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XR16M2751 Datasheet(PDF) 8 Page - Exar Corporation |
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XR16M2751 Datasheet(HTML) 8 Page - Exar Corporation |
8 / 52 page XR16M2751 PRELIMINARY 8 HIGH PERFORMANCE DUART WITH 64-BYTE FIFO AND POWERSAVE FEATURE P1.0.0 2.0 FUNCTIONAL DESCRIPTIONS 2.1 CPU Interface The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and write transactions. The M2751 data interface supports the Intel compatible types of CPUs and it is compatible to the industry standard 16C550 UART. No clock (oscillator nor external clock) is required to operate a data bus transaction. Each bus cycle is asynchronous using CSA/B#, IOR# and IOW# or CS#, R/W# and A3 inputs. Both UART channels share the same data bus for host operations. A typical data bus interconnection for Intel and Motorola mode is shown in Figure 3. 2.2 Device Reset The RESET input resets the internal registers and the serial interface outputs in both channels to their default state (see Table 17). An active high pulse of longer than 40 ns duration will be required to activate the reset function in the device. FIGURE 3. XR16M2751 TYPICAL INTEL/MOTOROLA DATA BUS INTERCONNECTIONS VCC VCC OP2A# DSRA# CTSA# RTSA# DTRA# RXA TXA RIA# CDA# OP2B# DSRB# CTSB# RTSB# DTRB# RXB TXB RIB# CDB# GND A0 A1 A2 UART_CSA# UART_CSB# IOR# IOW # D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 A2 CSA# CSB# D0 D1 D2 D3 D4 D5 D6 D7 IOR# IOW # UART Channel A UART Channel B UART_INTB UART_INTA INTB INTA RXRDYA# TXRDYA# RXRDYA# TXRDYA# RXRDYB# TXRDYB# RXRDYB# TXRDYB# UART_RESET RESET Serial Interface of RS-232, RS-485 Serial Interface of RS-232, RS-485 2750_int Intel Data Bus Interconnections (no connect) (no connect) 2.25 to 5.5 Volt VCC VCC OP2A# DSRA# CTSA# RTSA# DTRA# RXA TXA RIA# CDA# OP2B# DSRB# CTSB# RTSB# DTRB# RXB TXB RIB# CDB# GND A0 A1 A2 UART_CS# A3 R/W# D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 A2 CSA# CSB# D0 D1 D2 D3 D4 D5 D6 D7 IOR# IOW# UART Channel A UART Channel B UART_IRQ# INTB INTA RXRDYA# TXRDYA# RXRDYA# TXRDYA# RXRDYB# TXRDYB# RXRDYB# TXRDYB# RESET# RS-232 Serial Interface RS-232 Serial Interface Motorola Data Bus Interconnections VCC UART_RESET# (no connect) (no connect) (no connect) VCC |
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