Adapter Internal Registers

A.3.13 Burst Size Register±BSIZEreg @ 0x44 (DIO) (Byte 1)

This register is used to set the receive and transmit burst sizes to be used by the adapter. This register is only writable while the ThunderLAN controller is in reset. (NRESET = 0). This register is set to 0x22 on an Ad_Rst or when PRST# is asserted.

 

 

 

 

Byte 1

 

 

 

15

14

13

12

11

10

9

8

Tx Burst Size

 

 

 

Rx Burst Size

 

 

 

 

 

 

 

 

 

 

Table A±17. Burst Size Register Bits

Bit

Name

Function

 

15±12

Tx burst size

Transmit burst size: This nibble code indicates the burst size to be used in data transfers

 

 

for transmit operations (Tx list or data transfers). The code indicates the maximum num-

 

 

ber of bytes to be transferred in any one transmit DMA data burst. At reset, the burst

 

 

size is set to a default level of 64 bytes (code = 2).

 

 

The burst size codes are:

 

 

-

0:

16 bytes

 

 

-

1:

32 bytes

 

 

-

2:

64 bytes (default)

 

 

-

3:

128 bytes

 

 

-

4:

256 bytes

 

 

-

5±7:

512 bytes

 

 

-

8±F: reserved

11±8

Rx burst size

Receive burst size: This nibble code indicates the burst size to be used in data transfers

 

 

for receive operations (Rx list or data transfers). The code indicates the maximum num-

 

 

ber of bytes to be transferred in any one receive DMA data burst. At reset, the burst size

 

 

is set to a default level of 64 bytes (code = 2).

 

 

The burst size codes are:

 

 

-

0:

16 bytes

 

 

-

1:

32 bytes

 

 

-

2:

64 bytes (default)

 

 

-

3:

128 bytes

 

 

-

4:

256 bytes

 

 

-

5±7:

512 bytes

 

 

-

8±F:

reserved

 

 

 

 

 

A-36

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Texas Instruments TNETE100A, TNETE211 Burst Size Register±BSIZEreg @ 0x44 DIO Byte, Table A±17. Burst Size Register Bits
Page 148 Page 150

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