DM9008 Ver la hoja de datos (PDF) - Davicom Semiconductor, Inc.

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DM9008

ISA/Plug & Play Super Ethernet Contoller

Davicom Semiconductor, Inc. 

Current Page Register (CURR)

This register is used internally by the Buffer Management

Logic as a backup register for reception. CURR contains the

address of the first buffer to be used for a packet reception,

and is used to restore DMA pointers in the event of receive

errors. This register is initialized to the same value as

PSTART, and should not be written to again unless the

controller is reset.

76

5

4

3

210

CURR A15 A14 A13 A12 A11 A10 A9 A8

Current Local DMA Register 0, 1 (CLDA0, 1)

These two registers can be accessed to determine the current

Local DMA Address.

7

65

4

3

210

CLDA A15 A14 A13 A12 A11 A10 A9 A8

1

76

5

4

3

210

CLDA A7 A6 A5 A4 A3 A2 A1 A0

0

(iii) Remote DMA Registers

Remote Start Address Registers (RSAR0, 1)

Remote Byte Count Registers (RBCR0, 1)

Remote DMA operations are programmed via the Remote

Start Address (RSAR0, 1) and Remote Byte Count registers

(RBCR0, 1). The Remote Start Address is used to point to the

start of the block of data to be transferred. The Remote Byte

Count is used to indicate the length of the block (in bytes).

DM9008

ISA/Plug & Play Super Ethernet Contoller

7

6

5

43

210

RSAR1 A15 A14 A13 A12 A11 A10 A9 A8

7

65

4

3

210

RSAR0 A7 A6 A5 A4 A3 A2 A1 A0

7

6

5

4

3

2

10

RBCR1 BC15 BC14 BC13 BC12 BC11 BC10 BC9 BC8

³

7

6

5

4

3

21

0

RBCR0 BC7 BC6 BC5 BC4 BC3 BC2 BC1 BC0

Current Remote DMA Address Registers (CRDA0, 1)

The Current Remote DMA Registers contain the current

address of the Remote DMA. The bit assignments are

shown below:

7

6

54

3

210

CRDA1 A15 A14 A13 A12 A11 A10 A9 A8

7

6

54

3

2

10

CRDA0 A7 A6 A5 A4 A3 A2 A1 A0

Final

25

Version: DM9008-DS-F02

November 30, 2000

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