DM9620 DAVICOM [Davicom Semiconductor, Inc.], DM9620 Datasheet - Page 52

• Manufacturer Part Number: DM9620
• Description: USB2.0 to 10/100M Fast Ethernet Controller
• Manufacturer: DAVICOM [Davicom Semiconductor, Inc.]

7.2 Ethernet Functional Description
7.2.1 Serial Management Interface
Management Interface - Read Frame Structure
Management Interface - Write Frame Structure
7.2.2 100Base-TX Operation
The block diagram in figure 3 provides an overview of
the functional blocks contained in the transmit
section.
The transmitter section contains the following
functional blocks:
- 4B5B Encoder
- Scrambler
- Parallel to Serial Converter
Preliminary
Version: DM9620 -15-DS-P02
February 20, 2012
MDIO Read
MDIO Write
DM9620
MDC
MDC
Idle
Idle
Preamble
Preamble
32 "1"s
32 "1"s
MDIO
MDC
0
0
SFD
SFD
1
1
1
Op Code
0
Op Code
External PHY can be accessed via the MDC, MDIO
0
1
Write
MDC
MDIO
A4
A4
PHY Address
PHY Address
A3
A3
A0
A0
Write
PHY
R4
R4
Register Address
Register Address
- NRZ to NRZI Converter
- NRZI to MLT-3
- MLT-3 Driver
7.2.3 4B5B Encoder
The 4B5B encoder converts 4-bit (4B) nibble data
generated by the MAC Reconciliation Layer into a
5-bit (5B) code group for transmission, reference
R3
R3
R0
R0
Z
Turn Around
Turn Around
1
USB2.0 to Fast Ethernet Controller
0
0
D15
D15
D14
D14
Read
Data
Data
//
D1
D1
D0
DM9620
D0
Idle
Idle
//
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