ISD-T360SB Datasheet, PDF (17/109 Pages) List of Unclassifed Manufacturers – VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support

1—HARDWARE
ISD-T360SB
Figure 1-8: Memory Interface with Four 4MB/16 Mbit, NAND Flash Devices (Samsung, Toshiba)
NAND Flash (Samsung, Toshiba)
The VoiceDSP processor supports up to four,
semi-parallel interface, Flash memory devices for
storing messages. Flash device with semi-parallel
interface uses a single 8bit I/O port to set the ad-
dress and access the data. The ISD-T360SB sup-
ports three types of Flash volumes (4Mbit, 8Mbit
and 16Mbit as listed in Table 1-4) while all the
connected Flash devices must be of the same
type. Ports B and C are used to connect ISD-
T360SB to the Flash devices using port B for ad-
dress and data transfer and port C for communi-
cation control and chip select. Connecting less
than four Flash devices require connecting the
Flash devices sequentially, starting from PC4 up
to PC7 (see Figure 1-8). The ISD-T360SB scans the
Flash devices upon initialization, sifting out the
bad blocks, and marking them in a special map,
located in the last block of each device.
ISD
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