8
6. FLASH M
EMORY
The decoder board supports 70ns Flash memories. Currently 4 configurations are supported:
FLASH_512K_8b
FLASH_1024K_8b
FLASH_512Kx2_8b
FLASH_512Kx2_16b
The MT1379 permits both 8- and 16-bit common memory I/O accesses with a removable storage
card via the host interface.
7. S
ERIAL
EEPROM M
EMORY
An I2C serial EEPROM is used to store user configuration (i.e. language preferences,
speaker setup, etc.) and software configuration.. Industry standard EEPROM range in size from
1kbit to 256kbit and share the same IC footprint and pinout. The default device is 2kbit, 256kx 8,
SOIC8 SGS Thomson ST24C02M1 or equivalent.
8. A
UDIO
I
NTERFACE
A
UDIO
S
AMPLING
R
ATE AND
PLL C
OMPONENT
C
ONFIGURATION
The MT1379 audio mode configuration is selectable, allowing it to interface directly with
low-cost audio DACs and ADCs. The audio port provides a standard I
2
S interface input and
output and S/PDIF (IEC958) audio output. Stereo mode is in I
2
S format while six channels Dolby
Digital (5.1 channel) audio output can be channeled through the S/PDIF. The S/PDIF interface
consists of a bi-phase mark encoder, which has low skew. The transmit I
2
S interface supports the
112, 128, 192, 256, 384, and 512 sampling frequency formats, where sampling frequency Fs is
usually 32 kHz, 44.1 kHz, 48 kHz, 96 kHz, or 192 kHz. The audio samples for the I
2
S transmit
interface can be 16, 18, 20, 24, and 32-bit samples.
For Linear PCM audio stream format, the MT1379 supports 48 kHz and 96 kHz. Dolby
Digital audio only supports 48 kHz. The MT1379 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 MT1379. Audio data out
(TSD) and audio frame sync (TWS) are clocked out of the MT1379 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).
9. F
RONT
P
ANEL
9.1 VFD C
ONTROLLER
The VFD controller is a NEC uPD16311. 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
16311 also includes RAM so it can store the current state of all the VFD icons and segments.
Therefore, the 16311 need only be accessed when the VFD status changes and when the button
status is read. The MT1379 can control this chip directly using PIO pins or can allow the front
panel PIC to control the VFD.
