CN8478/CN8474A/CN8472A/CN8471A
5.0 Memory Organization
Multichannel Synchronous Communications Controller (MUSYCC™)
5.2 Descriptors
5.2 Descriptors
This section further details the descriptors specified in the MUSYCC memory
model. The MUSYCC descriptors are as follows:
1. Host Interface Level Descriptors (see Section 5.2.1)
– Global Configuration
– Dual Address Cycle Base Pointer
2. Channel Group Level Descriptors (see Section 5.2.2)
– Group Base Pointer
– Service Request
– Group Configuration
– Memory Protection
– Port Configuration
– Message Length
– Time Slot Map
– Subchannel Map
3. Channel Level Descriptors (see Section 5.2.3)
– Channel Configuration (see Section 5.2.4)
4. Message Level Descriptor
– Head Pointer
– Message Pointer
– Message Descriptor
– Buffer Descriptor
– Buffer Status Descriptor
– Next Message Pointer
– Data Buffer Pointer
– Message Descriptor Handling
5. Interrupt Level Descriptors (see Section 5.2.5)
– Interrupt Queue Descriptor
– Interrupt Descriptor
– Interrupt Status Descriptor
Each of the above entities are allocated, deallocated, read from, and written to
by the host. MUSYCC can read all of these entities as well, but can only write to
these:
•
•
•
Message Pointers
Buffer Status Descriptors
Receive Data Buffers
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Conexant
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