9 AUDIO INTERFACE AUDIO SAMPLING RATE AND PLL COMPONENT
CONFIGURATION
The ES66x8 Vibratto II audio mode configuration is selectable, allowing it to interface directly with
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low-cost audio DACs and ADCs. The audio port provides a standard IS interface input and output and S/PDIF
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(IEC958) audio output. Stereo mode is in IS format while six channels Dolby Digital (5.1 channel) audio output
can be channeled through the S/PDIF. The S/PD IF interface consists of a bi -phase mark encoder, which has low
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skew. The transmit IS interface supports the 128, 192, 256, 384, and 512 sampling frequency formats, where
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sampling frequency Fs is usually 32 kHz, 44.1 kHz, 48 kHz, 96 kHz, or 192 kHz. The audio samples for the IS
transmit interface can be 16, 18, 20, 24, and 32 -bit samples.
For Linear PCM audio stream format, the Vibratto II supports 48 kHz and 96 kHz. Dolby Digital audio
only supports 48 kHz. The ES66x8 Vibratto II incorporates a built -in programmable analog PLL in the device
architecture in order to generate a master audio clock. The MCLK pin is for the audio DAC clock and can either
be an output from or an input to the ES66x8 Vibratto II . Audio data out (TSD) and audio frame sync (TWS) are
clocked out of the Vibratto II based on the audio transmit bit clock (TBCK). Audio receive bit clock (RBCK) is
used to clock in audio data in (RSD) and audio receive frame sync (RWS).
10 FRONT PANEL
10.1 VFD CONTROLLER
The VFD controller is a PTC PT6311. This controller is not a processor, but does include a simple state
machine which scans the VFD and reads the front panel button matrix. The 6311 also includes RAM so it can
store the current state of all the VFD icon s and segments. Therefore, the 6311 need only be accessed when the
VFD status changes and when the button status is read. The E S66x8 can control this chip directly using PIO pins
or can allow the front panel PIC to control the VFD.
11 MISCELLANEOUS FUNCTIONS
11.1 RESET CIRCUITRY
Two di fferent chips are supported to provide the power-on-reset and pushbutton reset function:
AAT3521 or V6300 .
12 CONNECTORS
12.1 SCART CONNECTORS
Pinout of the scart connector:
1 ? Audio Right Out
2 ? Audio Right In
3 ? Audio Left / Monu Out
4 ? Audio Gnd
5 ? Blue Gnd
6 ? Audio Left / Mono In
7 ? Blue
8 ? Control Voltage
9 ? Green Gnd
10 ? Comms Data 2
11 ? Green
13 |
ACEC
