RH56D-PCI Ver la hoja de datos (PDF) - Unspecified

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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

5.3.2 Definitions

Device ID Register

This mandatory 16-bit register identifies the type of device and is assigned by Conexant. Valid values are:

RH56D-PCI Data/Fax has a Device ID of 1033.

RH56D-PCI Data/Fax/Remote TAM has a Device ID of 1034.

RH56D-PCI/SP Data/Fax/Voice/Speakerphone has a Device ID of 1035.

Vendor ID Register

This mandatory 16-bit register identifies the manufacturer of the device. The value in this read-only register is assigned by a

central authority (i.e., the PCI SIG) that controls the issuance of the numbers. The value is 14F1 for Conexant.

Subsystem Vendor ID and Subsystem Device Register

The subsystem vendor ID is obtained from the SIG, while the vendor supplies its own subsystem device ID. These values are

supplied by OEM. Until these values are assigned, Conexant uses default values for Subsystem Vendor ID and Subsystem

Device ID which are the same as Vendor ID and Device ID, respectively.

A PCI functional device may be contained on a card or be embedded within a subsystem. Two cards or subsystems that use

the same PCI functional device core logic would have the same vendor and device IDs. These two optional registers are used

to uniquely identify the add-in card or subsystem that the functional device resides within. Software can then distinguish the

difference between cards or subsystems manufactured by different vendors but with the same PCI functional device on the

card or subsystem. A value of zero in these registers indicates that there isn’t a subsystem vendor and subsystem ID

associated with the device.

Min_Gnt Register

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

This register is optional for a bus master and not applicable to non-master devices. This register indicates how long the

master would like to retain PCI Bus ownership whenever it initiates a transaction. The value hardwired into this register

indicates how long a burst period the device needs (in increments of 250 ns). A value of zero indicates the device has no

stringent requirements in this area. This information is useful in programming the algorithm to be used in the PCI Bus arbiter

(if it is programmable).

Max_Lat Register

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

This register is optional for a bus master and not applicable to non-master devices. The specification states that this read-only

register specifies “how often” the device needs access to the PCI Bus (in increments of 250 ns). A value of zero indicates the

device has no stringent requirements for the data. This register could be used to determine the priority-level the bus arbiter

assigns to the master.

1213

Conexant

5-7

Conexant Proprietary Information

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