MYSON
TECHNOLOGY
MTD907
MTD907 Revision 4.5 01/23/1997
3/14
17 AUT
I
Automatic Port
Selection
Active high input. When active, MTD907 defaults to the
AUI port if the TP link test fails. If driven low, the port
selection is determined by the PAU pin.
18 LEDR/
JABDIS
O
I
Receive LED,
Disable Jabber
Active low output driver for receiving the LED indicator.
The LED 'on’time is extended by at least 80 ms.
When externally tied or driven low, disables the internal
jabber timer.
19 LEDT/
PWDN
O
I
Transmit LED,
Power Down
Active low output driver for LED transmission indicator.
The LED 'on’time is extended by at least 80ms.
When externally tied or driven low, forces MTD907 into
power-down state.
20 LEDL/
LPSS
O
I
Link LED,
Link Pass
Active low output driver for link integrity LED indicator.
When externally tied or driven low, forces MTD907 into
'link pass' state.
21 LEDC/
FDX
O
I
Collision LED,
Full Duplex
Active low output driver for collision indicator LED. The
LED on time is extended by at least 80 ms.
When externally tied low, enables MTD907 for full duplex
operation by disabling internal TP loopback and TP
collision detection functions.
22 LBK
I
Loopback
Active high input; enables internal loopback mode.
23
33
VSS1
VSS2
-
Negative
Power Supply
Power supply ground.
24 TRST
I
Test Mode
Reset
Active high test mode reset signal. Only recognized in
test mode (TST pin high) and internally pulled low.
25 RCMPT
O
Remote
Compatible
Active high output; indicating TP transceiver at the
remote end is compatible with remote signaling.
26 RXD
O
Received Data
Output signal; recovers received data. Should be
connected directly to controller.
27 CRS
O
Carrier Sense
Output signal; detects incoming network traffic. Should
be connected directly to controller.
28 RXC
O
Received
Clock
Output signal; recovers received clock. Should be
connected directly to controller.
29 RJAB
O
Remote
Jabber
Active high output signal; indicates when the remote end
is in jabber state.
30 PLR
O
Polarity
Reversal
Active high output signal; indicates when the TP polarity
is reversed.
31
32
35
36
TPB
TPA
TNA
TNB
O
O
O
O
Twisted-pair
Transmission
Pairs A & B
Two differential driver pairs (A and B) for the TP cable.
The outputs are pre-equalized, thus no external filters
are required. The TPX pins and TNX pins must be
shorted together with a 24.9W 1% to match the 100W TP
impedance.
37 DSQ
I
Disable SQE
Active high input. When driven high, selects MTD907 for
hub/switch/repeater operation by disabling signal quality
test (heartbeat).
38
39
RDP
RDN
I
I
Receive Data
Input Pair (TP)
Differential input pair for TP cable. The reception filter is
integrated on-chip. No external filter is required.
40 PAU
I
Select
Port/AUI
Recognized only if the AUT pin is low. PAU=1 selects
AUI port, PAU=0 selects TP port. It is recommended
that you tie this pin to ground if driving AUT pin high.
41
42
DIP
DIN
I
I
AUI Reception
Pair
Differential input pair from the AUI transceiver DI circuit.
43
44
DOP
DON
O
O
AUI
Transmission
Pair
Differential output pair to the AUI transceiver DO circuit.