NWK954
LED Drivers
Signal
Pin no.
Type
Standard
Description
COLLED_N
109
Collision LED. Drives an LED to indicate that a collision
digital output
has occurred either locally or elsewhere in the stack.
P0_RXLED_N
P1_RXLED_N
P2_RXLED_N
P3_RXLED_N
124
122
120
118
Standard
digital output
Port 0 activity LED. Drives an LED to indicate link/activity
on port 0. The LED is turned on when a link is established
and flashes off when a packet is being received.
Standard
digital output
Port 1 activity LED. Drives an LED to indicate link/activity on
port 1. The LED is turned on when a link is established and
flashes off when a packet is being received.
Standard
digital output
Port 2 actlvlty LED. Drives an LED to indicate link/activity on
port 2. The LED is turned on when a link is established and
flashes off when a packet is being received.
Standard
digital output
Port 3 activlty LED. Drives an LED to indicate link/activity on
port 3. The LED is turned on when a link is established and
flashes off when a packet is being received.
P0_ERLED_N
P1_ERLED_N
P2_ERLED_N
P3_ERLED_N
123
121
119
117
Standard
digital output
Port 0 error LED. Drives an LED to indicate an error on
port 0. See the text for a full description.
Standard
digital output
Port 1 error LED. Drives an LED to indicate an error on
port 1. See the text for a full description.
Standard
digital output
Port 2 error LED. Drives an LED to indicate an error on
port 2. See the text for a full description.
Standard
Port 3 error LED. Drives an LED to indicate an error on
digital output
port 3. See the text for a full description.
ACTLED_N4
ACTLED_N3
ACTLED_N2
ACTLED_N1
ACTLED_N0
116
115
114
113
112
Standard
digital outputs
Utilization LEDs. Drives 5 LEDs to indicate utilization of the
network segment. See the text for a full description.
Table 6
Clocks and Controls
Signal
Pin no.
Type
Description
TXCLKIN
86
Digital input
no pull-up
25MHz reference clock. Supplied from an external source
to all NWK954s on the local expansion bus.
RESET_N
5
Open drain
Asynchronous reset. This signal is driven low by the on-
chip power-on reset circuit, but may also be driven low
externally for manual reset. Must be pulled high by an
external 5kΩ resistor.
digital output and
digital input,
no pull-up
PSEN0
PSEN1
87
88
Digital inputs
with pull-ups
Power-savlng enables. 11 enables power-saving on all
ports. 01 suppresses power saving on port 0, 10
suppresses power saving on port 3, 00 suppresses power-
saving on all ports.
TA4
TA3
TA2
13
14
15
Digital inputs,
no pull-ups
Scrambler seed. Each ot the four PHY modules in the
NWK954 is provided with a unique scrambler seed derived
from TA[4:2]. To ensure that all ot the local PHYs have
unique scrambler seeds, each NWK954 connected to the
local expansion bus should have its TA[4:2] input set to a
unique value by connecting to DIGVDD or DIGGND.
Table 7
11
MITEL [ MITEL NETWORKS CORPORATION ]
