AM79C875KI AMD (ADVANCED MICRO DEVICES), AM79C875KI Datasheet - Page 24

• Manufacturer Part Number: AM79C875KI
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C875KI

• Lead Free Status / RoHS Status: Not Compliant

Bad Management Frame Handling
The management block of the device can recognize
management frames without preambles (preamble
suppression). However, if it receives a bad manage-
ment frame, it will go into a Bad Management Frame
state. It will stay in this state and will not respond to any
management frame without preambles until a frame
with a full 32-bit preamble is received, then it will return
to normal operation.
A bad management frame is a frame that does not
comply with the IEEE standard specification. It can be
one with less than 32-bit preamble, with illegal OP field,
etc. However, a frame with more than 32 preamble bits
is considered to be a good frame.
24
MDIO
(STA)
MDC
(PHY)
MDIO
(STA)
MDIO
MDC
z
Idle
z
z
Idle
z
0
Start
0
Start
1
1
Opcode
(Write)
0
Opcode
(Read)
1
1
0
Figure 9. PHY Management Read and Write Operations
1
1
PHY Address
16h, Port 2
0
PHY Address
16h, Port 2
0
1
1
1
1
0
0
0
Register Address
MII Control, 0h
0
Register Address
0
MII Status, 1h
0
0
0
0
0
0
Am79C875
1
z
z
Write Operation
Read Operation
1
TA
z
TA
0
0
0
0
1
1
Address (in
1
decimal)
Register
1
25-31
Table 5. NetPHY™ 4LP MII Management
8-15
0
16
17
18
19
20
21
22
23
24
0
0
1
2
3
4
5
6
7
0
0
0
0
0
Register Data
0
Register Data
Reserved
Reserved
1
MII Management Control Register
MII Management Status Register
PHY Identifier 1 Register
PHY Identifier 2 Register
Auto-Negotiation Advertisement Register
Auto-Negotiation Link Partner Ability
Register
Auto-Negotiation Expansion Register
Next Page Advertisement Register
Reserved
Miscellaneous Features Register
Interrupt Control/Status Register
Diagnostic Register
Test Register
Miscellaneous Features 2
Receiver Error Counter
Mode Control Register
Reserved
0
0
0
Register Set
0
1
0
0
0
0
0
Description
0
0
0
0
0
0
1
Idle
z
z
Idle
z
z
22236G-11