Table 5-11. Relevant Serial Ports 1 And 2 Registers; Table 5-12. Serial Ports 1 And 2 Configuration Register - AMD Geode SC2200 Data Book

32580B
5.4.2.4 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 5-11 lists the configuration registers which
Index Type Configuration Register or Action
30h R/W Activate. See also bit 0 of the SIOCF1 register.
60h R/W Base Address MSB register. Bits [7:3] (for A[15:11]) are RO, 00000b.
61h R/W Base Address LSB register. Bit [2:0] (for A[2:0]) are RO, 000b.
70h R/W Interrupt Number.
71h R/W Interrupt Type. Bit 1 is R/W; other bits are RO.
74h RO Report no DMA assignment.
75h RO Report no DMA assignment.
F0h R/W Serial Ports 1 and 2 Configuration register.
Bit Description
Index F0h
7 Bank Select Enable. Enables bank switching for Serial Ports 1 and 2.
0: Disabled. (Default)
1: Enabled.
6:3 Reserved.
2 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.
1 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)
0 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.
108

Table 5-11. Relevant Serial Ports 1 and 2 Registers

Table 5-12. Serial Ports 1 and 2 Configuration Register

Serial Ports 1 and 2 Configuration Register (R/W)
affect Serial Ports 1 and 2. Only the last register (F0h) is
described here (Table 5-12). See Table 5-3 "Standard Con-
figuration Registers" on page 101 for descriptions of the
others.
AMD Geode™ SC2200 Processor Data Book
SuperI/O Module
Reset Value
Port 1 Port 2
00h 00h
03h 02h
F8h F8h
04h 03h
03h 03h
04h 04h
04h 04h
02h 02h
Reset Value: 02h