28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 83

• Manufacturer Part Number: 28478G-18
• Description: Multichannel Synchronous Communications Controller 208-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of 28478G-18

• Package: 208BGA
• Maximum Data Rate: 32768 Kbps
• Transmission Media Type: Wire
• Power Supply Type: Analog
• Typical Supply Current: 250 mA
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3 V
• Maximum Operating Supply Voltage: 3.6 V

5.0 Memory Organization
MUSYCC interfaces with a system host using a set of data structures located in a shared memory region.
MUSYCC also contains a set of internal registers which the host can configure and which controls MUSYCC. This
section describes the various shared memory data structures and the layout of individual registers which are
required for the operation of MUSYCC.
5.1
Memory Architecture
MUSYCC supports a memory model whereby data is continually moved into and out of a linked list of data buffers
in shared memory for each active channel. This assumes a system topology in which a host and MUSYCC both
have access to shared memory for data control and data flow. The data structures are defined in a way that the
control structures and the data structures may or may not reside in the same physical memory and may or may not
be contiguous. The host allocates and deallocates the required memory space as well as the size and number of
data buffers within that space.
Different versions of MUSYCC support different numbers of channel groups. The host allocates shared memory
regions to configure and control each group.
Figure 5-1
illustrates the memory model used by MUSYCC for control and data structures required for each
supported channel group.
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