78Q2120 データシートの表示（PDF） - TDK Corporation
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78Q2120 Datasheet PDF : 33 Pages
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78Q2120
10/100BASE-TX
Ethernet Transceiver
CONTROL AND STATUS (continued)
PIN
ANEGA
TECH[2:0]
RPTR
64-PIN
47
44-46
50
80-PIN
56
53-55
61
TYPE
I
I
I
DESCRIPTION
AUTO-NEGOTIATION ABILITY: Strapped to logic high to allow auto-
negotiation function. When strapped to logic low, auto-negotiation
logic is disabled and manual technology selection is done through
TECH[2:0]. This pin is reflected as ANEGA bit (MR1.3).
TECHNOLOGY ABILITY/SELECT: TECH[2:0] sets the technology ability of the
chip which is reflected in MR0.13,8 MR1.14:11 and MR4.12:5.
TECH[2:0]
Technology ability
000
Advertise no technology capability; however,
parallel detect from the link partner will
establish the link speed.
111
Both 10BASE-T and 100BASE-TX,
Both half and full duplex
001
10BASE-T, half duplex
010
100BASE-TX, half duplex
011
Both 10BASE-T and 100BASE-TX,half duplex
100
None
101
10BASE-T Both half and full duplex
110
100BASE-TX Both half and full duplex
REPEATER MODE: When pulled high, this pin puts the chip into repeater
mode. In this mode, full duplex is prohibited, CRS responds to receive
activity only and, in 10BASE-T mode, the SQE test function is disabled. This
mode can also be entered with MR16.15.
MDI (MEDIA DEPENDENT INTERFACE)
TXOP,
TXON
RXIP,
RXIN
61, 62 77,78
52, 51 64,63
A TRANSMIT OUTPUT POSITIVE/NEGATIVE: Transmitter outputs for
both 10BASE-T and 100BASE-TX.
A RECEIVE INPUT POSITIVE/NEGATIVE: Receiver inputs for both
10BASE-T and 100BASE-TX.
LED INDICATORS
The LED pins use standard logic drivers. They output a logic low when the LED is meant to be on and a logic high when it is
meant to be off. The LED should be connected in series with a resistor between the output pin and the power supply.
LEDL
40
48
O LED LINK: ON for link up.
LEDTX
39
47
O LED TRANSMIT: ON when there is a transmission (normally OFF).
LEDRX
38
46
O LED RECEIVE: ON when there is a reception (normally OFF).
LEDCOL
37
45
O LED COLLISION: In half duplex mode, this is a collision indicator and turns-
ON when a collision occurs. In full duplex mode, this LED is held OFF.
LEDBTX
36
44
O LED 100BASE-TX: ON for 100BASE-TX connection and OFF for
other connections. LEDBTX is OFF during auto-negotiation.
LEDBT
48
57
O LED 10BASE-T: ON for 10BASE-T connection and OFF for other
connections. LEDBT is OFF during auto-negotiation.
LEDFDX
49
58
O LED FULL DUPLEX: ON when in full duplex mode and OFF when in
half duplex mode.
8
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