Marantz AV7701 Service Manual page 203

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
2.1 Pin Assignments
LAN8720A Pin Function
PIN NUM
1
2
3
4
5
6
7
8
9
10
11
12
LAN8720A Block Diagram
MODE[0:2]
nRST
RMIISEL
TXD[0:1]
TXEN
RXD[0:1]
RXER
CRS_DV
MDC
MDIO
Revision 1.3 (04-20-11)
SMSC LAN8720A/LAN8720Ai
Table 2.8 24-QFN Package Pin Assignments
PIN NAME
VDD2A
LED2/nINTSEL
LED1/REGOFF
XTAL2
XTAL1/CLKIN
VDDCR
10/100
LAN8720A/
RXD1/MODE1
RMII
Ethernet
LAN8720Ai
MAC
RXD0/MODE0
Mode
VDDIO
RXER/PHYAD0
CRS_DV/MODE2
MDIO
Figure 1.1 System Block Diagram
Mode Control
Auto-
Negotiation
Reset Control
Management
SMI
Control
100M RX
Logic
10M RX
Logic
LAN8720A/LAN8720Ai
Figure 1.2 Architectural Overview
DATASHEET
PIN NUM
13
14
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
15
16
17
18
19
MDI
Transformer
20
LED
21
22
Crystal or
Clock
23
Oscillator
24
100M TX 100M
Logic Transmitter
Transmitter
10M TX 10M
Logic Transmitter
Analog-to-
DSP System:
Digital
Clock
Data Recovery
Equalizer
100M PLL
Receiver
Squeltch
& Filters
10M PLL
8
15
DATASHEET
203
PIN NAME
MDC
nINT/REFCLKO
Datasheet
nRST
TXEN
TXD0
TXD1
VDD1A
RJ45
TXN
TXP
RXN
RXP
RBIAS
HP Auto-MDIX
TXP/TXN
RXP/RXN
MDIX
Control
XTAL1/CLKIN
PLL
XTAL2
Interrupt
nINT
Generator
LED1
LEDs
LED2
RBIAS
Central Bias
PHY Address
PHYAD0
Latches
SMSC LAN8720A/LAN8720Ai
Revision 1.3 (04-20-11)