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參數(shù)資料
| 型號(hào)： | AM79C976 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller |
| 中文描述： | PCnet -專(zhuān)業(yè)⑩個(gè)10/100Mbps PCI以太網(wǎng)控制器 |
| 文件頁(yè)數(shù)： | 239/309頁(yè) |
| 文件大?。?/td> | 2070K |
| 代理商： | AM79C976 |
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8/01/00
Am79C976
239
P R E L I M I N A R Y
The following tables describe the transmit descriptor
bits in more detail.
5)!*('D><%C4
5"!*(':><%C);
29
28
ADD_
FCS
Offset
31
30
27-26
25
24
23
22
21-18
17-16
15-0
00h
OWN
LTINT
STP
ENP
KILL
BCNT
04h
08h
0Ch
10h
14h
18h
1Ch
TCC[1:0]
TCI[15:0]
TBADR[31:0]
TBADR[63:32]
Reserved
USER SPACE
USER SPACE
USER SPACE
Offset
Bit
Name
Description
0
15-0
TBADR[15:0]
Transmit Buffer Address. This field contains the high order bits of the address of the
Transmit buffer that is associated with this descriptor.
2
15
OWN
This bit indicates whether the descriptor entry is owned by the host (OWN = 0) or by
the Am79C976 controller (OWN = 1). The host sets the OWN bit after filling the buffer
pointed to by the descriptor entry. The Am79C976 controller clears the OWN bit after
transmitting the contents of the buffer. Both the Am79C976 controller and the host
must not alter a descriptor entry after it has relinquished ownership.
2
14
Reserved location
.
2
13
ADD_FCS
ADD_FCS dynamically controls the generation of FCS on a frame by frame basis.
This bit should be set with the ENP bit. However, for backward compatibility, it is
recommended that this bit be set for every descriptor of the intended frame. When
ADD_FCS is set, the state of DXMTFCS is ignored and transmitter FCS generation is
activated. When ADD_FCS is cleared to 0, FCS generation is controlled by
DXMTFCS. When APAD_XMT (CSR4, bit 11) is set to 1, the setting of ADD_FCS has
no effect. ADD_FCS is set by the host, and is not changed by the Am79C976
controller. This is a reserved bit in the C-LANCE (Am79C90) controller.
2
12
LTINT
Last Transmit Interrupt. When enabled by the LTINTEN bit (CSR5, bit 14), LTINT is
used to suppress interrupts after selected frames have been copied to the transmit
FIFO. When LTINT is cleared to 0 and ENP is set to 1, the Am79C976 controller will
not set TINT (CSR0, bit 9) after the corresponding frame has been copied to the
transmit FIFO. TINT will only be set when the last descriptor of a frame has both LTINT
and ENP set to 1. When LTINTEN is cleared to 0, the LTINT bit is ignored.
2
11-10
Reserved.
2
9
STP
Start of Packet indicates that this is the first buffer to be used by the Am79C976
controller for this frame. It is used for data chaining buffers. The STP bit must be set
in the first buffer of the frame, or the Am79C976 controller will skip over the descriptor
and poll the next descriptor(s) until the OWN and STP bits are set. STP is set by the
host and is not changed by the Am79C976 controller.
2
8
ENP
End of Packet indicates that this is the last buffer to be used by the Am79C976
controller for this frame. It is used for data chaining buffers. If both STP and ENP are
set, the frame fits into one buffer and there is no data chaining. ENP is set by the host
and is not changed by the Am79C976 controller.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C976KIW | PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller |
| AM79C976KCW | PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller |
| AM79C978AKCW | Single-Chip 1/10 Mbps PCI Home Networking Controller |
| AM79C978AVCW | Single-Chip 1/10 Mbps PCI Home Networking Controller |
| AM79C978 | Single-Chip 1/10 Mbps PCI Home Networking Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C976KC | 制造商:Rochester Electronics LLC 功能描述:METRIC PLASTIC QUAD-RING - Bulk |
| AM79C976KCW | 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller |
| AM79C976KD | 制造商:Advanced Micro Devices 功能描述:ETHERNET:MEDIA ACCESS CONTROLLER (MAC) |
| AM79C976KF | 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP 制造商:AMD (Advanced Micro Devices) 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP |
| AM79C976KI | 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP 制造商:AMD (Advanced Micro Devices) 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP |
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