W89C982 Ver la hoja de datos (PDF) - Winbond
Número de pieza
componentes Descripción
Lista de partido
W89C982 Datasheet PDF : 28 Pages
| |||
Preliminary W89C982AF
The IMPR II provides one pin (XCOLRPT) for collision status report, two pins (M0/M1) for port status
report mode selection, and nine pins for port status report (AUIRPT, TP0-7RPT). XCOLRPT is active
when a collision occurs. Each of the nine port status report pins can directly report four aspects of the
port status. Which aspect of the network status is reported by these pins is determined by the two
mode selection pins, M1 and M0, as shown in the table below.
TP LINK/ACTIVITY
AUI COL/ACTIVITY
PARTITION
TP POLARITY
AUI LOOPBACK ERROR
UTILIZATION
UTILIZATION
M1
0
0
1
1
M0
0
1
0
1
When M0 and M1 are set to "0," the pins report TP link/activity and AUI COL/activity. In this mode, a
low output on AUIRPT and TP0-7RPT means all the TP ports are in the link fail state, a high means
all the TP ports are in link good state, and the AUI is in collision state, and a 10 Hz signal means
incoming packets are being received by the AUI/TP ports. (Note that the 10 Hz signal is still reported
if the ports are partitioned or disabled.) If M0 is set to "1" and M1 to "0," the port partition status will be
reported. In this mode, a "0" output means that all the ports are connected correctly, and a "1" means
that the AUI/TP ports are in a partition state. When M0 is set to "0" and M1 to "1," AUI loopback
errors and TP polarity status will be reported. In this mode, a "0" output means that the AUI loopback
and TP polarity are correct, and a "1" means that an AUI loopback error has been detected and the
TP port polarity is reversed. If M0 and M1 are both set to "1," the network utilization will be reported.
In this mode, each LED stands for 10% of utilization. The percentage of network utilization is shown
the following table.
% OF
UTILIZATION
AUI TP0 TP1 TP2 TP3 TP4 TP5 TP6 TP7
LED LED LED LED LED LED LED LED LED
10%
v
30%
v
v
v
50%
v
v
v
v
v
90%
v
v
v
v
v
v
v
v
v
Using pins M1 and M0 and external transistors, the IMPR II can drive LEDs to indicate the status of
the AUI/TP ports sequentially; the application circuit for the LEDs is shown below. If a simple decoder
is connected to pins M1 and M0 and a switch circuit is connected to TP0RPT to TP7RPT, the TP port
link/activity, partition, polarity, and network utilization can be displayed simultaneously.
- 10 -
Share Link: 