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DP83261 Datasheet(PDF) 108 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83261
Description  BMAC Device (FDDI Media Access Controller)
PDF  132 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83261 Datasheet(HTML) 108 Page - National Semiconductor (TI)

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70 Signal Descriptions (Continued)
75 ELECTRICAL INTERFACE
The Electrical Interface signals comprise all of the clocking power supply and ground pins
Symbol
Pin
IO
Description
LSC
87
I
Local Symbol Clock
25 MHz clock with a 4060 duty-cycle Typically generated by the CDD
LBC
86
I
Local Byte Clock
125 MHz clock 5050 duty-cycle in phase with LSC Typically generated by the
CDD
RST
118
I
Master Reset
Equivalent to setting the Master Reset bit in the Function Register An asynchronous
input that must be asserted for at least 5 LSC clock cycles When asserted all bi-directional signals
are tri-stated Active low signal
VCC 11
4 17 34
I
Positive Power Supply
5V g5% relative to GND
58 78
94 100
106 117
GND 11
5 18 33
I
Power Supply Return
57 77
88 – 91
101
116 128
76 PINOUT SUMMARY
TABLE 7-6 Pinout Summary
Pin
Signal Name
Symbol
IO
1
Control Bus Data 1
CBD1
IO
2
Control Bus Data 2
CBD2
IO
3
Control Bus Data 3
CBD3
IO
4
Positive Power Supply
VCC
I
5
Ground
GND
I
6
Control Bus Data 4
CBD4
IO
7
Control Bus Data 5
CBD5
IO
8
Control Bus Data 6
CBD6
IO
9
Control Bus Data 7
CBD7
IO
10
Control Bus Parity
CBP
IO
11
Source Address IG Transparency
SAIGT
I
12
Source Address Transparency
SAT
I
13
Void Strip
STRIP
I
14
Frame Check Sequence Transparency
FCST
I
15
Request Claim
RQCLM
I
16
Request Beacon
RQBCN
I
17
Positive Power Supply
VCC
I
18
Ground
GND
I
19
Request Class 3
RQRCLS3
I
108



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