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COM20020D датащи(PDF) 31 Page - SMSC Corporation

номер детали COM20020D
подробное описание детали  ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM
PDF  72 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM20020D датащи(HTML) 31 Page - SMSC Corporation

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31
DATA
COMMAND
DESCRIPTION
0000 1000
Clear
Receive
Interrupt
This command is used only in the Command Chaining operation.
Please refer to the Command Chaining section for definition of
this command.
0001 1000
Start Internal
Operation
This command restarts the stopped internal operation after
changing CKUP1 or CKUP0 bit.
Table 7 - Address Pointer High Register
BIT
BIT NAME
SYMBOL
DESCRIPTION
7
Read Data
RDDATA
This bit tells the COM20020D whether the following access
will be a read or write. A logic "1" prepares the device for a
read, a logic "0" prepares it for a write.
6
Auto Increment
AUTOINC
This bit controls whether the address pointer will increment
automatically.
A logic "1" on this bit allows automatic
increment of the pointer after each access, while a logic "0"
disables this function.
Please refer to the Sequential
Access Memory section for further detail.
5-3
(Reserved)
These bits are undefined.
2-0
Address 10-8
A10-A8
These bits hold the upper three address bits which provide
addresses to RAM.
Table 8 - Address Pointer Low Register
BIT
BIT NAME
SYMBOL
DESCRIPTION
7-0
Address 7-0
A7-A0
These bits hold the lower 8 address bits which provide the
addresses to RAM.



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