DM9008 datasheet(16/68 Pages) ETC

16 / 68 page

DM9008

ISA/Plug & Play Super Ethernet Contoller

Final

Version :DM9008-DS-F02

June 14, 2000

Data Configure Register (DCR)

This register is used to program the DM9008 for the 8 or 16-bit memory interface, select byte ordering in 16-bit applications, and

establish FIFO thresholds. The DCR must be initialized prior to loading the Remote Byte Count Registers. LAS is set on power up.

5432

FT1

FT0

ARM

LAS

BOS

WTS

Bit

Symbol

Description

WTS

Word Transfer Select

0: Selects 8-bit DMA transfers

1: Selects 16-bit DMA transfers

BOS

Byte Order Select

0: MS byte placed on SD15-SD8 and LS byte on SD7-SD0 (32000, 8086)

1: MS byte placed on SD7-SD0 and LS byte on SD15-SD8 (68000)

Ignored when byte-wide DMA operation is chosen

Note: Byte Order Select mode is not supported in the current version of the DM9008, so

this bit should be cleared in the application

LAS

Long Address Select

0: Dual 16-bit DMA mode

1: Single 32-bit DMA mode

Note: Single 32-bit DMA mode is not supported in the current version of the DM9008, so

this bit should be cleared in the application

Loopback Select

0: Loopback mode selected. Bits D1, D2 of the TCR must also be programmed for

Loopback mode selected

1: Normal Operation

ARM

Auto-initialize Remote

0: Send Command not executed, all packets removed from Buffer Ring under program

control

1: Send Command executed, Remote DMA auto-initialized to remove packets from Buffer

Ring

FT0

FT1

FIFO Threshold Select: Encoded FIFO threshold. During reception, the FIFO threshold

indicates the number of bytes (or words) filled into the FIFO serially from the network

before received data are written to the buffer RAM

Receive Thresholds

FT1

FT0

Word Wide

Byte Wide

1 Word

2 Bytes

2 Words

4 Bytes

4 Words

8 Bytes

6 Words

12 Bytes

During transmission, the FIFO threshold indicates the number of bytes (or words filled into

the FIFO from the Local DMA before transmitted data are read from the buffer RAM. Thus,

the transmission threshold is 16 bytes less than the receive threshold

Reserved

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