82596DX Datasheet, PDF (36/77 Pages) Intel Corporation – HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR

82596DX SX
where
LINK POINTER
EL
S
I
CMD (bits 16–18)
Bits 19–28
C
B
In the 82586 or 32-bit Segmented modes this is a 16-bit offset to the next Command
Block In the Linear mode this is the 32-bit address of the next Command Block
If set this bit indicates that this command block is the last on the CBL
If set to one suspend the CU upon completion of this CB
If set to one the 82596 will generate an interrupt after execution of the command is
complete If I is not set to one the CX bit will not be set
The NOP command Value 0h
Reserved (zero in the 32-bit Segmented and Linear modes)
This bit indicates the execution status of the command The CPU initially resets it to zero
when the Command Block is placed on the CBL Following a command Completion the
82596 will set it to one
This bit indicates that the 82596 is currently executing the NOP command It is initially
reset to zero by the CPU The 82596 sets it to one when execution begins and to zero
when execution is completed This bit is also set when the 82596 prefetches the com-
mand
NOTE
The C and B bits are modified in one operation
OK
Indicates that the command was executed without error If set to one no error occurred
(command executed OK) If zero an error occur
INDIVIDUAL ADDRESS SETUP
This command is used to load the 82596 with the Individual Address This address is used by the 82596 for
inserting the Source Address during transmission and recognizing the Destination Address during reception
After RESET and prior to Individual Address Setup Command execution the 82596 assumes the Broadcast
Address is the Individual Address in all aspects i e
 This will be the Individual Address Match reference
 This will be the Source Address of a transmitted frame (for AL-LOC^e0 mode only)
The format of the Individual Address Setup command is shown in Figure 22
IA Setup 82586 and 32-Bit Segmented Modes
31
ODD WORD
16 15
EVEN WORD
0
EL S I X X X X X X X X X X 0 0 1 C B OK A 0 0 0 0 0 0 0 0 0 0 0 0 0
INDIVIDUAL ADDRESS
1st byte A15
LINK OFFSET
A0 4
6th byte
5th byte
4th byte
3rd byte
8
31
EL S
A31
I 000
4th byte
ODD WORD
0000
IA Setup Linear Mode
16 15
EVEN WORD
0 0 0 0 0 1 C B OK A 0 0 0 0 0 0
LINK ADDRESS
3rd byte
INDIVIDUAL ADDRESS
6th byte
0000
1st byte
5th byte
0
0 00
A0 4
8
C
where
LINK ADDRESS
EL B C I S
A
36
Figure 22
As per standard Command Block (see the NOP command for details)
Indicates that the command was abnormally terminated due to CU Abort control
command If one then the command was aborted and if necessary it should be
repeated If this bit is zero the command was not aborted