參數(shù)資料
型號(hào)： DM9161
廠商： Electronic Theatre Controls, Inc.
英文描述： 10/100 Mbps FAST ETHERNET PHYSICAL LAYER SINGLE CHIP TRANSCEIVER
中文描述： 10/100 Mbps快速以太網(wǎng)物理層單芯片收發(fā)器
文件頁(yè)數(shù)： 19/47頁(yè)
文件大小： 561K
代理商： DM9161
DM9161
10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver
Final 19
Version: DM9161-DS-F02
May 10,2002
Auto-Negotiation
(continued)
Auto-negotiation also provides a parallel detection
function for devices that do not support the Auto-
negotiation feature. During Parallel detection there is
no exchange of configuration information, instead, the
receive signal is examined. If it is discovered that the
signal matches a technology, supported by the
receiving device, a connection will be automatically
established using that technology. This allows devices,
which do not support Auto-negotiation but support a
common mode of operation, to establish a link.
7.2.7 MII Serial Management
The MII serial management interface consists of a data
interface, basic register set, and a serial management
interface to the register set. Through this interface it is
possible to control and configure multiple PHY devices,
get status and error information, and determine the
type and capabilities of the attached PHY device(s).
The DM9161 management functions correspond to MII
specification for IEEE 802.3u-1995 (Clause 22) for
registers 0 through 6 with vendor-specific registers
16,17, 18, 21, 22, 23 and 24.
In read/write operation, the management data frame is
64-bits long and starts with 32 contiguous logic one bits
(preamble) synchronization clock cycles on MDC. The
Start of Frame Delimiter (SFD) is indicated by a <01>
pattern followed by the operation code (OP):<10>
indicates Read operation and <01> indicates Write
operation. For read operation, a 2-bit turnaround (TA)
filing between Register Address field and Data field is
provided for MDIO to avoid contention. Following the
turnaround time, 16-bit data is read from or written onto
management registers.
7.2.8 Serial Management Interface
The serial control interface uses a simple two-wired
serial interface to obtain and control the status of the
physical layer through the MII interface. The serial
control interface consists of MDC (Management Data
Clock), and MDI/O (Management Data Input/Output)
signals.
The MDIO pin is bi-directional and may be shared by
up to 32 devices.
7.2.9 Management Interface - Read Frame Structure
32 "1"s
0
1
1
0
A4
A3
A0
R4
R3
R0
Z
0
Idle
Preamble
SFD
Op Code
PHY Address
Register Address
Turn Around
Data
Read
Idle
Write
MDC
MDIO Read
D15
D14
D1
D0
//
//
7.2.10 Management Interface - Write Frame Structure
32 "1"s
0
1
1
0
A4
A3
A0
R4
R3
R0
1
0
D15
D14
D1
D0
Idle
Preamble
SFD
Op Code
PHY Address
Register Address
Write
Turn Around
Data
Idle
MDC
MDIO Write
Figure 7-5
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