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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 2 C serial
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.
2.6 I 2 C Interface
The I 2 C bus on the DM6437 is ideal for interfacing to the control registers of many
devices. On the DM6437 EVM the I 2 C bus is used to configure the video decoder,
stereo Codec, I/O expanders. An I 2 C ROM is also interfaced via the serial bus. The
format of the bus is shown in the figure below.
Start Slave Address W
ACK Sub Address ACK-S Data ACK-S Stop
Write Sequence
Start Slave Address R
Data
STOP
Read Sequence
Figure 2-4, I 2 C Bus Format
The addresses of the on board peripherals are shown in the table below.
Table 1: I 2 C Memory Map
Device
TVP5146M2
PCF 8574A
PCF 8574A
PCF 8574A
PCF8574A
TLV320AIC33
24WC256
Address
0x5D
0x38
0x39
0x3A
0x3B
0x1B
0x50
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Device
U50
U10
U11
U13
U64
U43
U25
Function
Video Decoder
User Input
User LEDs
PLL, User I/O
User I/O
CODEC
I 2 C EEPROM
2-6
DM6437 EVM Technical Reference
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