SAM2695 datasheet(13/44 Pages) ETC1

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SAM2695

SAM2695 USER’S MANUAL

1- PARALLEL AND SERIAL MIDI MODES

The SAM2695 can be controlled both from the parallel interface (D0-D7, CS/, WR/, RD/, INT)

or from the serial MIDI interface (MIDI IN).

The parallel Interface consists of two byte registers and one IRQ (interrupt request) line:

I/O address

Write from host

Read to host

A0 = 0

DATA8

A0 = 1

CONTROL

STATUS

Status Register

TE RF X

: Transmit empty.

If 0, data from SAM2695 to host is pending and IRQ is high.

When host is reading the data in DATA8 register (A0 = 0), TE goes to1 and IRQ is low

again.

: Receiver full.

If 0 then SAM2695 is ready to accept CONTROL or DATA from host. However,

minimum time between two consecutive writes must be 3.5 µs (even if RF is not set).

1-1- SERIAL & PARALLEL MODES

Serial mode:

After power-up, hardware reset or parallel reset control, the SAM2695 is in serial mode:

In this mode, the parallel MIDI interface is inactive and the IRQ line is floating. The serial

MIDI IN is connected to the synthesis.

In serial mode, the 8-bit parallel interface accepts two controls:

 3Fh to switch to parallel mode

SAM2695 is acknowledging 3Fh control by sending to host FEh in DATA8 register.

 BEh to send any control (see list of control message in chapter 2-2).

BEh allows to send only one control, which means that each control sent in serial mode

should start with BEh control.

Parallel mode:

In parallel mode, all data received by SAM2695 on its serial MIDI IN pin is sent to host

through the 8-bit register DATA8 but is not sent to synthesis.

Midi Data received by SAM2695 from host through register DATA8 is sent to the synthesis.

Parallel mode accepts following controls:

 FFh (parallel mode reset) switch back to serial mode.

 Additional controls listed in paragraph 2.2.

These additional controls, being independent of the MIDI data flow, allow to easily insert

some special messages (for controlling some SAM2695 effect modules), in the middle of

a MIDI data flow.

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