SC2200 datasheet(111/433 Pages) NSC

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SuperI/O Module (Continued)

4.4.2.4

LDN 03h and 08h - Serial Ports 1 and 2

Serial Ports 1 and 2 are identical, except for their reset val-

ues.

Serial Port 1 is designated as LDN 03h and Serial Port 2 as

LDN 08h. Table 4-11 lists the configuration registers which

affect Serial Ports 1 and 2. Only the last register (F0h) is

described here (Table 4-12). See Table 4-3 "Standard Con-

figuration Registers" on page 104 for descriptions of the

others.

Table 4-11. Relevant Serial Ports 1 and 2 Registers

Index

Type

Configuration Register or Action

Reset Value

Port 1

Port 2

30h

R/W

Activate. See also bit 0 of the SIOCF1 register.

00h

60h

R/W

Base Address MSB register. Bits [7:3] (for A[15:11]) are RO, 00000b.

03h

02h

61h

R/W

Base Address LSB register. Bit [2:0] (for A[2:0]) are RO, 000b.

F8h

70h

R/W

Interrupt Number.

04h

03h

71h

R/W

Interrupt Type. Bit 1 is R/W; other bits are RO.

03h

74h

Report no DMA assignment.

04h

75h

Report no DMA assignment.

04h

F0h

R/W

Serial Ports 1 and 2 Configuration register.

02h

Table 4-12. Serial Ports 1 and 2 Configuration Register

Bit

Description

Index F0h

Serial Ports 1 and 2 Configuration Register (R/W)

Reset Value: 02h

Bank Select Enable. Enables bank switching for Serial Ports 1 and 2.

0: Disabled. (Default)

1: Enabled.

6:3

Reserved.

Busy Indicator. (RO) This bit can be used by power management software to decide when to power-down Serial Ports 1

and 2 logical devices.

0: No transfer in progress. (Default)

1: Transfer in progress.

Power Mode Control. When the logical device is active in:

0: Low power mode - Serial Ports 1 and 2 Clock disabled. The output signals are set to their default states. Registers are

maintained. (Unlike Active bit in Index 30h that also prevents access to Serial Ports 1 or 2 registers.)

1: Normal power mode - Serial Ports 1 and 2 clock enabled. Serial Ports 1 and 2 are functional when the respective logical

devices are active. (Default)

TRI-STATE Control. This bit controls the TRI-STATE status of the device output pins when it is inactive (disabled).

0: Disabled. (Default)

1: Enabled when device inactive.

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