Spectrum Digital TMS320DM365, Техническое описание

Страница: 42 / 140

Spectrum Digital, Inc
2-24 DM365 EVM Technical Reference
2.7 Ethernet Interface
The DM365 incorporates an internal MII ethernet MAC which interfaces to a
Mircel 10/100 ethernet Phy. The 10/100 Mbit interface is isolated and brought out to a
RJ-45 standard ethernet connector, P2. The ethernet address is stored in the on board
I
2
C EEPROM manufacturing.
For GPIO modes of operation when the MII interface is not used CBTLV multiplexes
and directs the I/O to the on board CPLD used as imager expansion I/Os.
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.
2.8 I
2
C Interface
The I
2
C bus on the DM365 is ideal for interfacing to the control registers of many
devices. On the DM365 EVM the I
2
C bus is used to configure the video decoders,
stereo Codec, video amplifiers, I2C EEPROM, and communicate with the MSP430.
An I
2
C ROM is also interfaced via the serial bus. The format of the bus is shown in the
figure below.
The addresses of the on board peripherals are shown in the table below.
Table 27: I
2
C Memory Map
Device Address R/W Function
AIC3101 0x18 R/W CODEC
MSP430 0x25 R/W IR Controller
THS7303 0x2C R/W Video Output Amplifier
THS7353 0x2E R/W Video Input Amplifier
CAT24C256 0x50 R/W
I
2
C EEROM
TVP7002 0x5C R/W Component Decoder
TVP5146 0x5D R/W Composite 1 Decoder
Figure 2-3, I
2
C Bus Format
Start Slave Address W ACK Sub Address ACK-S Data ACK-S Stop
Write Sequence
Start Slave Address R Data STOP
Read Sequence