Toshiba TDP-D1 Service Manual page 98

Sync Valid Indicator - SYNCVAL
SYNCVAL indicates when the data and control signals of the digital component interface are
valid and the signals correspond to the configuration loaded over the control interface. If SYNCVAL
is low, the signals on the digital component interface are ignored and a Video Curtain is displayed.
The color of the video curtain is programmable via the control interface. When SYNCVAL is high
the DDP1000 electronics will display an image corresponding to the digital component interface
signals and the configuration loaded over the control interface. If the digital component interface
signals or configuration is invalid when SYNCVAL is high erroneous data will be displayed.
I2C Control Interface Definition
The DDP1000 electronics control interface supports a single I2C interface up to 400KHz. This
interface is used to control and configure the DDP1000 electronics. The DDP1000 electronics' Flash
memory can also be reprogrammed over the I2C interface. For Interface definition, see the I2C bus
specification. The software command interface is defined in the DDP1000 Software Interface
Control Document.
USB Interface Definition
The DDP1000 electronics supports an optional USB, slave only, version 1.1 interface for
reprogramming the Flash memory via bulk data transfers. To utilize the USB interface a 48MHz
clock must be provided on the USBCLK pin on the DDP1000 ASIC. See the Universal Serial Bus
specification for further information.
Master Clock
The DDP1000 ASIC requires a 100MHz master clock. For single DDP1000 ASIC
configurations, this clock can be generated either by a crystal or an oscillator. See the DDP1000
customer datasheet for detailed requirements. An oscillator and clock buffer are recommended for a
2 DDP1000 ASIC SXGA system. See reference design schematics for circuit details.
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