TLK3132 Datasheet, PDF (32/103 Pages) Texas Instruments – 2-Channel Multi-Rate Transceiver

TLK3132
2-Channel Multi-Rate Transceiver
SLLS956 – DECEMBER 2008
MDC
MDIO
Pu1
0
1
1
0 ^{PA4 PA0} RA4 RA0
0 D15 D0
32 "1's"
Preamble
Start
Read
Code
PHY
Addr
REG
Addr
Turn
Around
Data
(1) Note that the 1 in the Turn Around section is externally pulled up, and driven to Z by the TLK3132
Figure 2-22. CL22 – Management Interface Read Timing⁽¹⁾
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1
Idle
MDC
MDIO
32 "1's"
Preamble
0
1
Start
0
1
Write
Code
PA [4:0]
RA 4 RA 0 1
0
D15 D0
1
PHY
REG
Turn
Addr
Addr
Around
Data
Idle
Figure 2-23. CL22 - Management Interface Write Timing
The IEEE 802.3 Clause 22 specification defines many of the registers, and additional registers have been
implemented for expanded functionality.
2.7.20 Clause 22 Indirect Addressing
The TLK3132 Register space is divided into two register groups. One register group can be addressed
directly through Clause 22, and one register group can be addressed indirectly through Clause 22. The
register group which can be addressed through Clause 22 indirectly is implemented in vendor specific
register space (16’h9000 onwards). Due to Clause 22 register space limitations, an indirect addressing
method is implemented so that this extended register space can be accessed through Clause 22. To
access this register space (16’h9000 onwards), an address control register (Reg 30, 5’h1E) should be
written with the register address followed by a read/write transaction to address data register (Reg 31,
5’h1F) to access the contents of the address specified in address control register. The following timing
diagrams illustrate an example write transaction to Register 16’h9000 using indirect addressing in Clause
22.
MDC
MDIO
0
1
0
1
PA [4:0]
5 'h1 E
1
0 16 'h9000
1
32 "1's"
Preamble
Start
Write
Code
PHY
REG
Turn
Addr
Addr
Around
Data
Idle
Figure 2-24. CL22 – Indirect Address Method – Address Write
MDC
MDIO
0
1
0
1
PA [4:0]
5 'h1 F
1
0
DATA
1
32 "1's"
Preamble
Start
Write
Code
PHY
REG
Turn
Data
Idle
Addr
Addr
Around
Figure 2-25. CL22 – Indirect Address Method – Data Write
32
Detailed Description
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