Datasheet

38 www.national.com
4.0 Register Set (Continued)
DP83815
4.1.10 Configuration Interrupt Select Register
This register stores the interrupt line number as identified by the POST software that is connected to the interrupt
controller as well as DP83815 desired settings for maximum latency and minimum grant. Max latency and Min latency
can be loaded from the EEPROM.
4.1.11 Power Management Capabilities Register
This register provides information on the capabilities of the functions related to power management. This register also
contains a pointer to the next item in the capabilities list and the capability ID for Power Management. This register is only
visible if CFGCS[4] is set.
Tag: CFGINT Size: 32 bits Hard Reset: 340b0100h
Offset: 3Ch Access: Read Write Soft Reset: unchanged
Bit Bit Name Description
31-24 MXLAT Maximum Latency
The DP83815 desired setting for Max Latency. The DP83815 will initialize this field to 52d (13 µsec). The
value in this register can be loaded from the EEPROM.
23-16 MNGNT Minimum Grant
The DP83815 desired setting for Minimum Grant. The DP83815 will initialize this field to 11d (2.75 usec).
The value in this register can be loaded from the EEPROM.
15-8 IPIN Interrupt Pin
Read Only, always return 0000 0001 (INTA).
7-0 ILINE Interrupt Line
Set to which line on the interrupt controller that the DP83815's interrupt pin is connected to.
Tag: PMCAP Size: 32 bits Hard Reset: FF820001
Offset: 40h Access: Read Only Soft Reset: unchanged
Bit Bit Name Description
31-27 PMES PME Support
This 5 bit field indicates the power states in which DP83815 may assert PMEN. A 1 indicates PMEN
is enabled for that state, a 0 indicates PMEN is inhibited in that state.
XXXX1 - PMEN can be asserted from state D0
XXX1X - PMEN can be asserted from state D1
XX1XX - PMEN can be asserted from state D2
X1XXX - PMEN can be asserted from state D3hot
1XXXX - PMEN can be asserted from state D3cold
The DP83815 will only report PME support for D3cold if auxiliary power is detected on the 3VAUX
pin, in addition this value can be loaded from the EEPROM when in the D3cold state.
26 D2S D2 Support
This bit is set to a 1 when the DP83815 supports the D2 state.
25 D1S D1 Support
This bit is set to a 1 when the DP83815 supports the D1 state.
Obsolete