WD2123 Datasheet | Western Digital

WESTERN DIGITAL c o R p o R A T / o N we 2123 DEUCE DUAL ENHANCED UNIVERSAL MUNICATIONS ELEMENT '- i Features .. TWO INDEPENDENT ASYNCHRONOUS FULL DUPLEX DATA MUNICATION CHANNELS (2 BOARTS) .. TWO INDEPENDENT BAUD RATE GENERATORS (ONE PER CHANNEL) o EACH CHANNEL WITH FOLLOWING Features : .. SELECTABLE 5 TO 8 BIT CHARACTERS .. l X, 16X, 64X CLOCK RATES o 16 SELECTABLE BAUD RATE CLOCK FREQUENCIES (INTERNAL) .. LINE BREAK DETECTION AND GENERATION o 1,1'12, OR 2 STOP BIT SELECTION .. FALSE START BIT DETECTION .. ODD OR EVEN PARITY GENERATE AND DETECTION .. OVERRUN AND FRAMING DETECTION o DOUBLE BUFFERING OF DATA .. TTL PATIBLE INPUTS AND OUTPUTS .. PATIBLE WITH 8251 A (ASYNC ONLy) AND WDl 9S3 DEVICES III DIAGNOSTIC LOCAL LOOP-BACK MODE ;,: ~ e RXD INITIALIZATION UPON MASTER RESET <t o ON-BOARD OSCILLATOR FOR EASE OF USE WITH A :E CRYSTAL o VERSATILE CLOCK SELECT OPTIONS FOR INDEPEN- DENT TRANSMIT AND RECEIVE RATES INTRODUCTION The Western Digital WD2123 Dual Enhanced Universal munications Element (DEUCE) is a single chip MOS/LSI Data munications Controller Circuit that contains two independent full-duplex asynchronous RECEIVER/TRANSMITTER CHANNELS and two independent BAUD RATE GENERATORS. The WD2123 is fabricated in N-Channel silicon gate technology and is packaged in a 40 pin plastic or ceramic package. All inputs and outputs are TTL patible. TXD- B RXO-B fi E Cs1 c/O' DO D' D2 VSS D3 D4 D5 D6 D7 CS2 WE Cs3 RXO-A TXO- A TXRDY- B RXRDY- B TXE-B BRKDET-B Ri-S-8...