82596DX Datasheet, PDF (37/77 Pages) Intel Corporation – HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR

82596DX SX
Bits 19–28
CMD (bits 16–18)
INDIVIDUAL ADDRESS
Reserved (zero in the 32-bit Segmented and Linear modes)
The Address Setup command Value 1h
The individual address of the node 0 to 6 bytes long
The least significant bit of the Individual Address must be zero for Ethernet (see the Command Structure)
However no enforcement of 0 is provided by the 82596 Thus an Individual Address with 1 as its least
significant bit is a valid Individual Address in all aspects
The default address length is 6 bytes long as in 802 3 If a different length is used the IA Setup command
should be executed after the Configure command
CONFIGURE
The Configure command loads the 82596 with its operating parameters It allows changing some of the
parameters by specifying a byte count less than the maximum number of configuration bytes (11 in the 82586
mode 14 in the 32-Bit Segmented and Linear modes) The 82596 configuration depends on its mode of
operation
 In the 82586 mode the maximum number of configuration bytes is 12 Any number larger than 12 will be
reduced to 12 and any number less than 4 will be increased to 4 When configuring the 12^th byte (Byte 11
undefined) in 82586 mode this byte should be all ones
 The additional features of the serial side are disabled in the 82586 mode
 In both the 32-Bit Segmented and Linear modes there are four additional configuration bytes which hold
parameters for additional 82596 features If these parameters are not accessed the 82596 will follow their
default values
 For more detailed information refer to the 32-Bit LAN Components User’s Manual
The format of the Configure command is shown in Figures 23 24 and 25
31
ODD WORD
16 15
EVEN WORD
0
EL S I X X X X X X X X X X 0 1 0 C B OK A 0 0 0 0 0 0 0 0 0 0 0 0 0
Byte 1
Byte 0
A15
LINK OFFSET
A0 4
Byte 5
Byte 4
Byte 3
Byte 2
8
Byte 9
Byte 8
Byte 7
Byte 6
12
XXXXXXXXXXXXXXXXXX X XXXXX
Byte 10
16
Figure 23 CONFIGURE 82586 Mode
31
EL S
I 000
Byte 1
Byte 5
Byte 9
Byte 13
ODD WORD
0000
0000
Byte 0
Byte 4
Byte 8
Byte 12
16 15
EVEN WORD
1 0 C B OK A 0 0 0 0 0 0 0 0 0 0
A15
LINK OFFSET
Byte 3
Byte 2
Byte 7
Byte 6
Byte 11
Byte10
0
0 00
A0 4
8
12
16
Figure 24 CONFIGURE 32-Bit Segmented Mode
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