APR6008 datasheet(3/23 Pages) APLUS

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Voice Recording & Playback Device

Page 3

Revision 2.1

Memory Organization

The APR6008 memory array is organized to allow the great-

est flexibility in message management and digital storage.

The smallest addressable memory unit is called a “sector”.

The APR6008 contains 640 sectors.

Figure 3

Memory Map.

Sectors 0 through 639 can be used for analog storage. Du -

ring audio recording one memory cell is used per sample

clock cycle. When recording is stopped an end of data (EOD)

bit is programed into the memory. This prevents playback of

silence when partial sectors are used. Unused memory that

exists between the EOD bit and the end of the sector can not

be used.

Sectors 0 through 9 are tested and guaranteed for digital

storage. Other sectors, with the exception of sector 639, can

store data but have not been tested, and are thus not guaran-

teed to provide 100% good bits. This can be managed with

error correction or forward check-before-store methods.

Once a write cycle is initiated all previously written data in the

chosen sector is lost.

Mixing audio signals and digital data within the same sector is

not possible.

Note: There are a total of 15bits reserved for addressing. The

APR6008 only

requires 10 bits. The additional 5 bits are used

for larger devices within the APR6008 family.

SPI Interface

All memory management is handled by an external host pro-

cessor. The host processor communicates with the APR6008

through a simple Serial Peripheral Interface (SPI) Port. The

SPI port can run on as little as three wires or as many as

seven depending on the amount of control necessary. This

section will describe how to manage memory using the

APR6008

SPI Port and associated OpCode commands.

This topic is broken down into the following sections:

• Sending Commands to the Device

• OpCode Command Description

• Receiving Device Information

• Current Device Status (CDS)

• Reading the Silicon Identification (SID)

• Writing Digital Data

• Reading Digital Data

• Recording Audio Data

• Playing Back Audio Data

• Handshaking Signals

Sending Commands to the Device

This section describes the process of sending OpCodes to

the APR6008 All Opcodes are sent in the same way with the

exception of the DIG_WRITE and DIG_READ commands.

The DIG_WRITE and DIG_READ commands are described

in the Writing Digital Data and Reading Digital Data sections

that follow. The minimum SPI configuration needed to send

commands uses the DI, /CS, and SCLK pins. The device will

accept inputs on the DI pin whenever the /CS pin is low.

OpCode commands are clocked in on the rising edge of the

SPI clock. Figure 4 shows the timing diagram for shifting

OpCode commands into the device. Figure 5 is a description

of the OpCode stream.

You must wait for a command to finish executing before send-

ing a new command. This is accomplished by monitoring the /

BUSY pin. You can substitute monitoring of the busy pin by

inserting a fixed delay between commands. The required

delay is specified as T next1,Tnext2,Tnext3 or Tnext4. Figure 6

shows the timing diagram for sending consecutive com-

mands. Table 1 describes which Tnext specification to use.

Sector 0

Sector 1

Sector 639

Can Not be Used for Digital Data

SAC Trigger Point

APR6008

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