Chapter 3 - MACSI Host Interface

Table 3-25. Intel 82596 Transmit Status / Control

Intel 82596 Transmit Status/Control

Offst

15

14

 

13

12

11

10

9

8

7

 

6

 

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0x0C

 

 

Interframe Spacing

 

 

 

 

EXP PRI

 

LIN PRI

 

DB

BM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0x0D

 

Max Entry

 

AR

 

 

 

 

 

Slot Time

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Backoff method (BM) (p. 4-131)

This parameter determines when to start the back-off timeout.

Disable backoff (DB) (p. 4-141)

Disables the backoff algorithm implemented in the 82596.

Linear priority (LIN PRI) (p. 4-130,131)

Specifies the number of slot times that the 82596 waits after Interframe Spacing or after Backoff before enabling transmission.

Exponential priority (EXP PRI) (p 4-131)

Extends the range from which the random number for backoff is selected.

Interframe spacing (p 4-133)

Specifies the time period, in transmit unit clocks, that the 82596 must wait after detecting the later of the two events; the last bit has been transmitted, or Carrier Sense becomes inactive.

Slot time (p. 4-133,134)

Specifies Slot Time, in transmit unit clocks, for the network. This can be changed to optimize the network to specific application environments.

Automatic retry (AR) (p. 4-139)

Causes the 82596 to automatically retry transmission if a collision is detected before the last 30 bits of the Preamble sequence.

Max retry (p. 4-134)

Specifies the maximum number of transmission retries (after a collision) that the 82596 performs before transmission is aborted.

Intel 82596 Status/Control – Receive Functions

This field provides equivalent direct access to 82596 receive-related functions.

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