參數(shù)資料
型號： W89C840F
英文描述： LAN NODE CONTROLLER
中文描述： 網(wǎng)絡(luò)節(jié)點控制器
文件頁數(shù)： 13/72頁
文件大小： 731K
代理商： W89C840F
W89C840F
Publication Release Date:April 1997
Revision A1
- 13 -
status register
structure constructing register
data buffer 1 pointer
next descriptor pointer
first descritpor of the RX descriptor
data buffer 1
status register
structure constructing register
data buffer 1 pointer
next descriptor pointer
second descritpor of the RX descriptor
status register
structure constructing register
data buffer 1 pointer
next descriptor pointer
third descritpor of the RX descriptor
status register
structure constructing register
data buffer 1 pointer
data buffer 2 pointer
last descritpor of the RX descriptor
for storing the first RX packet data
data buffer 1
for storing the 3rd RX packet data
data buffer 1
for storing the nth RX packet data
data buffer 2
for storing the nth RX packet data
data buffer 1
for storing the 2nd RX packet data
data buffer 2
for storing the 2nd RX packet data
skip length between descriptors
As shown by the above diagram, the descriptors construct a mixed structure. Each descriptor with
the chain structure can
l i nk to onl y one data buffer i n whi ch
the last 32 bits are treated as the next
descriptor pointer. When the RLINK bit of the current descriptor, other than the last descriptor in the
descriptor list, is reset to low and this descriptor is programmed to be a ring structure, the current descriptor
can point to two data buffers
,
and the skip length between descriptor is used to point to the next descriptor
starting address.
In the last descriptor in the descriptor list, the R03 register will be used to designate the base address
of the data buffer 2 while the RLINK bit of the last descriptor is reset to low, but will be ignored if the
RLINK bit of the last descriptor is set to high. That is, if the last descriptor is a ring structure, it acts as a
ring and vice versa.
The next descriptor field of the last descriptor will be the starting address of the first descriptor, no
matter what the value of the RLINK bit of the last descriptor is low or high.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W89C841D 制造商:WINBOND 制造商全稱:Winbond 功能描述:3-IN - 1 10/100M FAST ETHERNET CONTROLLER
W89C841F 制造商:WINBOND 制造商全稱:Winbond 功能描述:3-IN - 1 10/100M FAST ETHERNET CONTROLLER
W89C841F/D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3-IN-1 100BASE-TX/FX & 10BASE-T Ethernet Controller
W89C880F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Hub Controller
W89C92 制造商:WINBOND 制造商全稱:Winbond 功能描述:PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER
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