28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 89

• 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

Further, the host may choose to allocate all the memory contiguously, or it may allocate the memory for message
descriptors separately from data buffers. In this case, message descriptors for 8 Channel Groups may be merged
into a contiguous block of memory [(1800h x 8 = C000h) bytes in length].
5.2
This section further details the descriptors specified in the MUSYCC memory model. The MUSYCC descriptors are
as follows:
1. Host Interface Level Descriptors (see
2. Channel Group Level Descriptors (see
3. Channel Level Descriptors (see
4. Message Level Descriptor
28478-DSH-002-E
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Memory for Data Buffers =
32 channels/group *
2 directions/channel *
8 buffers/channel *
256 bytes/buffer
= 131, 072 bytes/group
= 20,000h bytes/group
Global Configuration
Dual Address Cycle Base Pointer
Group Base Pointer
Service Request
Group Configuration
Memory Protection
Port Configuration
Message Length
Time Slot Map
Subchannel Map
Channel Configuration (see
Head Pointer
Message Pointer
Message Descriptor
Buffer Descriptor
Buffer Status Descriptor
Next Message Pointer
Data Buffer Pointer
Message Descriptor Handling
Descriptors
Preliminary Information / Mindspeed Proprietary and Confidential
Section
Section
Mindspeed Technologies
Section
Section
5.2.3)
5.2.4)
5.2.1)
5.2.2)
®
Memory Organization
76