ICS1893 Datasheet, PDF (56/152 Pages) Integrated Circuit Systems – 3.3-V 10Base-T/100Base-TX Integrated PHYceiver™

ICS1893 Data Sheet - Release
Chapter 7 Functional Blocks
7.6 Functional Block: Management Interface
As part of the MAC/Repeater Interface, the ICS1893 provides a two-wire serial management interface
which complies with the ISO/IEC 8802-3 standard MII Serial Management Interface. This interface is used
to exchange control, status, and configuration information between a Station Management entity (STA) and
the physical layer device (PHY). The PHY and STA exchange this data through a pre-defined set of
management registers. The ISO/IEC standard specifies the following components of this serial
management interface:
• A set of registers (Section 7.6.1, “Management Register Set Summary”)
• The frame structure (Section 7.6.2, “Management Frame Structure”)
• The protocol
In compliance with the ISO/IEC specification, the ICS1893 implementation of the serial management
interface provides a bi-directional data pin (MDIO) along with a clock (MDC) for synchronizing the
exchange of data. These pins remain active in all ICS1893 MAC/Repeater Interface modes (that is, the
10/100 MII, 100M Symbol, and 10M Serial interface modes).
7.6.1 Management Register Set Summary
The ICS1893 implements a Management Register set that adheres to the ISO/IEC standard. This register
set (discussed in detail in Chapter 8, “Management Register Set”) includes the mandatory ‘Basic’Control
and Status registers and the ISO/IEC ‘Extended’registers as well as some ICS-specific registers.
7.6.2 Management Frame Structure
The Serial Management Interface is a synchronous, bi-directional, two-wire, serial interface for the
exchange of configuration, control, and status data between a PHY, such as an ICS1893, and an STA. All
data transferred on an MDIO signal is synchronized by its MDC signal. The PHY and STA exchange data
through a pre-defined register set.
The ICS1893 complies with the ISO/IEC defined Management Frame Structure and protocol. This structure
supports both read and write operations. Table 7-2 summarizes the Management Frame Structure.
Note: The Management Frame Structure starts from and returns to an IDLE condition. However, the
IDLE periods are not part of the Management Frame Structure.
Table 7-2. Management Frame Structure Summary
Acronym
PRE
SFD
OP
PHYAD
REGAD
TA
DATA
Frame Field
Frame Function
Preamble (Bit 1.6)
Start of Frame
Operation Code
PHY Address (Bits 16.10:6)
Register Address
Turnaround
Data
Data
Comment
11..11
32 ones
01
2 bits
10/01 (read/write) 2 bits
AAAAA
5 bits
RRRRR
5 bits
Z0/10 (read/write) 2 bits
DDD..DD
16 bits
ICS1893 Rev C 6/6/00
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
56
June, 2000