LPC47M14X datasheet(163/205 Pages) SMSC

163 / 205 page

SMSC DS – LPC47M14X

Page 163

Rev. 03/19/2001

Table 67 – DMA Channel Select Configuration Register Description

NAME

REG INDEX

DEFINITION

STATE

DMA Channel

Select

Default=0x02 or

0x04 (Note 1)

on VCC POR,

VTR POR,

HARD RESET

and

SOFT RESET

0x74 (R/W)

Bits[2:0] select the DMA Channel.

0x00= Reserved

0x01= DMA1

0x02= DMA2

0x03= DMA3

0x04-0x07= No DMA active

Note:

A DMA channel is activated by setting the DMA Channel Select register to [0x01-0x03] AND :

For the FDC logical device by setting DMAEN, bit D3 of the Digital Output Register.

For the PP logical device in ECP mode by setting dmaEn, bit D3 of the ecr.

Note:

The DMA channel must be disabled if not used/selected by any Logical Device. Refer to Note A.

Note 1: The default value of the DMA Channel Select register for logical device 0 (FDD) is 0x02 and for logical

device 3 and 5 is 0x04.

Note A. Logical Device IRQ and DMA Operation

IRQ and DMA Enable and Disable: Any time the IRQ or DMA channel for a logical block is disabled by a

and DMA channel disabled by the Configuration Registers (active bit or address not valid).

FDC: For the following cases, the IRQ and DMA channel used by the FDC are disabled. Will not

respond to the DMA request.

Digital Output Register (Base+2) bit D3 (DMAEN) set to "0".

The FDC is in power down (disabled).

Serial Ports:

Modem Control Register (MCR) Bit D2 (OUT2) - When OUT2 is a logic "0", the serial port interrupt

is disabled.

Parallel Port:

SPP and EPP modes: Control Port (Base+2) bit D4 (IRQE) set to "0", IRQ is disabled.

ECP Mode:

(1)

(DMA) dmaEn from ecr register. See table.

(2)

IRQ - See table.

MODE

(FROM ECR REGISTER)

IRQ PIN

CONTROLLED BY

PDREQ PIN

CONTROLLED BY

000

PRINTER

IRQE

dmaEn

001

SPP

IRQE

dmaEn

010

FIFO

(on)

dmaEn

011

ECP

(on)

dmaEn

100

EPP

IRQE

dmaEn

101

RES

IRQE

dmaEn

110

TEST

(on)

dmaEn

111

CONFIG

IRQE

dmaEn

Keyboard Controller: Refer to the KBD section of this spec.

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