Cirrus-logic AN83 Bedienungsanleitung Seite 54
- Seite / 58
- Inhaltsverzeichnis
- LESEZEICHEN
Bewertet. / 5. Basierend auf Kundenbewertungen
AN83
54 AN83REV3
Maintaining EEPROM Information
The contents of the EEPROM may either be pre-
programmed in a stand-alone EEPROM program-
mer or programmed after installation through the
CS8900A’s serial interface. See the CS8900A
Data Sheet for programming an EEPROM via the
CS8900A’s serial interface. The OEM is left to de-
termine the best procedure for programming EE-
PROMs via a stand-alone EEPROM programmer.
Cirrus has two utilities suitable for maintaining the
configuration information stored in the EEPROM.
IAGEN.EXE generates a file with individual ad-
dresses and serial numbers. EEPROM.EXE is de-
signed to be used by OEMs to initialize the
EEPROM’s contents before shipping to the end-us-
er. It takes the file generated by IAGEN.EXE as in-
put. Both utilities are available as executables and
source code on request.
Cirrus also provides SETUP.EXE, a DOS-based
Setup and Installation Utility run by the end-user at
the time the adapter is installed. The DOS-based
Setup and Installation utility allows the end-user to
configure the adapter for a specific system.
Embedded Designs
Embedded designs may be implemented using an
on-board serial EEPROM connected to the
CS8900A in the same manner as is used in adapter
board designs. However, to save board space and
reduce costs, motherboard implementations can
store the Driver Configuration Block in the sys-
tem’s BIOS nonvolatile memory.
BIOS-Based Design Considerations
For Cirrus supplied MAC drivers to interface with
a Driver Configuration Block (DCB) stored in
BIOS, the DCB’s data structure must meet the fol-
lowing requirements:
3) The base of the data structure must be marked
by a header consisting of the 8-byte ASCII text
string “$CS8900A$”.
4) The header must be located on a 512-byte
boundary in the BIOS space between C0000h
and FFC00h.
5) The data structure must employ the same for-
mat as defined for EEPROM in Table 8.
An additional design consideration when storing
the Driver Configuration Block in BIOS space con-
cerns the inability to override the CS8900A’s de-
fault configuration after reset. If an EEPROM is
not connected to the CS8900A, it will always come
out of reset using its default configuration. There-
fore, when using BIOS space to store configuration
information, IO addresses of 300h - 310h must be
dedicated to the CS8900A.
The CS8900A’s configuration can be changed
from its default values through software control af-
ter reset. However, it will always revert to its de-
fault configuration after each reset (including
software resets). Refer to Table 3.3 of the CS8900A
Data Sheet for default configuration definitions.
Driver Interface with BIOS-Based Configu-
ration
During initialization, Cirrus-provided drivers test
for the presence of an EEPROM. If an EEPROM
is not detected, the drivers scan the BIOS for the
header indicating the start of a Driver Configura-
tion Block. Before using the data in the Driver
Configuration Block, the drivers verify the data in
the block is valid using a checksum.
The checksum stored at the end of the block is the
2’s complement of the 16-bit sum of all the words
in the Driver Configuration Block, excluding the 8
bytes of header. (The drivers access the Configura-
tion Block in BIOS space as 16-bit words.) Any
carry out of the 16th bit is ignored. Since this
checksum value is calculated as the 2’s comple-
ment of the sum of all the preceding words in the
block, a total of 0 should result when the checksum
value is added to the sum of the previous words.
