DP83953 Datasheet, PDF (9/90 Pages) National Semiconductor (TI) – Repeater Interface Controller with Security Features, Internal Drivers and Integrated Filters

2.0 Pin Descriptions (Continued)
Pin Name
Pin No.
Driver
Type
I/O
Description
Management Bus Pins
MRXC
59
TT O,Z MANAGEMENT RECEIVE CLOCK: When asserted this signal pro-
vides a clock signal for the MRXD serial data stream. The MRXD
signal is changed on the falling edge of this clock. The signal is as-
serted when a RIC2A is receiving data from one of its network seg-
ments. Otherwise the signal is inactive.
MCRS
56
TT B,Z MANAGEMENT CARRIER SENSE: When asserted this signal pro-
vides an activity framing enable for the serial data stream. The sig-
nal is asserted when a RIC2A is receiving data from one of its
network segments. Otherwise the signal is an input.
MRXD
57
TT O,Z MANAGEMENT RECEIVE DATA: When asserted this signal pro-
vides a serial data stream in NRZ format. The data stream is made
up of the data packet and RIC2A status information. The signal is
asserted when a RIC2A is receiving data from one of its network
segments. Otherwise the signal is inactive.
MEN
58
C O MANAGEMENT BUS OUTPUT ENABLE: This output acts as an ac-
tive high enable for an external bus transceiver (if required) for the
MRXC, MCRS and MRXD signals. When high the bus transceiver
should be transmitting on to the bus.
PCOMP
50
TT I PACKET COMPRESS: This input is used to activate the RIC2A's
packet compress logic. A low level on this signal when MCRS is ac-
tive will cause that packet to be compressed. If PCOMP is tied low
all packets are compressed, if PCOMP is tied high packet compres-
sion is inhibited.
External Decoder Pins
RXMPLL
71
TT O RECEVE DATA MANCHESTER FORMAT: This output makes the
data, in Manchester format, received by port N available for test pur-
poses. If not used for testing this pin should be left open.
Test Pins
TEST_(12:7)
154-159
TT I Factory test control pins - this pin should be connected to GND for
proper operation of the repeater.
TEST_(6:2)
44-48
TT I Factory test control pins - this pin should be connected to GND for
proper operation of the repeater.
TEST_1
2
TT O Factory test control pins - this pin should be left unconnected for
proper operation of the repeater.
Power and Ground Pins
V_DD
GND
1, 55, 65, 74, 80, 102
54, 64, 73, 79, 101,
160
Positive Supply
Negative Supply
V_DDA
7
GNDA
6
Positive Supply for Analog circuitry
Negative Supply for Analog circuitry
V_DDPLL
94
GNDPLL
93
Positive Supply for Phase Lock Loop
Negative Supply for Phase Lock Loop
V_DDWS
152
GNDWS
151
Positive Supply for Wave Shape circuitry
Negative Supply for Wave Shape circuitry
V_DD P_n
10, 17, 22, 29, 34, 41,
117, 124, 129, 136,
141, 148
Positive supply for port N. Connect for all ports.
GND P_n
11, 16, 23, 28, 35, 40,
118, 123, 130, 135,
142, 147
Negative supply for port N. Connect for all ports.
V_DD AUI
108
GND AUI
107
Positive supply for AUI port.
Negative supply for AUI port.
TT = TTL compatible, B = Bi-directional, C = CMOS compatible, OD = Open Drain, I = Input, O = Output,
Z = high impedance
9
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