Features: `Control
-CController and integrated bus interface total sol tion for IEEE 802.3, 10BASE5, 10BASE2 and 10BASE-T
-CSoftware-compatible with industry standar Ethernet adapters:
*Novell®'s NE 2000
*Western Digital/SMC's (8003E, 8003EBT 8013EBT)
-CSelectable buffer memory siz
-CNo external bus logic or driver
-CIntegrated controller, MCC and transceive
-CFull IEEE 802.3 AUI interfac
-CSingle 5V suppl
-CSoftware-compatible with DP8390, DP8390 and DP83902
-CEfficient buffer management implementatio
`MCC module (Manchester Code Converter, also called ENDEC)
-C10 Mbit/s Manchester encoding/decodin
-CSquelch on receive and collision pair
`TPI module (10BASE-T) transceiver
-CTransmitter and receiver function
-CCollision detect, heartbeat and jabbe
-CSelectable link integrity test or link disable
-CPolarity detection/correctio
`Provides more powerful functions than NS DP83905
-CSupports 15 I/O bases instead of
-CDirect ID PROM access through I/O port instea of through remote DMA
-CAuto configuration function-supported make jumperless more powerful
-CSolution for multiple LAN cards I/O bases conflic problem to make manufacture more efficient.
-CSupports "write ID back to EEPROM" functio instead of just writing configuration back to EEPROM to make manufacture more efficient.
-CModify current configurations without turning of power
-CVariety of EEPROM supportePinout
Specifications
NOTICE:
|
VALUE |
| Supply Voltage (VCC) |
4.75V to +5.5V |
| DC Input Voltage (VIN) |
-0.5V to VCC +0.5V |
| DC Output Voltage (VOUT) |
-0.5V to VCC +0.5V |
Storage Temperature Range
(TSTG) |
-65 to +150 |
| Power Dissipation (PD) |
500 mW |
Lead Temp. (TL)
(Soldering, 10 sec.) |
260 |
ESD rating (RZAP=1.5K,
CZAP=120pF) |
1600V |
NOTICE:
Stresses greater than those listed under ABSOLUTE MAXI- MUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Expo- sure to absolute maximum rating conditions for extended period may affect reliability.
DescriptionThe MX98905B is designed for easy implementation of CSMA/CD local area networks, which include Ethernet® (10BASE5), Thin Ethernet (10BASE2), and Twisted-pair Ethernet (10BASE-T). The Media Ac- cess Control (MAC) and Encode-Decode (ENDEC) are provided with an AUI interface. The 10BASE-T transceiver functions according to the IEEE 802.3 standards, and the MX98905 10BASE-T transceiver operations in compliance with the IEEE standard.
The functional block of the MX98905B consists of the integration of the entire bus interface for PC-AT® (Industry Standard Architecture, ISA) bus-based sys- tems, receiver, transmitter, collision, heartbeat, loopback, jabber, and link integrity blocks. When combined with equalization resistors, the transceiver transmits or receives filters, and pulse transformers provide physical interface from the ENDEC module of the MX98905 and the twisted-pair medium.
When software and hardware are properly configured, the MX98905 can be set to be compatible with either the NE2000 or EtherCard PLUS16TM. All bus drivers and control logic are integrated inside the chip to reduce LAN card cost and area.
Manchester encoding and decoding is made possible through the integrated ENDEC by means of a differ- ential transceiver and phase lock loop decoder at 10 Mbit/sec. Collision detect translator and diagnostic loopback capability are included in this process. Interfacing directly with the transceiver module, the ENDEC module also provides a fully IEEE-compliant AUI (Attachment Unit Interface) to connect with other media transceivers.
The Media Access Control function, provided by the Ethernet Network Control (ENC) module, effects an efficient packet transmission and reception control through unique dual DMA channels and an internal FIFO. To lessen board cost and area overheads, bus arbitration and memory control logic are integrated.
Designed for easy interface with other transceivers by means of the AUI interface, the MX98905B provides a thorough single chip solution for 10BASE-T IEEE 802.3 network.
Constraints of CMOS processing require that isolation, whether capacitive or inductive, be used at the AUI differential signal interface for 10BASE5 and 10BASE2 applications.
MX98905B Data Sheet
