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TLK100_11 Datasheet, PDF (24/88 Pages) Texas Instruments – Industrial Temp, Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver
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TLK100
SLLS931B – AUGUST 2009 – REVISED DECEMBER 2009
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• ADDAR is the address/data MMD register. It is used in conjunction with REGCR to provide the access
to the extended register set. If register REGCR[15:14] 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.
4.2.1.1 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.
4.2.1.2 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.
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