DP83849ID_08 Datasheet, PDF (15/98 Pages) National Semiconductor (TI) – PHYTER® DUAL Industrial Temperature with Fiber Support (FX) Dual Port 10/100 Mb/s Ethernet Physical Layer Transceiver

1.8 10 Mb/s and 100 Mb/s PMD Interface
Signal Name
TPTDM_A/FXTDM_A
TPTDP_A/FXTDP_A
TPTDM_B/FXTDM_B
TPTDP_B/FXTDP_B
Type
I/O
TPRDM_A/FXRDM_A
I/O
TPRDP_A/FXRDP_A
TPRDM_B/FXRDM_B
TPRDP_B/FXRDP_B
FXSD_A
I
(LED_SPEED_A/AN1_A)
FXSD_B
(LED_SPEED_B/AN1_B)
1.9 Special Connections
Pin #
26
27
36
35
23
24
39
38
20
42
Description
10BASE-T or 100BASE-TX or 100BASE-FX Transmit Data
In 10BASE-T or 100BASE-TX: Differential common driver trans-
mit output (PMD Output Pair). These differential outputs are auto-
matically configured to either 10BASE-T or 100BASE-TX
signaling.
In Auto-MDIX mode of operation, this pair can be used as the Re-
ceive Input pair.
In 100BASE-FX mode, this pair becomes the 100BASE-FX
Transmit pair.
These pins require 3.3V bias for operation.
10BASE-T or 100BASE-TX or 100BASE-FX Receive Data
In 10BASE-T or 100BASE-TX: Differential receive input (PMD In-
put Pair). These differential inputs are automatically configured to
accept either 100BASE-TX or 10BASE-T signaling.
In Auto-MDIX mode of operation, this pair can be used as the
Transmit Output pair.
In 100BASE-FX mode, this pair becomes the 100BASE-FX
Receive pair.
These pins require 3.3V bias for operation.
FX Signal Detect: This pin provides the Signal Detect input for
100BASE-FX mode.
Signal Name
RBIAS
PFBOUT
Type
I
O
PFBIN1
I
PFBIN2
PFBIN3
PFBIN4
1.10 Power Supply Pins
Pin #
32
31
7
28
34
54
Description
Bias Resistor Connection. A 4.87 kΩ 1% resistor should be con-
nected from RBIAS to GND.
Power Feedback Output. Parallel caps, 10µ F and 0.1µF, should
be placed close to the PFBOUT. Connect this pin to PFBIN1 (pin
13), PFBIN2 (pin 27), PFBIN3 (pin35), PFBIN4 (pin 49). See
Section 5.5 for proper placement pin.
Power Feedback Input. These pins are fed with power from
PFBOUT pin. A small capacitor of 0.1µF should be connected
close to each pin.
Note: Do not supply power to these pins other than from
PFBOUT.
Signal Name
IOVDD1, IOVDD2, IOVDD3,
IOVDD4
IOGND1, IOGND2,
IOGND3, IOGND4
COREGND1, COREGND2
CDGND1, CDGND2
ANA33VDD
ANAGND1, ANAGND2,
ANAGND3, ANAGND4
Pin #
11,51,65,78
10,52,64,77
6,55
25,37
30
22,29,33,40
I/O 3.3V Supply
I/O Ground
Core Ground
CD Ground
Analog 3.3V Supply
Analog Ground
Description
15
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