DP83950B datasheet(40/80 Pages) NSC

40 / 80 page

50 Functional Description (Continued)

Table 53 Status Display Pin Functions in MAXIMUM MODE

Signal Pin

Function in Maximum Mode

Name

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 attached to this RIC

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

Provides status information indicating if one of this RIC’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 RIC 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 RIC’s ports is receiving data of inverse polarity 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(75)

These signals provide the repeater port address corresponding to the data available on D(40)

STR0

This signal is the latch enable for the lower byte latches that is the 74LS259s which display information concerning

ports 1 to 7

STR1

This signal is the latch enable for the upper byte latches that is the 74LS259s which display information concerning

ports 8 to 13

Maximum Mode LED Definitions

74LS259 Latch Inputs e STR0

259 Output

259 Addr S2 – 0

000

001

010

011

100

101

110

111

RIC Port Number

1 (AUI)

RIC D0 259

LINK

RIC D1 259

ACOL

COL

RIC D2 259

AREC

REC

RIC D3 259

JAB

PART

RIC D4 259

BDPOL

74LS259 (or Equiv) Latch Inputs e STR1

259 Output

259 Addr S2 – 0

000

001

010

011

100

101

110

111

RIC Port Number

RIC D0 259

LINK

RIC D1 259

COL

RIC D2 259

REC

RIC D3 259

PART

RIC D4 259

BDPOL

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 STR1 For example the RIC’s D0 data signal goes to 259

1 and

5 These two 74LS259s then drive the

LINK LEDs)

Note

ACOL e Any Port Collision AREC e Any Port Reception JAB e Any Port Jabbering LINK e Port Link COL e Port Collision REC e Port Reception

PART e Port Partitioned BDPOL e Bad (inverse) Polarity or received data

FIGURE 512

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