CL-PD6833 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CL-PD6833

PCI-to-CardBus Host Adapter

Cirrus Logic 

CL-PD6833

PCI-to-CardBus Host Adapter

13.11 Master Clear

Register Name: Master Clear

I/O Index: Dh

Register Per: socket

Register Compatibility Type: DMA

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Master Clear

R/W:0

Bits 7:0 — Master Clear

This register emulates the Master Clear register of the Intel 8237. Unlike the Intel 8237, there is

no temporary register to read back, so read back is not supported. When this register is written,

the DMA section of the CL-PD6833 assumes the same state as caused by PCI_RST. The DMA

Slave Configuration register is unaffected by writes to this register.

13.12 Mask Register

Register Name: Mask Register

I/O Index: Fh

Register Per: socket

Register Compatibility Type: DMA

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Reserved

Mask

R/W:0

R/W:0

This register emulates the Mask registers of the Intel 8237. Unlike the Intel 8237, there is only one channel

represented here. Read back is supported.

Bit 0 — Mask

When this bit is ‘1’, the DREQ from the PC Card is ignored. When this bit is ‘0’, DMA requests are

enabled. This bit is automatically set if the Autoinitialize bit is not set when a transfer completes.

Bits 7:1 — Reserved

178

DMA OPERATION REGISTERS

ADVANCE DATA BOOK v0.3

June 1998

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