SC2200 datasheet(144/433 Pages) NSC

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Revision 3.0

SuperI/O Module (Continued)

4.8.3

IR 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

and Base Address Registers" on page 81).

4.8.3.1

IR/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 4-19.

4.8.3.2

IRCP/SP3 Register and Bit Maps

The tables in this subsection provide register and bit maps

for Banks 0 through 7.

Figure 4-19. IRCP/SP3 Register Bank

Architecture

Bank 0

Bank 1

Bank 2

Bank 3

Bank 4

Bank 5

Bank 6

Bank 7

Offset 07h

Offset 06h

Offset 05h

Offset 04h

LCR/BSR

Offset 02h

Offset 01h

Offset 00h

Common

Throughout

All Banks

Table 4-46. Bank 0 Register Map

Offset

Type

Name

00h

RXD. ReceiveDataPort

TXD. Transmit Data Port

01h

R/W

IER. Interrupt Enable

02h

EIR. Event Identification

R/W

FCR. FIFO Control

03h

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

When bit 7 of this register is set to 1, bits [6:0] of BSR select the bank, as shown in Table 4-47.

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