PM8621-BI PMC-Sierra, Inc., PM8621-BI Datasheet - Page 38

• Manufacturer Part Number: PM8621-BI
• Description: Driver, NSE/SBS Narrowband Chipset Driver
• Manufacturer: PMC-Sierra, Inc.

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Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2021248, Issue 1
S
This section of the manual describes the software architecture of the Narrowband Chipset device
driver. It includes a discussion of the driver’s external interfaces and its main components.
Driver External Interfaces
Figure 14, Figure 15, and Figure 16 illustrate the external interfaces defined for the Narrowband
Chipset device driver in different system configurations. The CSD can be initialized to work with
centralized, distributed or various other system configurations.
The interface between the CSD and the upper layer application is consistent regardless of
configuration. This is an attempt to present a unified interface to the upper layer regardless of
whether it is configured to run in a line card or a switch card. There are, of course, some API
functions and callbacks that are not available on the switch card or line card side when the
functionality does not belong. For instance, the switch card application cannot access PRGM
functionality that is provided by SBS devices. Below is a description of how the CSD adapts to
some typical system configurations
Figure 14: Driver External Interfaces – Typical Centralized Configuration
In a typical centralized configuration, all devices are under the control of a single microprocessor.
It is the most straightforward configuration since all devices, SBS, NSE, and other supporting
devices, are assumed to be under the control of a single microprocessor. The CSD can easily be
configured to accommodate such configuration.
OFTWARE
device
Driver
PHY
PHY
SBS device(s)
Driver Abstraction Layer (DAL)
SBS Driver
A
Function Calls
RCHITECTURE
System Application
Narrowband Chipset Driver
NSE device(s)
NSE Driver
Application Callbacls
Open Path Library
(OPA Lib)
Narrowband Chipset Device Driver Manual
System
System
Calls
Calls
Software Architecture
RTOS
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