|
|
Part: MTD214
Category:
Communication
-> Network
-> Ethernet/DS1/E1 (T1/E1)
Description: 10M Ethernet Twisted PaIR Mau
Company: Myson Technology
Datasheet: Download MTD214 datasheet File size : 32 kB
Request For quote: Find where to buy MTD214
Datasheet text preview:
MYSON TECHNOLOGY
MTD214
Ethernet Encoder/Decoder and 10BaseT Transceiver with Built-in Waveform Shaper
FEA TURES
· · · · · · · · · ·
Compatible with IEEE 802.3 standards. Built-in UTP output waveform shaping function. Selectable media interface and auto-detection functions. Automatic polarity detection and correction. Link status output. Heartbeat disable/enable selection. Support full-duplex operation. Standard 802.3 AUI interface. Selectable controller interface. Low power consumption.
GENERA L DESCRIPTION
MTD214 contains integrated functions of the Ethernet encoder/decoder and UTP/AUI interface. The encoder/decoder conforms to IEEE 802.3 protocol and performance requirements while also retaining compatibility with most popular network controllers. The UTP transceiver has a built-in waveform shaping function thus eliminating the requirement of an external filter. The transceiver also contains the functions of automatic media selection and polarity correction. MTD214 is available in 28-pin plastic DIP (600mil) or SOJ (300mil) packages.
B L OCK DIAGRAM
VCO/PLL
2
AUI
2 2
DIP/DIN CIP/CIN DOP/DON
CRS RXC RXD COL/HBE
MANCHESTER DECODER
UTP RECEIVE
2
TPIP/TPIN
TXE TXD TXC
MANCHESTER ENCODER
LINK TEST/ JABBER
LTE/LS
NIS CIS FDX
CONTROL
UTP TRANSMIT
X1 X2
REFERENCE CLOCK
OUTPUT DRIVER
2
TPOP/ TPON
This datasheet contains new product information. Myson Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. MTD214 Revision 1.4 1205/1997 1/11
MYSON TECHNOLOGY
1.0 CONNECTION DIAGRAM
MTD214
2.0 PIN DESCRIPTIONS
Nam e GNDA VDDA COL/HB E I/O P P I/O Pi n # 1 2 3 Des c r i p t i o n s Ground for analog and internal circuits. +5V (+/-5%) supply for internal circuits. Collision detection output connecting to the network controller. This pin is also an input pin that determines the heartbeat function. During reset period, COL output is disabled, and input is latched to control the heartbeat function. After reset, COL is asserted when a collision is sensed on the network, during heartbeat period or jabber condition. Receives data output connecting to the network controller. RXD is the decoded NRZ data from the network. Carrier sense output connecting to the network controller. CRS is asserted when there is activity on the media, and is de-asserted by the end of the packet condition on the media. It is also deasserted if loss of SYNC condition occurs during the reception of the packets. Receives clock output connecting to the network controller. RXC is derived from the Manchester data on the received data. In NS/AMD mode, it is active only during packet reception. In Intel/AT&T mode, it is continuous following the TXC clocks during idle period and switched to the received clocks as the packet arrives.
MTD214 Revision 1.4 12/05/1997 2/11
RXD CRS
O O
4 5
RXC
O
6
MYSON TECHNOLOGY
LTE/LS I/O 7
MTD214
CIS NIS
I I
8 9
X1/X2
I
10,11
TXD TXC T XE F DX
I O l I
12 13 14 15
GNDO TPOP/TPON
P O
17 18,16
GNDD VDDD DOP/DON
P P O
19 20 22,21
CIP/CIN
I
23,24
Test enabler and status links. This is a dual-purpose pin. It is an input that occurs during the power-on reset period. If MTD214 senses it is high during reset, MTD214 enables the link test function of the on-chip UTP transceiver and outputs the link status through this pin. To disable the link test function, this pin should be forced below 1.5 V during reset. Note that MTD214 always outputs the link pulses independent of the link test. Controller interface selection. This pin selects the signal format of the ENDEC output. If it is high, the format conforms to the Intel/AT&T controller. If it is low, it conforms to NS/AMD format. Media interface selection. This pin selects the network media. If it is high, the on-chip UTP transceiver is selected. If it is low, AUI is selected. It is also combined with the FDX pin to define the loopback test mode. Please see the functional description for the mode table. Crystal oscillator. A 20MHz-30pF with 100ppm accuracy crystal should be mounted between these 2 pins as well as two 30pF +/- 5% capacitors connecting each pin to ground. If an external clock source is used, it should be applied through X1 and allow X2 to be grounded. Transmitted data input connected to the network controller. The data is in NRZ format and is gated by the TXE signal. Transmitted clock output connected to the network controller. This is a 10MHz clock used to synchronize TXE and TXD. Transmitted enabler input connected to the network controller. This signal is used by MTD214 to gate the TXD input for packet transmission. Full duplex mode selection input. When this pin is low, half duplex and normal Ethernet operation is selected. When this pin is high, full duplex mode operation is enabled. In this mode, the collision status reporting is disabled, but heartbeat and jabber conditions are still reported on the COL pin. Since full duplex mode can be implemented in UTP media only when MTD214 is in auto media selection mode, AUI selection precedes the priority of full duplex mode. This pin is also combined with the NIS pin to define various testing modes of MTD214. Ground for UTP output transmitter. UTP transmitted output connected to an output transformer that couples with the UTP cable. The transformer should have an inductance of 100 to 200 uH and 1:1 turn ratio. Two 50-Ohm load resistors should also connect each output to VDD as load resistors. It is also recommended that a 100pF capacitor be connected to this pin from ground to remove any spurious noise. Ground for UTP output transmitter and AUI buffer. +5 V supply for AUI buffer. Data output for AUI interface. This differential signal should drive an equivalent load of 39 Ohm. Typically an external 78 Ohm connected across these 2 pins and the equivalent remote AUI load together are used to ensure proper amplitude. The AUI interface should be transformer-coupled. Collision input for AUI interface. This differential signal is coupled through the transformer. An external bias of 2.5V should be applied to these 2 pins.
MTD214 Revision 1.4 12/05/1997 3/11
Others parts begin by mt
|
|
|
