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參數(shù)資料
| 型號： | AM79C976 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller |
| 中文描述： | PCnet -專業(yè)⑩個10/100Mbps PCI以太網(wǎng)控制器 |
| 文件頁數(shù)： | 130/309頁 |
| 文件大小： | 2070K |
| 代理商： | AM79C976 |
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130
Am79C976
8/01/00
P R E L I M I N A R Y
#*4!!4
Offset 048h
CMD0 is a command-style register. All bits in this reg-
ister are cleared to 0 when the RST pin is asserted, be-
fore the serial EEPROM is read, and after a serial
EEPROM read error.
Table 42. CMD0: Command0 Register
Bit
Name
Description
31-16
RES
Reserved locations. Written as zeros and read as undefined.
15
VAL1
Value bit for byte 1. The value of this bit is written to any bits in the CMD0 register that correspond
to bits in the CMD0[14:8] bit map field that are set to 1.
14-13
RES
Reserved locations. Written as zeros and read as undefined.
12
RDMD
Receive Demand, when set, causes the Descriptor Management Unit to access the Receive
Descriptor Ring without waiting for the chain poll-time counter to expire.
11-9
RES
Reserved locations. Written as zeros and read as undefined.
8
TDMD
Transmit Demand, when set, causes the Buffer Management Unit to access the Transmit
Descriptor Ring without waiting for the poll-time counter to elapse. If TXON is not enabled, TDMD
bit will be reset and no Transmit Descriptor Ring access will occur.
If the TXDPOLL bit in CMD2 is set, the host processor must set TDMD each time it is ready for the
Am79C976 device to poll the Transmit Descriptor Ring. When TXDPOLL = 0, setting TDMD merely
hastens the Am79C976 controller
’
s next access to a Transmit Descriptor Ring Entry.
7
VAL0
Value bit for byte 0. The value of this bit is written to any bits in the CMD0 register that correspond
to bits in the CMD0[6:0] bit map field that are set to 1.
6
UINTCMD
User Interrupt Command. UINTCMD can be used by the host to generate an interrupt unrelated to
any network activity. Writing a 1 to this bit causes the UINT bit in the Interrupt Register to be set to
1, which in turn causes INTA to be asserted if interrupts are enabled.
UINTCMD is always read as 0.
5
RX_FAST_
SPND
Receive Fast Suspend. Setting this bit causes the receiver to suspend its activities as quickly as
possible without stopping in the middle of a frame reception. Setting RX_FAST_SPND does not
stop the DMA controller from transferring frame data from the receive FIFO to host memory.
If a frame is being received at the time that RX_FAST_SPND is set to 1, the reception of that frame
will be completed, but no more frames will be received until RX_FAST_SPND is cleared to 0.
After the receiver has suspended its activity, the RX_SUSPENDED bit in the Status register and
the Suspend Interrupt (SPNDINT) bit in the Interrupt register will be set, which will cause an
interrupt to occur if interrupts are enabled and the SPNDINTEN bit in the Interrupt Enable register
is set.
4
TX_FAST_SPND
Transmit Fast Suspend. Setting this bit causes the transmitter to suspend its activities as quickly
as possible without stopping in the middle of a frame transmission. Setting TX_FAST_SPND does
not stop the DMA controller from transferring frame data from host memory to the transmit FIFO.
If a frame is being transmitted at the time that TX_FAST_SPND is set to 1, the transmission of that
frame will be completed, but no more frames will be transmitted until TX_FAST_SPND is cleared
to 0.
After the transmitter has suspended its activity, the TX_SUSPENDED bit in the Status register and
the Suspend Interrupt (SPNDINT) bit in the INT0 register will be set, which will cause an interrupt
to occur if interrupts are enabled and the SPNDINTEN bit in the Interrupt Enable register is set.
相關(guān)PDF資料 |
PDF描述 |
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| 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 |
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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: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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