NWK914D
NWK914D
PHY/PMD High Speed Copper Media Transceiver
Preliminary Information
DS4829 - 1.1 December 1997
The NWK914D is a Physical Layer device designed for
use in 100BASE-TX applications. The NWK914D has
integrated the 100mb/s transceiver, clock and data recovery
and NRZI conversion circuitry. It is designed for use in cost
effective NIC adapter cards and 100BASE-TX repeater and
switch applications.
The device connects through a 5 bit symbol interface
directly with any MAC controller that includes the PCS layer,
resulting in a simple and cost effective solution. It will also
interface with a PCS device such as the NWK935 to form a
complete 100BASE-TX Physical Layer for connection to the
IEEE 802.3 standard MII interface.
TTLGND
N/C
1
2
3
4
5
6
7
8
9
39 TTLGND
TEST
38
N/C
RXC
SDT
TESTIP
N10/100
37
36
35 LBEN
34 TDLV
RDLV
CC
CC
33 TXOE
32
N/C
N/C
TXPLLV
CC
RXPLLGND
31 LFTA
LFRB 10
LFRA 11
30
LFTB
29 TXPLLGND
RXPLLV
12
28
BGAPGND
SUBGND
CC
CC
RXV
13
27
FEATURES
■ Compatible with IEEE-802.3 Standards
■ Operates over 100 Meters of STP and Category 5
UTP cable
■ Five Bit TTL Level Symbol Interface
■ Integrated Clock and Data Recovery
■ Supports Full-duplex Operation
■ Integral 10 Mb/s Buffer for Dual 10 Mb/s & 100 Mb/s
Applications
GP52
Fig.1 Pin connections - top view
■ Single +5V supply
■ Adaptive Equalization
■ 52 Pin PQFP package
■ 25MHz to 125MHz Transmit Clock Multiplier
■ Programmable TX Output Current
■ Base Line Wander Correction
ORDERING INFORMATION
NWK914D/CG/GP1N
MII
Symbol
Interface
Interface
MAC or
Repeater
Controller
IC
NWK935
100 PCS
Isolation
Magnetics
NWK914D
RJ-45
Fig.2 Simplified system diagram
1