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參數(shù)資料
| 型號： | AM79C970 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus |
| 中文描述： | PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線 |
| 文件頁數(shù)： | 158/168頁 |
| 文件大小： | 943K |
| 代理商： | AM79C970 |
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AMD
1-1025
Am79C970
18220A-55
Buffer
#1
Ethernet
Controller
activity:
Software
activity:
Buffer
#2
Buffer
#3
S0: Driver is idle.
C1: Controller is performing intermittent
bursts of DMA to fill data buffer #1.
Ethernet
Wire
activity:
N0: Packet preamble, SFD
and destination address
are arriving.
C3: SRP interrupt
is generated.
C2: Controller writes descriptor #1.
C5: Controller is performing intermittent
bursts of DMA to fill data buffer #2.
S1: Interrupt latency.
S3: Driver writes modified application
pointer to descriptor #3.
S2: Driver call to application to
get application buffer pointer.
C8: Controller is performing intermittent
bursts of DMA to fill data buffer #3.
N1: 64th byte of packet
data arrives.
{
S4: Driver copies data from buffer #1 to the application buffer.
} {
S5: Driver polls descriptor #2.
S7: Driver polls descriptor of buffer #3.
S8: Driver calls application
to tell application that
packet has arrived.
S6: Driver copies data from buffer #2 to the application buffer.
C9: Controller writes descriptor #3.
C0: Lookahead to descriptor #2.
S9: Application processes packet, generates TX packet.
S10: Driver sets up TX descriptor.
p
C4: Lookahead to descriptor #3 (
OWN
).
}
C6: "Last chance" lookahead to
descriptor #3 (OWN).
C7: Controller writes descriptor #2.
N2: EOM
Figure D1
.
LAPP Timeline
LAPP Software Requirements:
Software needs to set up a receive ring with descriptors
formed into groups of 3. The first descriptor of each
group should have OWN = 1 and STP = 1, the second
descriptor of each group should have OWN = 1 and STP
= 0. The third descriptor of each group should have
OWN = 0 and STP = 0. The size of the first buffer (as in-
dicated in the first descriptor), should be at least equal to
the largest expected header size; however, for maxi-
mum efficiency of CPU utilization, the first buffer size
should be larger than the header size. It should be equal
to the expected number of message bytes, minus the
time needed for Interrupt latency and minus the applica-
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C970A | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product |
| AM79C970AKC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product |
| AM79C970AKC\\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Advanced Micro Devices 功能描述: |
| AM79C970AKC\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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