LM3S9B81 Datasheet, PDF (814/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Ethernet Controller
the transmit FIFO, and then to initiate the transfer with a software request. An interrupt occurs when
this transfer is complete. For both channels, the "auto-request" transfer mode should be used. See
“Micro Direct Memory Access (μDMA)” on page 236 for more details about programming the µDMA
controller.
19.4
19.4.1
Initialization and Configuration
The following sections describe the hardware and software configuration required to set up the
Ethernet Controller.
Hardware Configuration
Figure 19-4 on page 814 shows the proper method for interfacing the Ethernet Controller to a
10/100BASE-T Ethernet jack.
Figure 19-4. Interface to an Ethernet Jack
Stellaris
Microcontroller
PF2/LED1
PF3/LED0
60
59
MDIO ⁵⁸
TXOP ⁴³
PF2/LED1
PF3/LED0
+3.3V
R3
10K
+3.3V
R4 R5
49.9 49.9
C2
C3
10pF 10pF
TXON ⁴⁶
RXIP ⁴⁰
RXIN ³⁷
R8 R9
49.9 49.9
+3.3V
C6
C7
10pF 10pF
C13
0.01UF
10/100BASE-T Ethernet Jack
P2
+3.3V
12 ^G+
R6
11 ^G-
330
3 1CT: 1
C4 +3.3V
5
0.1UF
4
TX+ ₁
TX- ₂
RX+ ₃
4
7 1CT: 1
C5 +3.3V
6
5
RX- ₆
7
8
0.1UF
8
R7 ^+3.3V _{2 Y-}
330
1
Y+
9 NC
10 GND
J3011G21DNL
The following isolation transformers have been tested and are known to successfully interface to
the Ethernet PHY layer.
■ Isolation Transformers
– TDK TLA-6T103
– TDK TLA-6T118
– Bel-Fuse S558-5999-46
– Halo TG22-3506ND
– Halo TG110-S050
– PCA EPF8023G
– Pulse PE-68515
– Valor ST6118
– YCL 20PMT04
■ Isolation transformers with integrated RJ45 connector
– TDK TLA-6T704
– Delta RJS-1A08T089A
814
June 29, 2010
Texas Instruments-Advance Information