dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 77

• Manufacturer Part Number: dp83261
• Description: Bmac Device Fddi Media Access Controller
• Manufacturer: National Semiconductor Corporation

Symbol
MIP
MID7 – 0
7 0 Signal Descriptions
7 3 2 Signals
All output signals change relative to the rising edge of the Local Byte Clock signal (provided by the Clock Distribution Device)
and are active high
7 3 2 1 Indication Data
The Contents and interpretation of MID7 – 0 are given in Table 7-3
74 – 76
79 – 83
Pin
73
Contents
Data
Status
undefined
I O
O
O
MAC Indicate Parity Odd parity on MID7 – 0 Only valid with Data and Status Indicators
MAC Indicate Data
Data Indicates data is being presented on MID7 – 0 between the rising edge of Frame Control Receive
FCRCVD and the rising edge of one of the following signals
Status Indicates Status Indicators are being presented on MID7 – 0 while Ending Delimiter Received
(EDRCVD) or Token Received (TKRCVD) is asserted
Ending Delimiter Received (EDRCVD)
Token Received (TKRCVD)
Format Error (FOERROR)
Frame Strip (FRSTRP)
or MAC Reset (MACRST)
otherwise
Value
254
255
TR
RT
RR
RS
SR
TT
TS
TX
nT
ST
SS
0
1
2
(Continued)
TABLE 7-3 MAC Indication Coding
MID(7 – 4)
F
F
0
0
0
5
5
5
5
0
6
6
6
7
7
7
x
77
MID(3 – 0)
i
5 6 or 7
Description
E
F
0
1
2
5
6
7
5
5
6
7
5
6
7
x
Between RCSTART and
EDRCVD or
TKRCVD or
FRSTRP or
FOERROR or
MACRST
with EDRCVD or TKRCVD
with EDRCVD
with EDRCVD
with EDRCVD
with EDRCVD
with EDRCVD
with EDRCVD
with EDRCVD
with EDRCVD
with EDRCVD
with EDRCVD
otherwise
Condition