User guide

Table 9–10 (Cont.) Super I/O Register Address Space Map

Address Offset

Read/Write

Physical

Address Register

COM2 Serial Port Registers

2F8-R 0DLAB=0 1 C000 5F00 COM2 receiver buffer register

2F8-W 0DLAB=0 1 C000 5F00 COM2 transmitter holding register

2F8 0DLAB=1 1 C000 5F00 COM2 divisor latch register (LSB)

2F9 1DLAB=0 1 C000 5F20 COM2 interrupt enable register

2F9 1DLAB=1 1 C000 5F20 COM2 divisor latch register (MSB)

2FA-R 1 C000 5F40 COM2 interrupt identiﬁcation register

2FA-W 1 C000 5F40 COM2 FIFO control register

2FB 1 C000 5F60 COM2 line control register

2FC 1 C000 5F80 COM2 modem control register

2FD 1 C000 5FA0 COM2 line status register

2FE 1 C000 5FC0 COM2 modem status register

2FF 1 C000 5FE0 COM2 scratch pad register

COM1 Serial Port Registers

3F8-R 0DLAB=0 1 C000 7F00 COM1 receiver buffer register

3F8-W 0DLAB=0 1 C000 7F00 COM1 transmitter holding register

3F8 0DLAB=1 1 C000 7F00 COM1 divisor latch register (LSB)

3F9 1DLAB=0 1 C000 7F20 COM1 interrupt enable register

3F9 1DLAB=1 1 C000 7F20 COM1 divisor latch register (MSB)

3FA-R 1 C000 7F40 COM1 interrupt identiﬁcation register

3FA-W 1 C000 7F40 COM1 FIFO control register

3FB 1 C000 7F60 COM1 line control register

3FC 1 C000 7F80 COM1 modem control register

3FD 1 C000 7FA0 COM1 line status register

3FE 1 C000 7FC0 COM1 modem status register

3FF 1 C000 7FE0 COM1 scratch pad register

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9–20 Nbus