dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 63

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

6 0 Control Information
Error Isolated Counter (EICT)
The Error Isolated Counter (EICT) is specified in the FDDI MAC Standard It is the count of all error frames detected by this
station and no previous station
It is incremented when
Interrupts are available on increment (CILR FREI) and when the 20-bit counter overflows and wraps around (COLR FREI)
ACCESS RULES
1) an FCS error is detected and the received Error Indicator (Er) is not equal to S or
2) a frame of invalid length (i e off-boundary T) is received and Er is not equal to S or
3) Er is not R or S
EICT0
EICT1
EICT2
EICT3
Address
A4 – A7h
CT(15)
CT(7)
Zero
Zero
D7
Always
Read
CT(14)
CT(6)
Zero
Zero
D6
(Continued)
Stop Mode
Write
CT(13)
CT(5)
Zero
Zero
D5
CT(12)
CT(4)
Zero
Zero
D4
63
CT(19)
CT(11)
CT(3)
Zero
D3
CT(18)
CT(10)
CT(2)
Zero
D2
CT(17)
CT(9)
CT(1)
Zero
D1
CT(16)
CT(8)
CT(0)
Zero
D0