參數(shù)資料
型號: AM79C974
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: PCnetTM -的SCSI結(jié)合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù): 67/153頁
文件大?。?/td> 838K
代理商: AM79C974
P R E L I M I N A R Y
AMD
67
Am79C974
accept writes to the APROM offsets within the
Am79C974 I/O resources map. Startup code in the sys-
tem BIOS can perform the PCI configuration accesses,
the IESRWE bit write, and the APROM writes.
Direct Access to the Microwire Interface
The user may directly access the Microwire port through
the EEPROM register, BCR19. This register contains
bits that can be used to control the Microwire interface
pins. By performing an appropriate sequence of I/O ac-
cesses to BCR19, the user can effectively write to and
read from the EEPROM. This feature may be used by a
system configuration utility to program hardware con-
figuration information into the EEPROM.
EEPROM-Programmable Registers
The following registers contain configuration informa-
tion that will be programmed automatically during the
EEPROM read operation:
1. I/O offsets 0h – Fh
2. BCR2
APROM locations
Miscellaneous Configuration
register
not used in the Am79C974
controller
not used in the Am79C974
controller
Burst Size and Bus Control
Register
Not Used
3. BCR16
4. BCR17
5. BCR18
6. BCR21
If the PREAD bit (BCR19) is reset to ZERO and the
PVALID bit (BCR19) is reset to ZERO, then the
EEPROM read has experienced a failure and the con-
tents of the EEPROM programmable BCR register will
be set to default H_RESET values. The content of the
APROM locations, however, will not be cleared.
Note that accesses to the APROM I/O locations do not
directly access the Address EEPROM itself. Instead,
these accesses are routed to a set of shadow registers
on board the Am79C974 controller that are loaded with
a copy of the EEPROM contents during the automatic
read operation that immediately follows the H_RESET
operation.
相關(guān)PDF資料
PDF描述
AM79C974KCW PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
AM79C975 PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
AM79C973 PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
AM79C973KCW PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
AM79C975KCW PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C974KC 制造商:Advanced Micro Devices 功能描述:
AM79C974KC/W 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Node Controller
AM79C974KCW 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
AM79C975 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY