Datasheet

DP83849IF
www.ti.com SNOSAX8D –JUNE 2009–REVISED APRIL 2013
3.10 10 Mb/s AND 100 Mb/s PMD INTERFACE
Signal Name Type Pin # Description
TPTDM_A/FXTDM_A I/O 26 10BASE-T or 100BASE-TX or 100BASE-FX Transmit Data
TPTDP_A/FXTDP_A 27 In 10BASE-T or 100BASE-TX: Differential common driver transmit output
TPTDM_B/FXTDM_B 36 (PMD Output Pair). These differential outputs are automatically configured to
TPTDP_B/FXTDP_B 35 either 10BASE-T or 100BASE-TX signaling.
In Auto-MDIX mode of operation, this pair can be used as the Receive Input
pair.
In 100BASE-FX mode, this pair becomes the 100BASE-FX Transmit pair.
These pins require 3.3V bias for operation.
TPRDM_A/FXRDM_A I/O 23 10BASE-T or 100BASE-TX or 100BASE-FX Receive Data
TPRDP_A/FXRDP_A 24 In 10BASE-T or 100BASE-TX: Differential receive input (PMD Input Pair).
TPRDM_B/FXRDM_B 39 These differential inputs are automatically configured to accept either
TPRDP_B/FXRDP_B 38 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.
FXSD_A(LED_SPEED_A/ANA) I 20 FX Signal Detect: This pin provides the Signal Detect input for 100BASE-FX
FXSD_B(LED_SPEED_B/AN1_B) 42 mode.
3.11 SPECIAL CONNECTIONS
Signal Name Type Pin # Description
RBIAS I 32 Bias Resistor Connection: A 4.87 kΩ 1% resistor should be connected from RBIAS to
GND.
PFBOUT O 31 Power Feedback Output: Parallel caps, 10µF and 0.1µF, should be placed close to the
PFBOUT. Connect this pin to PFBIN1 (pin 13), PFBIN2 (pin 27), PFBIN3 (pin 35), PFBIN4
(pin 49). See Section 8.5 for proper placement pin.
PFBIN1 I 7 Power Feedback Input: These pins are fed with power from PFBOUT pin. A small capacitor
PFBIN2 28 of 0.1µF should be connected close to each pin
(1)
.
PFBIN3 34
PFBIN4 54
(1) Do not supply power to these pins other than from PFBOUT.
3.12 POWER SUPPLY PINS
Signal Name Pin # Description
IOVDD1, IOVDD2, IOVDD3, IOVDD4 11,51,65,78 I/O 3.3V Supply
IOGND1, IOGND2, IOGND3, IOGND4 10,52,64,77 I/O Ground
COREGND1, COREGND2 6,55 Core Ground
CDGND1, CDGND2 25,37 CD Ground
ANA33VDD 30 Analog 3.3V Supply
ANAGND1, ANAGND2, ANAGND3, ANAGND4 22,29,33,40 Analog Ground
Copyright © 2009–2013, Texas Instruments Incorporated Pin Descriptions 13
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