參數(shù)資料
型號: 8502
英文描述: 8502 Ethernet MII to AUI Interface Adapter manual 7/97
中文描述: 8502以太網(wǎng)MII接口適配器的投資者聯(lián)盟手冊7 / 97
文件頁數(shù): 16/55頁
文件大小: 457K
代理商: 8502
8502
4-16
MD400157/D
3.18 Register Description
Table 2. MI Serial Port Frame Structure
<Idle>
IDLE
<Start>
ST[1:0]
<Read>
READ
<Write>
WRITE
<PHY Addr.>
PHYAD[4:0]
<Reg. Addr.>
REGAD[4:0]
<Turnaround>
TA[1:0]
<Data> ....
D[15:0]....
Register 0 Control
Register 1 Status
Register 2 PHY ID #1
Register 3 PHY ID #2
Register 16 Configuration
Symbol
IDLE
Name
Idle Pattern
Definition
These Bits Are an Idle Pattern. Device Will Not Initiate An MI
Cycle Until It Detects At Least 32 1's.
When ST[1:0]=01, A MI Serial Port Access Cycle Starts.
R/W
W
ST1
ST0
READ
WRITE
PHYAD[4:0]
Start Bits
W
Read Select
Write Select
Physical Device
Address
Register Address
1 = Read Cycle
1 = Write Cycle
When PHYAD[4:2]=000 and PHY[1:0]=MDA[1:0] Pins Inverted,
The MI Serial Port Is Selected For Operation.
If REGAD=00000-11111, These Bits Determine The Register From
Which D[15:0] Is Read/Written. If Multiple Register Access Is
Enabled And REGAD=11111, All Registers Are Read/Written.
These Bits Provide Some Turnaround Time For MDIO
W
W
W
REGAD[4:0]
W
TA1
TA0
Turnaround Time
R/W
When READ=1, TA[1:0]=Z0
When WRITE=1, TA[1:0]=ZZ
These 16 Bits Contain Data To/From One Of The Five Registers
Selected By Register Address Bits REGAD[4:0].
D[15:0]....
Data
Any
IDLE is shifted in first
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