CN8478 Datasheet, PDF (139/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

CN8478/CN8474A/CN8472A/CN8471A
Multichannel Synchronous Communications Controller (MUSYCC™)
6.0 Basic Operation
6.2 Configuration
6.2.2 Global Configuration
After PCI configuration is complete, a set of hierarchical configuration sequences
must be executed to begin operation at the channel level. Global configuration is
initiated by the host either issuing a service request or performing slave writes
into MUSYCC resident Global Configuration Descriptor.
Global configuration specifies information used across the entire device
including all supported channel groups, all channels, and the EBUS (see
Table 5-6, Global Configuration Descriptor).
NOTE: Device identification at the PCI Level Configuration must be used to
identify the number of supported channel groups and channels in
MUSYCC, which, in turn, affects how MUSYCC is eventually configured.
6.2.3 Interrupt Queue Configuration
Part of global configuration involves interrupt queue configuration (see
Table 5-28, Interrupt Queue Descriptor).
6.2.4 Channel Group(s) Configuration
After global configuration, more specific group configuration must be performed
for each supported channel group.
The relevant references are as follows:
• Table 5-10, Group Configuration Descriptor
• Table 5-11, Memory Protection Descriptor
• Table 5-12, Port Configuration Descriptor
• Table 5-13, Message Length Descriptor
• Table 5-14, Transmit or Receive Time Slot Map
• Table 5-16, Transmit or Receive Subchannel Map
• Table 5-18, Channel Configuration Descriptor
6.2.5 Service Request Mechanism
The service request mechanism requires that the host perform a direct memory
write operation (slave write) into the appropriate channel group’s Service Request
Descriptor that is within MUSYCC’s internal registers.
The relevant references are as follows:
• Table 5-1, MUSYCC Register Map
• Table 5-9, Service Request Descriptor
100660E
Conexant
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