] are mapped to the ICR.GPI interrupt bits. These
			mappings are enabled only when the SDP[3:2] pins are configured
			as inputs through CTRL_EXT.SWDPIOHI. Refer to Table 13-11for
			SDP to ICR.GPI bit mapping.
Reserved	4	0b	Reserved. Formally used as SDP4 pin data value. Reads as 0b.
			PHY Interrupt Value. When read, returns the current value of the
PHYINT	5	0b	PHY internal interrupt status PHYINT.
			Note: This is a reserved bit for the 82541xx and 82547GI/EI.
SDP6_DATA			SDP6[2] Data Value. Used to read (write) value of software-
	6	0b1	controllable IO pin SDP6[2]. If SDP6[2] is configured as an output
SDP2_DATA			(SDP6[2]_IODIR = 1b), this bit controls the value driven on the pin
(82541xx and			(initial value EEPROM-configurable). If SDP6[2] is configured as
82547GI/EI)			an input, reads return the current value of the pin.
SDP7_DATA			SDP7[3] Data Value. Used to read (write) value of software-
		0b1	controllable IO pin SDP7[3]. If SDP7[3] is configured as an output
SDP3_DATA	7		(SDP7[3]_IODIR = 1b), this bit controls the value driven on the pin
(82541xx and			(initial value EEPROM-configurable). If SDP7[3] is configured as
82547GI/EI)			an input, reads return the current value of the pin.
Reserved	9:8	01b	Reserved
			Should be written as 01b to ensure future compatibility.

Software Developer’s Manual 233