dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 72

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

PRP
PRC
PRD7 – 0
PIP
PIC
PID7 – 0
Symbol
7 0 Signal Descriptions
7 2 PHY INTERFACE
The PHY Interface signals transfer symbol pairs between the BMAC and PLAYER devices Transfers are synchronous using the
12 5 MHz Local Byte Clock signal (signal provided by the Clock Distribution Device)
A control bit is used to indicate if a Data symbol pair or Control symbol pair or a mixed Control Data symbol pair are being
transferred
Parity is generated on the PHY Indicate and MA Indicate data Parity is checked on the PHY Request and MA Request
data
110 108
105 103
111 109
107 104
102 98
99 97
Pin
95 92
96 93
114
112
115
113
I O
O
O
O
I
I
I
PHY Request Parity Odd parity for PRC and PRD7 – 0
PHY Request Control
0 Indicates PRD7 – 0 contains a Data symbol pair
1 Indicates PRD7 – 0 contains a Control or mixed Control Data symbol pair
PHY Request Data Contains a Data or Control symbol pair
PHY Indicate Parity Odd parity for PIC and PID7 – 0
PHY Indicate Control
0 Indicates PID7 – 0 contains a Data symbol pair
1 Indicates PID7 – 0 contains a Control or mixed Control Data symbol pair
PHY Indicate Data Contains a Data or a mixed Control Data symbol pair
(Continued)
72
Description