ISD-T360SB Datasheet, PDF(15/109 Page) List of Unclassifed Manufacturers – VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support

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ISD-T360SB Datasheet, PDF (15/109 Pages) List of Unclassifed Manufacturers – VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support

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1âHARDWARE

ISD-T360SB

Manufacturer

Toshiba

Samsung

Table 1-4: Supported Flash Devices

Memory Device

Name

Characteristics

TC58V16BFT

2Mx8

TC5816BFT

2Mx8

TC58A040F

Serial

KM29N040T

512Kx8

Operating

Voltage

3.3 V

KM29W8000T/IT 1Mx8

KM29W16000AT 2Mx8

/AIT

Memory Size Conversion Type

16-Mbit LV

16-Mbit

4-Mbit

8-Mbit

16-Mbit

Âµ-Law

A-Law

Âµ-Law, A-Law

Âµ-Law, A-Law,

ÂµLaw

A-Law

Internal Memory Organization

The Flash devices detailed in Table 1-4 divide in-

ternally into basic 4-Kbyte block units. The ISD-

T360SB uses one block on each device for mem-

ory management, leaving the rest of the blocks

available for recording. Using at least one block

for a single recorded message yields a maximum

of NUM_OF_BLOCKS_IN_MEM â 1 (see Table 2-10

for parameter definition) messages per device.

Upon initialization the ISD-T360SB activates a sift-

ing algorithm to detect defected blocks. De-

fected blocks are defined as blocks with over 10

bad nibbles (a nibble consists of 4 bits). The de-

fected blocks are marked as UNUSED and ex-

cluded from the list of available blocks for

recording.

Toshiba Serial Flash

The VoiceDSP processor supports up to four

TC58A040F, 4Mbit, serial interface, Flash memory

devices for storing messages. The TC58A040F is

organized as an array of 128 blocks, with a ded-

icated, read-only, bad block map programmed

by the manufacturer and located in the last

block. This map is used by the ISD-T360SB to de-

fine the available blocks for recording. The ISD-

T360SB uses the VoiceDSP master MICROWIRE in-

terface to communicate, serially, with the Flash

devices, while selecting the current Flash device

using PB3-PB6. Connecting less than four Flash

devices require connecting the Flash devices se-

quentially, starting from PB3 up to PB6 (see

Figure 1-7). Refer to Figure 1-34for the Master MI-

CROWIRE timing diagram.

ISD

1-7

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