MTD800 データシートの表示（PDF） - Myson Century Inc
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MTD800 Datasheet PDF : 42 Pages
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MYSON
TECHNOLOGY
MTD 800
(Preliminary)
Once the packet has arrived in, the received data can be immediately transferred onto the dedicated location
of the host memory by means of the predefined address which contains in the third word of the descriptor.
After the receive buffer has been filled up with the received packet, the MTD800 clears the “own” bit in the
descriptor and issues an interrupt to notify the driver that the data in the buffer are ready to be taken away.
The MTD800 also has an advanced feature to boost the receiving process. That is so-called “receive early
interrupt” operation, which demands the driver to move the data earlier than the completion of receiving the
whole packet.
O
FLNG[10:0]
RSR1
RSR0
Reserved
RBS[10:0]
Rx Data Buffer Start Address
Next Descriptor Address
Figure 3.3 The Receive Descriptor Format
Table 3.3 Receive Descriptor 0 (RDES0)
Bit
31
30 - 28
27 - 16
15
14
13
12
11
10
9-8
Symbol
OWN
-
FLNG[11:0]
-
MAR
BAR
PHY
FSD
LSD
-
Descr iption
Owner : This bit is controlled by driver, When set, identifies that the
descriptor is owned by the MTD800. When reset, indicates that the
descriptor is owned by the host; Driver must reset this bit when initializa-
tion.
Reserved.
Frame Length : Indicates that the frame length of received packet. This
field is valid only when the descriptor contains the last segment of a
frame.
Receive Status Register 1( RSR1 )
Reserved.
Multicast Address Received : The MTD800 receives a multicast address
packet.
Broadcast Address Received : The MTD800 receives a broadcast address
packet.
Physical Address Received : The MTD800 receives a physical address
packet.
First Descriptor : When set, indicates that the descriptor contains the first
segment of a received frame.
Last Descriptor : When set, indicates that the descriptor contains the last
segment of a received frame.
Reserved.
Receive Status Register 0 ( RSR0)
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MTD800 Revision 0.0 07/20/1999
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