PSB4860HV4.1 Lantiq, PSB4860HV4.1 Datasheet - Page 83

• Manufacturer Part Number: PSB4860HV4.1
• Manufacturer: Lantiq

Specifications of PSB4860HV4.1

• Lead Free Status / Rohs Status: Supplier Unconfirmed

A user data word consists of 12 bits that can be read or written by the user, one bit (R)
that is reserved for future use and three read-only bits (D,M,E) which indicate the status
of a file.
If D is set, the file is marked for deletion and should not be used any more. This bit is
maintained by the for housekeeping. The M bit indicates the file type (audio/binary) while
the E bit indicates an existing file. The E bit may be used after an activation to decide
which files are actually valid and contain data.
2.2.3
This section describes each of the high level memory management commands in detail.
These commands are sufficient for normal operation of an answering machine. In
addition, there are low level commands (section 2.2.4). These commands are only
required for special tasks like in-system reprogramming of the voice prompt area.
Memory Management - Commands
2.2.3.1
This command configures the memory. In case of Flash, the message and the voice
prompt directory are created. It is possible to reserve 4 kB of memory which is
subsequently excluded from the standard file management. This reserved area can then
be used for fast data backup (see emergency mode). The reserved 4kB memory block
is called emergency block.
In case of ARAM/DRAM, only the message directory is created since voice prompts are
assumed to be kept in an additional ROM. The can either create an empty directory from
scratch or leave the first n files of an existing directory untouched while deleting the
remaining files. This option is useful if due to an unexpected event (e.g. power loss
during recording) some data are corrupted. In this case vital system information can still
be recovered if it has been stored in the first files. Furthermore, if bit MV indicates a voice
prompt directory, the voice prompt memory is scanned for a valid directory.
In any case, with the command Initialize the checks the external memory configuration
and delivers the size of usable memory in 1 kByte blocks.
Table 47
Register # of Bits
FCMD
FCMD
FCMD
Data Sheet
15
D
M
5
1
1
High Level Memory Management Commands
Initialize
Initialize Memory Parameters
E
R
Name
CMD
IN
REB
Comment
Initialize command code
Confirmation for Initialization, must be set
Reservation of 4 kB of memory
83
User Definable
PSB 4860
2000-01-14
0