2.7.35 Clause 22 Indirect Addressing; Cl45 - Management Interface Extended Space Read Timing; Cl45 - Management Interface Extended Space Read And Increment Timing; Cl22 - Management Interface Read Timing - Texas Instruments TLK3134 Data Manual

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MDC
MDIO
32 "1's"
Preamble
Figure 2-35. CL45 – Management Interface Extended Space Read And Increment Timing
MDC
MDIO
32 "1's"
Preamble
Note that the 1 in the Turn Around section is externally pulled up, and driven to Z by TLK3134
MDC
MDIO
32 "1's"
Preamble
The IEEE 802.3 Clause 22/45 specification defines many of the registers, and additional registers have
been implemented for expanded functionality.

2.7.35 Clause 22 Indirect Addressing

TLK3134 Register space is divided into 3 register groups. First register group that can be addressed only
through Clause 45, second register group that can be addressed only through Clause 22 and third register
group that can be addressed through both clause 45 and clause 22. Third register group which can be
addressed through both clause 45 and clause 22 are implemented in vendor specific register space
(16'h9000 onwards). This register space can be accessed directly using clause 45 addressing method.
Due to clause 22 register space limitations, an indirect addressing method is implemented so that this
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 content register (Reg 31, 5'h1F) to access the contents of the address
specified in address control register. Following timing diagrams illustrate an example write transaction to
Register 16'h9000 using indirect addressing in Clause 22.
Copyright © 2007–2009, Texas Instruments Incorporated
0 0 1 0
Read Inc
Start
Code
1 1
0 0
Read
Start
Code
Figure 2-36. CL22 – Management Interface Read Timing
0 1 0 1
Write
Start
Code
Figure 2-37. CL22 - Management Interface Write Timing
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SLLS838F – MAY 2007 – REVISED DECEMBER 2009
PA0
PA4 DA4 DA0
PHY Dev
Addr Addr
PA0
PA4
DA4 DA0
PHY REG
Addr Addr
PA [4:0]
RA 4 RA 0
PHY REG
Addr Addr
TLK3134
Pu1
1
0
D15 D0
Turn
Data
Around
Pu1
1
0 D15 D0
Turn
Around
Data
1
0 D15 D0
Turn
Data
Around
Detailed Description
TLK3134
Idle
Idle
1
Idle
49