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DP83266 Datasheet(PDF) 119 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83266
Description  MACSITM Device (FDDI Media Access Controller and System Interface)
PDF  152 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83266 Datasheet(HTML) 119 Page - National Semiconductor (TI)

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70 Control Information (Continued)
Input Data Unit Descriptor (IDUD)
Input Data Unit Descriptors (IDUDs) are generated on Indicate Channels to describe where the MACSI device wrote each frame
part and to report status for the frame
For multi-part IDUDs intermediate status is written in each IDUD and when a status event occurs definitive status is written in
the last IDUD
A detailed description of the encodings of the Indicate Status bits is given in
Figure 75
31
30
29
28
27
24
23
16
15
14
13
12
0
IS
FRA
FRS
VC
RES
CNT
Word 0
F-L
RES
LOC
Word 1
Bit
Symbol
Description
Word 0
D12 – D0
CNT
Byte Count
Number of bytes in the IDU to which this IDUD points This count includes the FDDI
Frame Check Sequence (4 byte FCS) but it does not include the three FC pad bytes which are
written
D14 – D13
RES
Reserved
D15
VC
VCOPY
Reflects the state of the internal VCOPY signal sent to the Ring Engine by the System
Interface for this frame
0
VCOPY was negated
1
VCOPY was asserted
D23 – D16
FRS
Frame Status
This C E and A fields are valid only if the frame ended with an ED
D17 – D16
C
C Indicator
00
none
01
R
10
S
11
T
D19 – D18
A
A Indicator
00
none
01
R
10
S
11
T
D21 – D20
E
E Indicator
00
none
01
R
10
S
11
T
D22
VFCS
Valid FCS
0
FCS field was invalid
1
FCS field was valid
D23
VDL
Valid Date Length
0
Data length was invalid
1
Data length was valid
119



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