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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)： | 64/153頁 |
| 文件大?。?/td> | 838K |
| 代理商： | AM79C974 |
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AMD
P R E L I M I N A R Y
64
Am79C974
Hardware Access
PCnet-SCSI Controller Master Accesses
The Am79C974 controller has a bus interface compat-
ible with PCI specification revision 2.0.
Complete descriptions of the signals involved in bus
master transactions for each mode may be found in the
pin description section of this document. Timing dia-
grams for master accesses may be found in the block
description section for the Bus Interface Unit. This sec-
tion simply lists the types of master accesses that will be
performed by the Am79C974 controller with respect to
data size and address information.
The Am79C974 controller will support master accesses
only to 32-bit peripherals. The Am79C974 controller
does not support master accesses to 8-bit or 16-bit
memory. The Am79C974 controller is not compatible
with 8-bit systems, since there is no mode that supports
Am79C974 controller accesses to 8-bit peripherals.
Table 3 describes all possible bus master accesses that
the Am79C974 controller will perform. The right most
column lists all operations that may execute the given
access:
Table 3. Bus Master Accesses
Access
Mode
BE
[3:0]
Operation
4-byte read
Read
0000
descriptor read
or initialization block read
or transmit data buffer read
4-byte write
Write
0000
descriptor write
or receive data buffer write
3-byte write
Write
1000
receive data buffer write
3-byte write
Write
0001
receive data buffer write
2-byte write
Write
1100
receive data buffer write
2-byte write
Write
1001*
receive data buffer write
2-byte write
Write
0011
receive data buffer write
1-byte write
Write
1110
receive data buffer write
1-byte write
Write
1101*
receive data buffer write
1-byte write
Write
1011*
receive data buffer write
1-byte write
Write
0111
descriptor write
or receive data buffer write
* Cases marked with an asterisk represent extreme boundary conditions that are the result of programming one- and two-byte
buffer sizes, and therefore will not be seen under normal circumstances.
Note that all Am79C974 controller master read opera-
tions will always activate all byte enables. Therefore, no
one-, two- or three-byte read operations are indicated in
the table.
In the instance where a transmit buffer pointer address
begins on a non-DWORD boundary, the pointer will be
truncated to the next DWORD boundary address that
lies below the given pointer address and the first read
access from the transmit buffer will be indicated on the
byte enable signals as a four-byte read from this ad-
dress. Any data from byte lanes that lie outside of the
boundary indicated by the buffer pointer will be dis-
carded inside of the Am79C974 controller. Similarly, if
the end of a transmit buffer occurs on a non-DWORD
boundary, then all byte lanes will be indicated as active
by the byte enable signals, and any data from byte lanes
that lie outside of the boundary indicated by the buffer
pointer will be discarded inside of the Am79C974
controller.
Slave Access to I/O Resources
The Am79C974 device is always a 32-bit peripheral on
the system bus. However, the width of individual soft-
ware resources on board the Am79C974 controller may
be either 16-bits or 32-bits. The Am79C974 controller
I/O resource widths are determined by the setting of the
DWIO bit as indicated in the following table:
Am79C974
Controller I/O
DWIO Setting Resource Width Example Application
DWIO = 0
16-bit
Existing PCnet-ISA
driver that assumes
16-bit I/O mapping
and 16-bit resource
widths
DWIO = 1
32-bit
New drivers written
specifically for the
Am79C974 controller
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 |
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