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RH56D-PCI

Host-Controlled V.90/K56flex™ Modem device Family for Desktop Applications

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RH56D-PCI Modem Designer’s Guide

PMC [8:6], PME DRV Type

This register is assigned by Conexant. The value is 01.

PMC [8:6]: This 3- bit field reports the 3.3Vaux auxiliary current requirements for the PCI function. If the Data Register has

been implemented by this function then 1) reads of this field must return a value of “000b” 2) Data Register takes precedence

over this field for 3.3Vaux current requirements. If PME# generation from D3cold is not supported by the function

(PMC(15)=0), then this field must return a value of “000b” when read.

PME DRV Type: This sets the driving capability of the PME pin (0 = active high TTL, 1 = active low Open Drain)

Class Code Register (Class Code, Sub-class Code, Prog. I/F)

This register is always mandatory and is assigned by Conexant. The value is 07 for Class Code, 80 for Sub-class code, and

00 for Prog. I/F.

This register is a 24-bit read-only register divided into three sub-registers: base class, sub-class, and Prog. I/F (programming

interface). The register identifies the basic function of the device via the base class (i.e. for modems: Simple Communications

Controller), a more specific device sub-class (i.e. for modems: Other Communications Device), and in some cases a register-

specific programming interface (not used for modems).

CardBus CIS Pointer (CardBus CIS pointer High, CardBus CIS pointer Low)

This register is optional and is assigned by Conexant. The value is 00000000.

This optional register is implemented by devices that share silicon between CardBus and PCI. This field points to the card

information structure, or CIS, for the CardBus card. This register is read-only and contains the offset of the CIS.

Data Scale PMCSR[14:13] (D0C, D1C, D2C, D3C, D0D, D1D, D2D, D3D)

This value is supplied by the OEM since Conexant implements the Data Register. Until these values are assigned, Conexant

uses a default value 0000.

This field is required for any function that implements the Data Register. The data scale is a 2- bit read-only field which

indicates the scaling factor to be used when interpreting the value of the Data Register. The value and meaning of this field

will vary depending on which data value has been selected by the Data_Select field (PMCSR[12:09]). There are 4 data scales

to select 1) 0 = unknown 2) 1 = 0.1x, 3) 2 = 0.01x, 4) 3 = 0.001x where x is defined by the Data Select Field.

Data Register (D3, D2, D1, D0 power consumed and D3, D2, D1, D0 power dissipated)

This value is supplied by the OEM since Conexant implements the Data Register. Until these values are assigned, Conexant

uses a default value of 0000000000000000.

The Data Register is an optional, 8-bit read-only register that provides a mechanism for the function to report state dependent

operating data such as power consumed or heat dissipation. Typically the data returned through the Data register is a static

copy (look up table, for example) of the function’s worst case “DC characteristics” data sheet. This data, when made available

to system software could then be used to intelligently make decisions about power budgeting, cooling requirements, etc. The

data returned by the data register is selected by the Data Select field (PMCSR[12:09]).

Load CISRAM Count (CIS _SIZE)

This register is optional and is assigned by Conexant. The value is 00.

This register contains an 8-bit value indicating the number of double words to be loaded into the CISRAM for CardBus

support.

PMC[15:9, 5] (D3_Cold, D3_Hot, D2, D1, D0, D2_Support, D1_Support, DSI)

PMC[15:11]: PME_Support (D3_Cold, D3_Hot, D2, D1, D0)- This five bit field indicates the power states in which the function

may assert PME#. A value of 0b for any bit indicates that the function is not capable of asserting the PME# signal while in that

power state. D2 and D1 must be 0 since the modem does not support these states. The rest of the values are supplied by the

OEM and the values depend upon the systems in which the modem will be installed. Conexant uses a default value of 49.

This is for a system which does not support D3cold but supports D3hot.

When D3_Cold is a 1, PMC[15] is set to a 1 if VauxDET is high at device power on reset (POR) or is reset to a 0 if VauxDET

is low at POR. When D3_Cold is a 0, PMC[15] is always 0, regardless of the VauxDET level.

5-8

Conexant

1213

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