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參數(shù)資料
| 型號： | W89C880F |
| 英文描述： | LAN Hub Controller |
| 中文描述： | 局域網(wǎng)集線器控制器 |
| 文件頁數(shù)： | 56/72頁 |
| 文件大小： | 731K |
| 代理商： | W89C880F |
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W89C840F
- 56 -
15
RE
Receive Error:
When
set
RE high, it indicates any one of the following events occurred:
R00[1] -- CRC error
R00[6] -- Late event
R00[7] -- Packet too long
R00[11] -- Runt Packet
This bit is valid only when
set
RFD (R00[9]) or RLD (R00[8]), i.e. the first or
the last descriptor of the current frame.
13:12
RDT
Receive Data Type
The RDT indicates the types of the packet received in the FIFO buffer. The
receive DMA make a copy of the bits C18/CNCR[11:10] and write them to the
bit field RDT when
compl etel y recei ves
the current frame
.
The types of received packet is as following:
00 -- Normal receive packet
01 -- Internal loopback packet
10 -- External loopback
11 -- Reserved
This bit is valid only when
set
RFD (R00[9]) or RLD (R00[8]), i.e. the first or
the last descriptor of the current frame.
11
RP
Runt Packet :
When set, it indicates that the received packet length is less than 64 bytes. This
bit is valid only when
set
RFD (R00[9]) or RLD (R00[8]), i.e. the first or the
last descriptor of the current frame.
10
MP
Multicast Packet :
When set, it indicates that the received packet has a multicast address. This bit is
valid only when
set
RFD (R00[9]) or RLD (R00[8]).
9
RFD
First Descriptor.
When set, it indicates that this descriptor is the first descriptor of the current
packet. The RFD is valid on each descriptor of the current receive frame.
8
RLD
Last Descriptor.
When set, it indicates that this descriptor is the last descriptor of the current
packet. The RLD is valid on each descriptor of the current receive frame.
When both RFD and RLD are high, It means that the current receive frame is
described by a single descriptor.
When both RFD and RLD are low, it means that the current descriptor is neither
the first nor the last descriptor of the current frame.
When RFD is high and RLD is low, it means that the current descriptor is the
first descriptor of the current frame.
When RFD is low and RLD is high, it means that the current descriptor is the
last descriptor of the current frame.
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