PSB4860HV4.1 Lantiq, PSB4860HV4.1 Datasheet - Page 79

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

Specifications of PSB4860HV4.1

• Lead Free Status / Rohs Status: Supplier Unconfirmed

2.2
Memory Management
Memory Management - General
This section describes the memory management provided by the . As figure 42 shows,
three units can access the external memory. During recording, the speech coder can
write compressed speech data into the external memory. For playback, the speech
decoder reads compressed speech data from external memory. In addition, the
microcontroller can directly access the memory by the SCI interface.
Figure 42 Memory Management - Data Flow
The memory is organized as a file system. The offers one directory for messages and
one for voice prompts. These two directory have a similar structure. Figure 43 illustrates
the basic structure of the message directory.
Figure 43 Memory Management - Structure of Message Directory
The message directory contains 255 file descriptors, each describing one file. See the
next section for details on files.
Data Sheet
directory
Memory Management
SCI
file descriptor 255
file descriptor 1
file descriptor n
Speech Decoder
Speech Coder
Memory
79
file descriptor (R/W)
user data (16 bits)
length (0-65535)
RTC1 (16 bits)
RTC2 (16 bits)
PSB 4860
2000-01-14