COM20020D Datasheet, PDF (31/72 Pages) SMSC Corporation – ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM

DATA
0000 1000
0001 1000
COMMAND
Clear
Receive
Interrupt
Start Internal
Operation
DESCRIPTION
This command is used only in the Command Chaining operation.
Please refer to the Command Chaining section for definition of
this command.
This command restarts the stopped internal operation after
changing CKUP1 or CKUP0 bit.
BIT
BIT NAME
7 Read Data
6 Auto Increment
5-3 (Reserved)
2-0 Address 10-8
Table 7 - Address Pointer High Register
SYMBOL
DESCRIPTION
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.
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.
These bits are undefined.
A10-A8
These bits hold the upper three address bits which provide
addresses to RAM.
BIT
BIT NAME
7-0 Address 7-0
Table 8 - Address Pointer Low Register
SYMBOL
DESCRIPTION
A7-A0
These bits hold the lower 8 address bits which provide the
addresses to RAM.
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