APR6016 datasheet(10/24 Pages) APLUS

10 / 24 page

Preliminary

APR6016 Data Sheet

Page 10

Voice Recording & Playback Device

Revision 1.0

Writing Digital Data

Digital data is written into the device using the DIG_WRITE

command. No mixing of analog data and digital data within a

sector is possible. Sectors 0 through 9 are tested and guar-

anteed for digital storage. Other sectors, with the exception of

sector 1279, can store data but have not been tested, and

are thus not guaranteed to provide 100% good bits. This can

be managed with error correction or forward check-before-

store methods. Issuing a DIG_ERASE command on sector

1279 will cause data throughout all sectors to be lost.

A sector must be erased, using the DIG_ERASE command,

before digital data can be written to it. This requirement is

necessary whether analog data or digital data was previously

stored in the sector. A sector should not be erased more than

once between analog or digital write operations. Executing

multiple erase operations on a sector will permanently dam-

age the sector. A sector can be reallocated to either analog

storage or digital storage at any time.

The process of storing digital data begins by sending a

DIG_WRITE command. The DIG_WRITE command is fol-

lowed immediately by four buffer bits. These bits will not be

stored in the array and must be considered don’t care bits.

Immediately following the four buffer bits should be the data

that you wish to store. All 3004 bits must be stored. Four

additional buffer bits must be clocked into the device follow-

ing the stored data. These bits will not be stored in the array

and must be considered don’t care bits. Ending a digital write

command early will permanently damage the sector.

The DO pin will clock out the normal 20 bit CDS followed by

five don’t care bits, a copy of the 3004 data bits, and finally

three don’t care bits.

Figure 11 shows a timing diagram which describes the digital

storage process. All timing with the exception of TpSCLK

should adhere to the specifications given in Figure 4 and Fig-

ure 7. The TpSCLK specification is replaced by the DTpSCLK

when storing digital data.

The /BUSY pin indicates when a

DIG_WRITE is taking place.

Note: The DIG_ERASE command should not be used before

storing analog data. The device will perform its own internal

erase before analog storage.

Figure 11 does not show the DIG_ERASE command which

must be executed on a sector before digital data can be

stored.

Figure 11 Writing Digital Data

/C S

SC LK

D I

CDS

Copy of the input data (delayed one clock cycle)

Four Don’t Care Bits

Total 3032 clock cycles

DIG_WRITECOMMAND

3004 bits of data to be stored

/BUSY

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