TLK6002 Datasheet, PDF (42/96 Pages) Texas Instruments – Dual Channel 0.47Gbps to 6.25Gbps Multi-Rate Transceiver

TLK6002
SLLSE34 – MAY 2010
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The IEEE 802.3 Clause 22 specification defines many of the registers, and additional registers have been
implemented for expanded functionality.
Clause 22 Indirect Addressing:
The TLK6002 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’h8000 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’h8000 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.
Figure 2-17 and Figure 2-18 illustrate an example write transaction to Register 16’h8000 using indirect
addressing in Clause 22.
MDC
MDIO
0 1 0 1 ^PA[4:0]
5'h1E
1 _{0 16'h8000}
1
32 "1's"
Preamble
Start
Write
Code
PHY
Addr
REG
Addr
Turn
Around
Data
Idle
Figure 2-17. CL22 – Indirect Address Method – Address Write
MDC
MDIO
0 1 0 1 ^PA[4:0]
5'h1F
10
DATA
1
32 "1's"
Preamble
Start
Write
Code
PHY
Addr
REG
Addr
Turn
Around
Data
Idle
Figure 2-18. CL22 – Indirect Address Method – Data Write
Figure 2-19 and Figure 2-20 illustrate an example read transaction to read contents of Register 16’h8000
using indirect addressing in Clause 22.
MDC
MDIO
0 1 0 1 ^PA[4:0]
5'h1E
1 _{0 16'h8000}
1
32 "1's"
Preamble
Start
Write
Code
PHY
Addr
REG
Addr
Turn
Around
Data
Idle
Figure 2-19. CL22 – Indirect Address Method – Address Write
42
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