ISD-T360 ETC [List of Unclassifed Manufacturers], ISD-T360 Datasheet - Page 15

• Manufacturer Part Number: ISD-T360
• Description: VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support
• Manufacturer: ETC [List of Unclassifed Manufacturers]

1—HARDWARE
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 – 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.
ISD
Toshiba
Toshiba
Toshiba
Samsung
Samsung
Samsung
Manufacturer
TC58V16BFT
TC5816BFT
TC58A040F
KM29N040T
KM29W8000T/IT
KM29W16000AT
/AIT
Memory Device
Name
Table 1-4: Supported Flash Devices
2Mx8
2Mx8
Serial
512Kx8
1Mx8
2Mx8
Characteristics
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.
3.3 V
5 V
5V
5 V
5 V
5 V
Operating
Voltage
Memory Size Conversion Type
16-Mbit LV
16-Mbit
4-Mbit
4-Mbit
8-Mbit
16-Mbit
µ-Law
A-Law
µ-Law, A-Law
µ-Law, A-Law,
LV
µLaw
A-Law
1-7