AM79C930VCW datasheet(159/161 Pages) AMD

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A-1

Am79C930

Typical Am79C930 System Application

APPENDIX A

Host

Computer

128K

Flash

128K

SRAM

Am79C930

Radio

or IR

Transceiver

PCMCIA

ISA PnP

Interface

20183A-1

Figure 1: Typical Am79C930 System Application

The

typical

Am79C930

application

contains

Am79C930 device, a Flash memory device (up to 128

Kbytes), an SRAM memory device (up to 128 Kbytes), a

network transceiver unit, and a host computer system

connected to the Am79C930 subsystem through either

the PCMCIA or ISA Plug and Play system bus.

The Flash memory device is used to store PCMCIA CIS

or ISA Plug and Play resource data, the network ID for

the subsystem and the IEEE 802.11 (draft), and the

Xircom Netwave MAC protocol firmware that will be

executed on the Am79C930 device’s embedded 80188

core. The SRAM will be used by both the device driver

and the Am79C930 80188 core for command and status

passing,

data

buffer

storage,

and

80188

core

variable space.

In addition to these hardware components, the

Am79C930 subsystem will require network application

software, a device driver, IEEE 802.11 (draft) MAC pro-

tocol firmware stored in the Flash device before power

up, and system configuration information (either

PCMCIA CIS or ISA Plug and Play Resource Data) that

is also stored in the Flash device before power up.

Note: The Am79C930 device allows an uninitialized

Flash memory device to be built into the Am79C930

subsystem and then to be programmed within the

Am79C930 subsystem. However, normal configuration

utilities present in the system must be disabled before

attempting this procedure.

The general function of the Am79C930 device is to pro-

vide the MAC layer functions for an IEEE 802.11 (draft)

or Xircom Netwave protocol network. The following sec-

tions give a description of the interaction of the

Am79C930 device with a device driver, the Am79C930

80188 core firmware, and the network.

Device Configuration

The PCMCIA pin is strapped in hardware to select either

PCMCIA or ISA Plug and Play mode of operation. In

either case, the host computer at system configuration

time (typically at system boot time) will read the configu-

ration information from the Am79C930 subsystem Flash

memory to determine the memory, I/O space, and inter-

rupt channel requirements of the subsystem.

After allocating a portion of system resources to the

Am79C930 subsystem, the device driver will be loaded.

The device driver will set up or reserve various areas of

the SRAM for the following purposes:

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