參數(shù)資料
型號(hào): 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): 163/168頁
文件大?。?/td> 943K
代理商: AM79C970
AMD
1-1030
Am79C970
Figure D3 shows the event flow for the two-interrupt method:
18220A-57
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 is swapped out, allowing a non-Etherenet
application to run.
S7A: Driver Interrupt Service
Routine executes
RETURN.
{
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
C10: ERP interrupt
is generated.
}
S8A: Interrupt latency.
Figure D3
.
LAPP Timeline for TWO-INTERRUPT Method
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