cx28500 Mindspeed Technologies, cx28500 Datasheet - Page 136

• Manufacturer Part Number: cx28500
• Description: Cx28500 Multichannel Synchronous Communications Controller
• Manufacturer: Mindspeed Technologies

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7.1.2.2
After PCI configuration is complete, a set of hierarchical configuration sequences must be executed to begin
operation at the channel level.
The Service Request mechanism is the main communication channel between CX28500 and the Host. It is used to
configure CX28500’s registers, read status registers, execute transactions over the EBUS, and activate ports and
channels.
The mechanism is fully described in
7.1.2.3
Global configuration is initiated by the Host issuing service requests. Global configuration specifies information
used across the entire device including all ports, all channels, and the EBUS.
For more information, refer to:
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7.1.2.4
Part of the global configuration involves interrupt queue configuration. For more information, refer to
7.1.2.5
After the global configuration, a specific channel and port configuration must be performed for each supported
channel and port.
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28500-DSH-002-C
Read PCI configuration space (Device Identification, Vendor Identification, Class Code, and Revision
Identification)
Allocate 1 MB system memory range and assign the Base Address register using this memory range
Allow fast back-to-back transactions
Enable PCI system error signal line, SERR*
Allow response for PCI parity error detection
Allow PCI bus-master mode
Allow PCI bus-slave mode
Assign latency
Assign interrupt line routing
Section 6.4
Section 6.5
Table 6-23, RSLP Channel Configuration Register
Table 6-24, RDMA Buffer Allocation Register
Table 6-25, RDMA Channel Configuration Register
Table 6-26, RSIU Time Slot Configuration Descriptor
Table 6-27, RSIU Time Slot Pointer Allocation Register
NOTE:
Service Request Mechanism
Global and EBUS Configuration
Interrupt Queue Configuration
Channel and Port Configuration
Device identification at the PCI Configuration Level must be used to identify the number of
supported ports and channels in CX28500, which in turn affects CX28500’s configuration.
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6.2.1.
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Functional Description
Section
6.3.1.
121