TLK105 Datasheet, PDF (22/99 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer Transceiver

TLK105
TLK106
SLLSEB8A – AUGUST 2012 – REVISED MARCH 2013
www.ti.com
4.3.1 Extended Address Space Access
The TLK10x SMI function supports read/write access to the extended register set using registers
REGCR(0x000Dh) and ADDAR(0x000Eh) and the MDIO Manageable Device (MMD) indirect method
defined in IEEE802.3ah Draft for clause 22 for accessing the clause 45 extended register set.
Accessing the standard register set, MDIO registers 0 to 31, can be performed using the normal direct
MDIO access or the indirect method, except for register REGCR(0x000Dh) and ADDAR(0x000Eh) which
can be accessed only using the normal MDIO transaction. The SMI function will ignore indirect accesses
to these registers.
REGCR(0x000Dh) is the MDIO Manageable MMD access control. In general, register REGCR(4:0) is the
device address DEVAD that directs any accesses of ADDAR(0x000Eh) register to the appropriate MMD.
Specifically, the TLK10x uses the vendor specific DEVAD[4:0] = "11111" for accesses. All accesses
through registers REGCR and ADDAR should use this DEVAD. Transactions with other DEVAD are
ignored. REGCR[15:14] holds the access function: address (00), data with no post increment (01), data
with post increment on read and writes (10) and data with post increment on writes only (11).
• ADDAR is the address/data MMD register. ADDAR is used in conjunction with REGCR to provide the
access to the extended register set. If register REGCR[15:1] is 00, then ADDAR holds the address of
the extended address space register. Otherwise, ADDAR holds the data as indicated by the contents
of its address register. When REGCR[15:14] is set to 00, accesses to register ADDAR modify the
extended register set address register. This address register should always be initialized in order to
access any of the register within the extended register set.
• When REGCR[15:14] is set to 01, accesses to register ADDAR access the register within the extended
register set selected by the value in the address register.
• When REGCR[15:14] is set to 10, access to register ADDAR access the register within the extended
register set selected by the value in the address register. After that access is complete, for both reads
and writes, the value in the address register is incremented.
• When REGCR[15:14] is set to 11, access to register ADDAR access the register within the extended
register set selected by the value in the address register. After that access is complete, for write
accesses only, the value in the address register is incremented. For read accesses, the value of the
address register remains unchanged.
The following sections describe how to perform operations on the extended register set using register
REGCR and ADDAR.
4.3.1.1 Write Address Operation
To set the address register:
1. Write the value 0x001F (address function field = 00, DEVAD = 31) to register REGCR.
2. Write the desired register address to register ADDAR.
Subsequent writes to register ADDAR (step 2) continue to write the address register.
4.3.1.2 Read Address Operation
To read the address register:
1. Write the value 0x001F (address function field = 00, DEVAD = 31) to register REGCR.
2. Read the register address from register ADDAR.
Subsequent reads to register ADDAR (step 2) continue to read the address register.
22
Interfaces
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: TLK105 TLK106