DM9102AT datasheet(28/77 Pages) ETC

28 / 77 page

DM9102A

Single Chip Fast Ethernet NIC controller

Final

Version: DM9102A-DS-F03

August 28, 2000

5. Transmit Descriptor Base Address (CR4)

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

Bit

Name

Default

Description

31:0

TDBA

00000000h,

Transmit Descriptor Base Address

This register defines base address of transmit descriptor-chain. The transmit

descriptor- polling command after

CR4 is set will make DM9102A to fetch the descriptor at the Base-Address.

6. Network Status Report Register (CR5)

987

Bit

Name

Default

Description

25:23

SBEB

000,RO

System Bus Error Bits

These bits are read only and used to indicate the type of system bus fetal error. Valid

only when System Bus Error is set. The mapping bits are shown below.

Bit25

Bit24

Bit23

Bus Error Type

Parity error

Master abort

Slave abort

Reserved

22:20

TXPS

000,RO

Transmit Process State

These bits are read only and used to indicate the state of transmit process.

The mapping table is shown below.

Bit22 Bit21 Bit20

Process State

Transmit process stopped

Fetch transmit descriptor

Move Setup Frame from the host memory

Move data from host memory to transmit FIFO

Close descriptor by clearing owner bit of descriptor

Waiting end of transmit

Transmit end and Close descriptor by writing status

Transmit process suspend

19:17

RXPS

000,RO

Receive Process State

These bits are read only and used to indicate the state of receive process. The

mapping table is shown below.

Bit19 Bit18 Bit17

Process State

Receive process stopped

Fetch receive descriptor

Waiting for receive packet under buffer available

Move data from receive FIFO to host memory

DM9102AT датащи(PDF) 28 Page - List of Unclassifed Manufacturers

DM9102AT датащи(HTML) 28 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77

датащи скачать

ссылки URL