IDT1893CFLF IDT, Integrated Device Technology Inc, IDT1893CFLF Datasheet - Page 41

• Manufacturer Part Number: IDT1893CFLF
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT1893CFLF

• Lead Free Status / RoHS Status: Compliant

6.6.2.5 Management Frame Register Address
6.6.2.6 Management Frame Operational Code
6.6.2.7 Management Frame Turnaround
6.6.2.8 Management Frame Data
6.6.2.9 Serial Management Interface Idle State
ICS1893CF, Rev. J, 08/11/09
Upon receiving a valid STA transaction, during a power-on or hardware reset an ICS1893CF compares the
PHYAD field included within the management frame with the value of its PHYAD bits stored in register 16.
(For information on the PHYAD bits, see
match its stored address bits.
A Management Frame includes a 5-bit register address field, REGAD. This field identifies which of the 32
Management Registers are involved in a transaction between an STA and a PHY.
A management frame includes a 2-bit operational code field, OP. If the operation code is a:
•
•
A valid management frame includes a turn-around field (TA), which is a 2-bit time space between the
REGAD field and the Data field. This time allows an ICS1893CF and an STA to avoid contentions during
read transactions. During an operation that is a:
•
•
A valid management frame includes a 16-bit Data field for exchanging the register contents between the
ICS1893CF and the STA. All Management Registers are 16 bits wide, matching the width of the Data field.
During a transaction that is a:
•
•
If the STA attempts to:
•
•
Note:
The MDIO signal is in an idle state during the time between STA transactions. When the Serial
Management Interface is in the idle state, the ICS1893CF disables (that is, tri-states) its MDIO pin, which
enters a high-impedance state. The ISO/IEC 8802-3 standard requires that an MDIO signal be idle for at
least one bit time between management transactions. However, the ICS1893CF does not have this
limitation and can support a continual bit stream on its MDIO signals.
Read, the REGAD field identifies the register used as the source of data returned to the STA by the
ICS1893CF.
Write, the REGAD identifies the destination register that is to receive the data sent by the STA to the
ICS1893CF.
Read, an ICS1893CF remains in the high-impedance state during the first bit time and subsequently
drives its MDIO pin to logic zero for the second bit time.
Write, an ICS1893CF waits while the STA transmits a logic one, followed by a logic zero on its MDIO pin.
Read, (OP is 10b) the ICS1893CF obtains the contents of the register identified in the REGAD field and
returns this Data to the STA synchronously with its MDC signal.
Write, (OP is 01b) the ICS1893CF stores the value of the Data field in the register identified in the
REGAD field.
Read from a non-existent ICS1893CF register, the ICS1893CF returns logic one for all bits in the Data
field, FFFFh.
Write to a non-existent ICS1893CF register, the ICS1893CF isolates the Data field of the management
frame from every reaching the registers.
ICS1893CF Data Sheet Rev. J - Release
The first Data bit transmitted and received is the most-significant bit of a Management Register, bit
X.15.
Copyright © 2009, Integrated Device Technology, Inc.
Table
All rights reserved.
7-16.) An ICS1893CF responds to all transactions that
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Chapter 6 Functional Blocks
August, 2009