Ethernet Interface - Spectrum Digital TMS320DM6437 Technical Reference

Spectrum Digital, Inc

2.5 Ethernet Interface

The DM6437 integrates an ethernet MAC on chip. This interface is routed to the PHY
via CBT switches. The EVM uses an Micrel KS8001L PHY. The 10/100 Mbit
interface is isolated and brought out to a RJ-45 standard ethernet connector, P3. The
PHY directly interfaces to the DM6437. The ethernet address is stored in the I
ROM during manufacturing.
The RJ-45 has 2 LEDs integrated into its connector. The LEDs are green and yellow
and indicate the status of the ethernet link. The green LED, when on, indicates link and
when blinking indicates link activity. The yellow LED, when illuminated, indicates full
duplex mode.
2
2.6 I C Interface
2
The I C bus on the DM6437 is ideal for interfacing to the control registers of many
devices. On the DM6437 EVM the I
stereo Codec, I/O expanders. An I
format of the bus is shown in the figure below.
Start Slave Address W
The addresses of the on board peripherals are shown in the table below.
Device
TVP5146M2
PCF 8574A
PCF 8574A
PCF 8574A
PCF8574A
TLV320AIC33
24WC256
2-6
2
C bus is used to configure the video decoder,
2
C ROM is also interfaced via the serial bus. The
ACK Sub Address ACK-S Data ACK-S Stop
Write Sequence
Start Slave Address R
Read Sequence
Figure 2-4, I
2
Table 1: I C Memory Map
Address R/W
0x5D R/W
0x38 R/W
0x39 R/W
0x3A R/W
0x3B R/W
0x1B R/W
0x50 R/W
Data STOP
2
C Bus Format
Device Function
U50 Video Decoder
U10 User Input
U11 User LEDs
U13 PLL, User I/O
U64 User I/O
U43 CODEC
U25 2
I C EEPROM
DM6437 EVM Technical Reference
2
C serial