206
LAN8720A Pin Function
LAN8720A Block Diagram
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720A/LAN8720Ai
15
Revision 1.3 (04-20-11)
DATASHEET
2.1
Pin Assignments
Table 2.8 24-QFN Package Pin Assignments
PIN NUM
PIN NAME
PIN NUM
PIN NAME
1
VDD2A
13
MDC
2
LED2/nINTSEL
14
nINT/REFCLKO
3
LED1/REGOFF
15
nRST
4
XTAL2
16
TXEN
5
XTAL1/CLKIN
17
TXD0
6
VDDCR
18
TXD1
7
RXD1/MODE1
19
VDD1A
8
RXD0/MODE0
20
TXN
9
VDDIO
21
TXP
10
RXER/PHYAD0
22
RXN
11
CRS_DV/MODE2
23
RXP
12
MDIO
24
RBIAS
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.3 (04-20-11)
8
SMSC LAN8720A/LAN8720Ai
DATASHEET
Figure 1.1 System Block Diagram
Figure 1.2 Architectural Overview
LAN8720A/
LAN8720Ai
10/100
Ethernet
MAC
RMII
Mode
LED
Transformer
Crystal or
Clock
Oscillator
MDI
RJ45
R
M
II
Lo
gi
c
Interrupt
Generator
LEDs
PLL
Receiver
DSP System:
Clock
Data Recovery
Equalizer
Squeltch
& Filters
Analog-to-
Digital
10M RX
Logic
100M RX
Logic
100M PLL
10M PLL
Transmitter
10M
Transmitter
100M
Transmitter
10M TX
Logic
100M TX
Logic
Central Bias
PHY Address
Latches
LAN8720A/LAN8720Ai
RBIAS
LED1
nINT
XTAL2
XTAL1/CLKIN
LED2
Management
Control
Mode Control
Reset Control
MDIX
Control
HP Auto-MDIX
RXP/RXN
TXP/TXN
TXD[0:1]
TXEN
RXD[0:1]
RXER
CRS_DV
MDC
MDIO
Auto-
Negotiation
RMIISEL
nRST
MODE[0:2]
SMI
PHYAD0
Содержание AVR-4520
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