Analog Devices ADSP-21535 E-KIT LITE system manual External Bus Interface, SPORT0 Audio Interface

4.2.1External Bus Interface

The External Bus Interface Unit (EBIU) is connected to 4M x 32 bits of SDRAM (16 MB). This memory is connected to the synchronous memory select 0 (~SMS0) pin. Refer to section 3.4 for information about configuring the

SDRAM.

The EBIU is also connected to 272K x 16 bits of flash memory. This memory is connected to the asynchronous memory select (~AMS0) pin. The DSP can use this memory both for booting and storing information during normal operation. Refer to section 3.5 for information about using the flash memory.

All of the address, data, and control signals are available externally via the extender connectors (P1-3). The pinout of these connectors can be found in

APPENDIX B: SCHEMATIC.

4.2.2SPORT0 – Audio Interface

SPORT0). is connected to the AD1885 SoundMAX Codec (U7). Two 3.5mm stereo jacks (P5, P6) allow audio to be input and output. You can supply an audio input to the Codec microphone input channel (MIC1) or to the stereo LINE_IN input channel. The jumper settings of JP1 determine the Codec channel driven by the input jack (P5). For information about configuring JP1, see section 4.3.1.

SPORT0 is also routed to an off-board connector (P9). When using the off-board connector, the Codec must be held in reset, so that it does not drive any of the SPORT0 signals. The Codec can be held in reset by driving PF15 low or by setting up JP2 to always hold the Codec in reset (see section 4.3.2). PF15 must be pulled HI (1) for the Codec to function.

!NOTE: TCLK0 and RCLK0 pins are shorted together using R114 and R118.

ADSP-21535 EZ-KIT Lite Evaluation System Manual 4-3