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AM79C987 датащи(PDF) 9 Page - Advanced Micro Devices

номер детали AM79C987
подробное описание детали  Hardware Implemented Management Information Base (HIMIB) Device
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

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AMD
P R E L I M I N A R Y
9
Am79C987
Port (P) Register
Register (R) Register
Command (C) Port
Data (D) Port
C/
D = 1
Bank 0
Bank 1
Register
Register
0
31
0
31
0
31
Register
Bank 31
Port (or Bank)
Pointer
Register (or Attribute)
Pointer
000XXXXX
111XXXXX
C/
D = 0
17305B-4
..
..
..
..
..
..
..
..
..
..
..
..
..
..
..
..
.
Figure 1. Overview of HIMIB Register Definition
An exception to the normal Command/Data Port access
scheme, is the Status Register which is read directly by
reading only the C Port. This allows the Status Register
to be read directly, without the need to write to the
C Port.
Register Definition
In the following description, all bit fields are ordered
such that the left most bit is the most significant bit. Un-
used Port and Register Numbers are reserved and
should not be accessed as this may cause device mal-
function.
When specifying the Port or Bank Number, the following
command byte is written to the C Port:
C Port Write
MSB
LSB
0
0
0
P4
P3
P2
P1
P0
P[4:0] represent the Register Bank or Port Number.
These are organized as follows:
P = [P4P3P2P1P0]
Note that to access the P register the three most signifi-
cant bits of this byte must be zero.
P [4:0]
Port/Register Bank
0
Repeater Registers
1
Port Status Registers
2
Port Control Registers
16 – 23
Twisted Pair Ports Attributes
31
AUI Port Attributes
When specifying the Register or Attribute to be ac-
cessed, the following command byte is written to the
C Port.
C Port Write
MSB
LSB
1
1
1
R4
R3
R2
R1
R0
R = [R4R3R2R1R0]
Note that to access the R register the three most signifi-
cant bits of this byte must be one.


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