參數(shù)資料
型號(hào)： LAN8700
廠商： SMSC Corporation
英文描述： 【15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR TM in a Small Footprint
中文描述： 【15kV的ESD保護(hù)信息產(chǎn)業(yè)部/ RMII快速的HP Auto - MDIX功能和SMSC flexPWR商標(biāo)以太網(wǎng)PHY在小尺寸
文件頁(yè)數(shù)： 18/73頁(yè)
文件大?。?/td> 457K
代理商： LAN8700
±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR
TM
in a Small Footprint
Datasheet
Revision 1.0 (02-09-07)
18
SMSC LAN8700/LAN8700I
DATASHEET
Chapter 4 Architecture Details
4.1
Top Level Functional Architecture
Functionally, the PHY can be divided into the following sections:
100Base-TX transmit and receive
10Base-T transmit and receive
MII or RMII interface to the controller
Auto-negotiation to automatically determine the best speed and duplex possible
Management Control to read status registers and write control registers
Figure 4.1 100Base-TX Data Path
4.2
100Base-TX Transmit
The data path of the 100Base-TX is shown in
Figure 4.1
. Each major block is explained below.
4.2.1
100M Transmit Data Across the MII/RMII Interface
For MII, the MAC controller drives the transmit data onto the TXD bus and asserts TX_EN to indicate
valid data. The data is latched by the PHY’s MII block on the rising edge of TX_CLK. The data is in
the form of 4-bit wide 25MHz data.
The MAC controller drives the transmit data onto the TXD bus and asserts TX_EN to indicate valid
data. The data is latched by the PHY’s MII block on the rising edge of REF_CLK. The data is in the
form of 2-bit wide 50MHz data.
4.2.2
4B/5B Encoding
The transmit data passes from the MII block to the 4B/5B encoder. This block encodes the data from
4-bit nibbles to 5-bit symbols (known as “code-groups”) according to
Table 4.1
. Each 4-bit data-nibble
is mapped to 16 of the 32 possible code-groups. The remaining 16 code-groups are either used for
control information or are not valid.
MAC
Tx
Driver
MLT-3
Converter
NRZI
Converter
4B/5B
Encoder
Magnetics
CAT-5
RJ45
25MHz by
5 bits
NRZI
MLT-3
MLT-3
MLT-3
MLT-3
Scrambler
and PISO
125 Mbps Serial
MII
25MHz
by 4 bits
TX_CLK
(for MII only)
Ext Ref_CLK (for RMII only)
100M
PLL
MII 25 Mhz by 4 bits
or
RMII 50Mhz by 2 bits
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