DP83953 datasheet(31/90 Pages) NSC

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4.0 Functional Description (Continued)

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Note: ACOL= Any Port Collision, AREC= Any Port Reception, JAB= Any Port Jabbering, LINK=Port Link, COL= Port Collision, REC=Port Reception,

PART=Port Partitioned, BDPOL=Bad (inverse) Polarity of received data

This shows the LED Output Functions for the LED Drivers when 74LS259s are used. The top table refers to the bank of 4 74LS259s latched with

STR0,

and the lower table refers to the bank of 4 74LS259s latched with

STR0. For example the RIC2A's D0 data signal goes to 259 #1 and #5. These two

74LS259s then drive the LINK LEDs.

Table 3. Status Display Pin Functions in Maximum Mode

Signal Pin Name

Function in MAXIMUM MODE

Provides status information concerning the Link Integrity status of 10BASE-T segments. This signal

should be connected to the data inputs of the chosen pair of 74LS259 latches.

Provides status information indicating if there is a collision occurring on one of the segments at-

tached to this RIC2A. This signal should be connected to the data inputs of the chosen pair of

74LS259 latches.

Provides status information indicating if one of this RIC2A's ports is receiving a data or a collision

packet from its segment. This signal should be connected to the data inputs of the chosen pair of

74LS259 latches.

Provides Status information indicating that the RIC2A has experienced a jabber protect condition.

Additionally it denotes which of its ports are partitioned. This signal should be connected to the data

inputs of the chosen pair of 74LS259 latches.

Provides status information indicating if one of this RIC2A's ports is receiving data of inverse polar-

ity. This status output is only valid if the port is configured to use its internal 10BASE-T transceiver.

The signal should be connected to the data inputs of the chosen pair of 74LS259 latches.

D(7:5)

These signals provide the repeater port address corresponding to the data available on D(4:0).

STR0

This signal is the latch enable for the lower byte latches, that is the 74LS259s which display infor-

mation concerning ports 1 to 7.

STR1

This signal is the latch enable for the upper byte latches, that is the 74LS259s which display infor-

mation concerning ports 8 to 13.

Table 4. Maximum Mode LED Definitions

74LS259 Latch Inputs = STR0

259 Output

259 Addr S2-0

000

001

010

011

100

101

110

111

RIC2A Port Number

1 (AUI)

RIC2A DO 259 #1

LINK

RIC2A D1 259 # 2

ACOL

COL

RIC2A D2 259 # 3

AREC

REC

RIC2A D3 259 # 4

JAB

PART

RIC2A D4 259 # 5

BDPOL

74LS259 (or Equiv.) Latch Inputs = STR0

259 Outputs

Q0Q1

Q2Q3

Q4Q5

Q6Q7

259 Addr S2-0

000

001

010

011

100

101

110

111

RIC2A Port Number

RIC2A DO 259 # 6

LINK

RIC2A D1 259 # 7

COL

RIC2A D2 259 # 8

REC

RIC2A D3 259 # 9

PART

RIC2A D4 259 # 10

BDPOL

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