User`s guide

Table C–4 PC87312 Combination Controller Register Address Space Map

Address Offset

Read/Write

Physical

Address Register

General Registers

398 1 C000 7300 Index address register

399 1 C000 7320 Data address register

Index Register

0 Function enable register

1 Function address register

2 Power and test 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

(continued on next page)

C–8 PCI Address Maps