DP83266VF National Semiconductor, DP83266VF Datasheet - Page 121

• Manufacturer Part Number: DP83266VF
• Description: IC MEDIA ACSS CTRL INTF 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83266VF

• Applications: *
• Voltage - Supply: 4.75 V ~ 5.25 V
• Package / Case: 160-BFQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -
• Other names: *DP83266VF

NON-END FRAME STATUS
NORMAL-END FRAME STATUS
NO SPACE COPY ABORT
ERROR
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
7 0 Control Information
Last IDUD of Queue with a Page Cross The last available location of the ICHN’s IDUD queue was written Since
there was a page cross there was more data to be written Since there was no more IDUD space the remaining data
was not written Note that this code will not be written in an IDUD Middle so that a Zero IS field with Zero F-L tags can
be used by software as a null descriptor
Page Cross Must be an IDUD First or IDUD Middle This is part of a frame that filled up the remainder of the current
page requiring a new page for remainder of the data
Header End This refers to the last IDU of the header portion of a frame
Page Cross and Header End The occurrence of a page cross and header end
Intermediate A frame ended normally and there was no breakpoint
Burst Boundary A frame ended normally and there was a breakpoint because a burst boundary was detected
Threshold The copied frame threshold counter was reached when this frame was copied and the frame ended
normally
Service Opportunity This (normal end) frame was preceeded by a token or MACRST a MAC frame was received or
there was a ring-op change Any of these events marks a burst boundary
Insufficient Data Space Not all the frame was copied because there was insufficient data space This code is only
written in non-Header Info Sort Mode
Insufficient Header Space The frame copy was aborted because there was insufficient header space (in Header Info
Sort Mode0
Successful Header Copy Frame Info Not Copied There was sufficient space to copy the header but insufficient
data space to copy info or insufficient IDU space (on ICHN2) or both No info was copied
No Info Space The frame’s header was copied When copying the data there was insufficient data and or IDU space
FIFO Overrun The Indicate FIFO had an overrun while copying this frame This exception is caused when the memory
interface does not allow the MACSI device to empty the data FIFO as quickly as it is being filled This frame should not
be processed because data has been lost
Bad Frame This exception is caused when the incoming frame contains an invalid data length (too short or an odd
number of symbols) or an invalid Frame Check Sequence (FCS) This implies that the frame was not a valid FDDI
frame Therefore this frame should not be processed
Parity Error This exception is caused when the MACSI device detects an internal parity error at the System Interface-
Ring Engine interface (the MR FLOW bit must be set to enable parity checking) This implies a data corruption error
within the frame Therefore this frame should not be processed
Internal Error This exception is caused when the MACSI device detects an internal hardware error (e g illegal state
machine state) in the receive logic while receiving a frame This implies that the frame data may have been corrupted
Therefore this frame should not be processed In addition the MACSI device should be reset and reinitialized
FIGURE 7-5 Indicate Status Field (IS) of IDU Descriptor
(Continued)
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