Connect an Exar Quad/Octal Uart

Schematic

Typical connection of a Quad or Octal Exar Uart

Signals

Signal-Name SODIMM-Pin Remark
D00 149 Data 0
D01 151 Data 1
D02 153 Data 2
D03 155 Data 3
D04 157 Data 4
D05 159 Data 5
D06 161 Data 6
D07 163 Data 7
A01 113 Adr 1
A02 115 Adr 2
A03 117 Adr 3
A04 119 Adr 4
A05 121 Adr 5
A06 123 Adr 6
A07 125 Adr 7
A08 110 Adr 8
/WE 89 Write Enable
/OE 91 Output Enable
/IRQ_UART 57 recommended/IRQ, other GPIOS also possible
/CS4 106 recommended select, other /CS possible
/Reset_out 87 Processor Reset Out

Note: Do not leave the modem status inputs floating as it would generate endless interrupts ! Tie unused modem status inputs with resistors to GND !

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(C) 2009 Keith & Koep GmbH. All rights reserved. Terms of Use