AMD SC3200 manual Bank 0 Register Map, 3.1 IR/SP3 Mode Register Bank Overview

SuperI/O Module 32581C

5.8.3IR Communications Port (IRCP) / Serial Port 3 (SP3) Functionality

This section describes the IRCP/SP3 support registers. The IRCP/SP3 functional block provides advanced, versa- tile serial communications features with IR capabilities.

The IRCP/SP3 also supports two DMA channels; the func- tional block can use either one or both of them. One chan- nel is required for IR-based applications, since IR communication works in half duplex fashion. Two channels would normally be needed to handle high-speed full duplex IR based applications.

The IRCP or Serial Port 3 is chosen via bit 6 of the PMR Register (see Section 4.2 "Multiplexing, Interrupt Selection, and Base Address Registers" on page 70).

5.8.3.1IR/SP3 Mode Register Bank Overview

Eight register banks, each containing eight registers, con- trol IR/SP3 operation. All registers use the same 8-byte address space to indicate offsets 00h through 07h. The BSR register selects the active bank and is common to all banks. See Figure 5-19.

5.8.3.2IRCP/SP3 Register and Bit Maps

The tables in this subsection provide register and bit maps for Banks 0 through 7.

Bank 7

Bank 6

Bank 5

Bank 4

Bank 3

Bank 2

Bank 1

Bank 0

Offset 07h

Offset 06h

Offset 05h

Offset 04h

LCR/BSR

Offset 02h

		Common
Offset	01h	Register
		Throughout
Offset 00h
		All Banks

		Figure 5-19. IRCP/SP3 Register Bank
		Architecture
		Table 5-46. Bank 0 Register Map
Offset	Type	Name
00h	RO	RXD. Receive Data Port
	W	TXD. Transmit Data Port
01h	R/W	IER. Interrupt Enable
02h	RO	EIR. Event Identification
	R/W	FCR. FIFO Control
03h	W	LCR1. Link Control
	R/W	BSR1. Bank Select
04h	R/W	MCR. Modem/Mode Control
05h	R/W	LSR. Link Status
06h	R/W	MSR. Modem Status
07h	R/W	SPR. Scratchpad
	R/W	ASCR. Auxiliary Status and Control

1.When bit 7 of this register is set to 1, bits [6:0] of BSR select the bank, as shown in Table 5-47.

AMD Geode™ SC3200 Processor Data Book 133