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CX20437VC

SmartSCM Modem

Conexant Systems 

SmartSCM Modem Data Sheet

5 PARALLEL HOST INTERFACE......................................................................................................................... 5-1

5.1 Overview................................................................................................................................................... 5-1

5.2 Register Signal Definitions ....................................................................................................................... 5-3

5.2.1 IER - Interrupt Enable Register (Addr = 1, DLAB = 0) ............................................................... 5-3

5.2.2 FCR - FIFO Control Register (Addr = 2, Write Only) ................................................................. 5-4

5.2.3 IIR - Interrupt Identifier Register (Addr = 2)................................................................................ 5-5

5.2.4 LCR - Line Control Register (Addr = 3) ...................................................................................... 5-6

5.2.5 MCR - Modem Control Register (Addr = 4) ................................................................................ 5-7

5.2.6 LSR - Line Status Register (Addr = 5) ....................................................................................... 5-8

5.2.7 MSR - Modem Status Register (Addr = 6) ................................................................................. 5-9

5.2.8 RBR - RX Buffer (Receiver Buffer Register) (Addr = 0, DLAB = 0) ............................................ 5-9

5.2.9 THR - TX Buffer (Transmitter Holding Register) (Addr = 0, DLAB = 0) ...................................... 5-9

5.2.10 Divisor Registers (Addr = 0 and 1, DLAB = 1) ........................................................................... 5-9

5.2.11 SCR - Scratch Register (Addr = 7)............................................................................................. 5-9

5.3 Receiver FIFO Interrupt Operation ......................................................................................................... 5-10

5.3.1 Receiver Data Available Interrupt ............................................................................................ 5-10

5.3.2 Receiver Character Timeout Interrupts .................................................................................... 5-10

5.4 Transmitter FIFO Interrupt Operation ..................................................................................................... 5-10

5.4.1 Transmitter Empty Interrupt ..................................................................................................... 5-10

100490C

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