User's Manual

COMPANY CONFIDENTIAL
27
ETHERNET
ETH_RXN, ETH_RXP,
ETH_TXN, ETH_TXP
M
Ethernet signals between the PHY on the module and the external magnetics
(transformer). See Note 4. Maximum bit rate is 100Mbps.
ETH_LED_SPEED,
ETH_LED_ACT
O
3.3V push-pull outputs (max. ±12mA) to drive the ethernet LEDs.
100Mbps speed mode and activity are indicated by the outputs being low. Connect to LEDs
through 220ohm resistors.
USB
USB_DN, USB_DP
M
USB data signals, normally connected to type A connector, USB switch or iPod dock
connector. Maximum bit rate is USB High Speed at 480Mbps.
USB_VBUS
M
Analog input for monitoring USB type A connector power. Connect to the +5V power which
is driving the USB type A connector power pins. If this pin drops below 4.6V, then the
DM870A will drive the USBVBUSDRV signal low to control an external power MOSFET to
disconnect +5V power from the USB type A connector. See Note 5.
USBVBUSDRV
O
Logic output to control an external MOSFET that is in series with USB type A connector
power. See USB_VBUS above and Note 5.
JTAG
TMS,TCK,TDI, TDO
I/O
JTAG port for DM870A. Leave open.
SSM
SSMD4, SSMD5,
SSMD6, SSMD7
I/O
Can be used to drive external shift registers to make extended GPIO signals (see Note 6),
or as individual GPIO signals, or to make an SD card interface. SD card firmware is not
supported at present in JB2. Can be mapped to GPIO #s 08,09,10,11. Leave open if not
used.
SSMD0, SSMD1,
SSMD2, SSMD3,
SSMCLK, SSMCP,
SSMCMD, SSMWP
I/O
Used to make an SD card interface. SD card firmware is not supported at present in JB2.
Leave open.
VIDEO
AV0CLK, AV0CTRL0,
AV0CTRL1,
AV0CTRL2,
AV0DATA0, AV0DATA1,
AV0DATA2, AV0DATA3,
AV1DATA0, AV1DATA1,
AV1DATA2, AV1DATA3
O
ITU-R BT.656 digital video output signals. Optionally used to make a TVout menu display,
or to display decoded album art. Can be connected to video D/A converter (see Note 7), or
connected to a video DSP.