DP83266VF National Semiconductor, DP83266VF Datasheet - Page 81

• 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

7 0 Control Information
7 6 2 Maximum Token Rotation Time (TMAX)
The Maximum Token Rotation Time (TMAX) denotes the maximum Target Token Rotation Time supported by this station
TMAX is stored as a 4-bit value that is expanded to a binary exponential value Bits 7 – 4 are ignored during write operations and
are always read as Zero
TMAX has a maximum value of 1 34 seconds with a threshold of 40 96
to One) TMAX is set to the value of Ch which corresponds to 167 772 ms the default specified by the FDDI MAC Standard
For immediate transmissions from the transmit data state (T2) TMAX is always used to enforce an upper bound on the amount
of time a station may transmit TRT is reset to TMAX on entry to state T2 on immediate requests
Access Rules
Register Bits
Address
TMAX
TMAX(3–0)
093h
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
Zero
D7
Always
Read
Zero
D6
Stop Mode
163 84
327 68
655 36
1 3107 ms
2 6214 ms
5 2429 ms
10 486 ms
20 972 ms
41 943 ms
83 886 ms
167 77 ms (default)
335 54 ms
671 09 ms
1 3422
40 96
81 92
Write
Time
s
s
s
s
s
s
Zero
(Continued)
D5
Zero
D4
TMAX(3)
81
D3
c
TMAX(2)
2
TMAX
D2
s On a Master Reset (Function MARST set
TMAX(1)
D1
TMAX(0)
D0