Table 9 shows the correct format for a data struc-
- Application Note 1
- TABLE OF CONTENTS 2
- AN83REV3 3 3
- SCHEMATIC CHECKLIST 4
- SOFTWARE CHECKLIST 5
- INTRODUCTION TO CS8900A 6
- TECHNICAL REFERENCE MANUAL 6
- HARDWARE DESIGN 7
- BUS SYSTEMS 7
- The CS8900A Architecture 7
- CS8900A in I/O Mode 8
- CS8900A in Memory Mode 8
- DMA Interface of the CS8900A 8
- Address Generation 9
- Read and Write Signals 10
- SBHE Signal 10
- Other Control Signals 10
- Status Signals from CS8900A 11
- Databus (SD[0:15]) Connection 11
- EEPROM Optional 11
- Cirrus Logic CL-PS7211 12
- Hitachi SH3 12
- AN83REV3 13 13
- 14 AN83REV3 14
- AN83REV3 15 15
- CS8900 EVAL BOARD REV. B 16
- P/N CDB8900B 16
- CS8900 EVAL BOARD REV. C 17
- 10BASE-T Interface 18
- 10BASE-2 and AUI Interfaces 18
- Logic Schematics 18
- AN83REV3 19 19
- Bill of Material 20
- AN83REV3 21 21
- AN83REV3 23 23
- 24 AN83REV3 24
- AN83REV3 25 25
- AUI Interface 26
- AN83REV3 27 27
- 28 AN83REV3 28
- AN83REV3 29 29
- Memory Mode 31
- Lower Memory Mode 31
- Extended Memory Mode 31
- 32 AN83REV3 32
- Figure 23. PAL Program 34
- AN83REV3 39 39
- 40 AN83REV3 40
- AN83REV3 41 41
- 42 AN83REV3 42
- AN83REV3 43 43
- RECOMMENDED MAGNETICS FOR 44
- THE CS8900A 44
- JUMPERLESS DESIGN 45
- Serial EEPROM 45
- Reset Configuration Block 45
- Table 6. Transformer Vendors 46
- IEEE Physical Address 49
- ISA Configuration Flags 49
- PacketPage Memory Base 50
- Boot PROM Memory Base 50
- Boot PROM Mask 50
- Transmission Control 50
- Adapter Configuration Word 51
- EEPROM Revision 51
- Manufacturing Date 52
- IEEE Physical Address (Copy) 52
- 16-bit Checksum 52
- Serial Number 53
- Serial ID Checksum 53
- Embedded Designs 54
- OBTAINING IEEE ADDRESSES 55
- DEVICE DRIVERS AND 56
- SETUP/INSTALLATION SOFTWARE 56
- Installation Procedure 56
- CONTACTING CUSTOMER SUPPORT 57
- AT CIRRUS 57
- Cirrus Web Site 57
Verwandte Produkte und Handbücher für Hardware Cirrus-logic AN83
Hardware Cirrus-logic CS8900A Bedienungsanleitung
(138 Seiten)
(138 Seiten)
Hardware Cirrus-logic CS8952 Bedienungsanleitung
(12 Seiten)
(12 Seiten)
Hardware Cirrus-logic CS8952 Bedienungsanleitung
(81 Seiten)
(81 Seiten)
Hardware Cirrus-logic EP7309 Bedienungsanleitung
(42 Seiten)
(42 Seiten)
Hardware Cirrus-logic EP7311 Bedienungsanleitung
(42 Seiten)
(42 Seiten)
Hardware Cirrus-logic EP7312 Bedienungsanleitung
(54 Seiten)
(54 Seiten)
Hardware Cirrus-logic EP73xx Bedienungsanleitung
(158 Seiten)
(158 Seiten)
Hardware Cirrus-logic AN186 Bedienungsanleitung
(12 Seiten)
(12 Seiten)
Hardware Cirrus-logic AN187 Bedienungsanleitung
(12 Seiten)
(12 Seiten)
Hardware Cirrus-logic AN269 Bedienungsanleitung
(65 Seiten)
(65 Seiten)
LOEWE Spheros R 32 HD+ manuales
Manuales del propietario y guías del usuario para Televisores Lcd LOEWE Spheros R 32 HD+.
Ofrecemos 1 manuales en pdf LOEWE Spheros R 32 HD+ para descargar gratis por tipos de documentos: Manual de usuario
Kommentare zu diesen Handbüchern