ConnectCore for i.MX51
©2011DigiInternational,Inc. 50
RTC
The ConnectCore for i.MX51 provides a Real Time Clock and a Secure Real Time clock.
The real time clock function is provided including time and day counters as well as an alarm
function. The RTC utilizes the 32.768KHz crystal oscillator for the time base and is powered
by the coin cell backup supply when main supply has dropped below operational range. In
configurations where the SRTC is used, the RTC can be disabled to conserve current drain.
The accuracy of the 32.768KHz crystal used for the Real-Time Clock is ±20ppm.
RTC accuracy ±20ppm
17-bit time of day counter
15-bit day counter
Time of day alarm
Day alarm
The secure real time clock helps to comply with issues arising out of different applications
requiring secure and certifiable time, for example Digital Rights Management (DRM)
schemes.
The main features of the secure RTC interface are the following:
Secure 47-bit time counter
Non-secure 47-bit time counter
Use-mode protection. The SRTC cannot be configured by non-secured SW.
Re-programming protection. The SRTC cannot be altered or disabled after SRTC
locked.
Clock source protection
Programmable secure and non-secure alarms with interrupt
SPDIF
The ConnectCore for i.MX51 has a Sony/Philips Digital Interface Transmitter (SPDIF Tx) audio
module that allows the processor to transmit digital audio over it.
For the SPDIF transmitter, the audio data is provided by the processor. Zero is always inserted
in the user data. The SPDIF transmitter generates a SPDIF output bitstream in the biphase
mark format (IEC958), which consists of audio data, channel status, and user data. In the
SPDIF transmitter, the IEC958 biphase bit stream is generated on both edges of the SPDIF
transmit clock.
IEC 60958 format SPIDF output
7 transmit clock source
Consumer channel status support
Support for interrupt and DMA
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