cx28500 Mindspeed Technologies, cx28500 Datasheet - Page 125

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

6.8.1.1.2
For each channel, the Host allocates the TMDT table. This table is an array which contains up to 4096 entries.
Each entry contains the buffer status descriptor, plus a pointer to the data buffer. Both TMDT and Data Buffer are
allocated in shared memory and initialized by the Host during the driving initialization process.
After channel activation service request, the Buffer Status Descriptor (BSD) is updated by CX28500, after
processing the current buffer.
6.8.1.1.3
Location in Shared memory where data is stored.
6.8.2
6.8.2.1
6.8.2.1.1
This table is allocated and initialized by the Host. This table is an array of 1024 entries (one for each channel) which
contain the message descriptor head pointer address for each logical channel configured in the application. Each
message descriptor head pointer points to the starting address of the receive message descriptor table associated
with the respective channel.
6.8.2.1.2
The Host allocates the RMDT table for each channel. This table is an array which contains up to 4096 entries. Each
entry contains the buffer status descriptor, plus pointer to the data buffer. Both RMDT and Data Buffer are allocated
in shared memory and initialized by the Host during the driving initialization process.
After channel activation service request, the Buffer Status Descriptor (BSD) is updated by CX28500, after
processing the current message.
6.8.2.1.3
Location in shared memory where data is stored.
6.8.3
6.8.3.1
6.8.3.1.1
This register contains the Base Address of the Transmit Head Pointer Table update during the CONFIG_WR SRQ.
6.8.3.1.2
For each channel’s message descriptor (MD) table, CX28500 maintains a pointer to its first MD copied from the
head pointer table and a pointer (actually the offset from the starting address of the current MD being processed).
The length of Transmit Message Descriptor table is given by the fact that the MD is a 12-bit field in Transmit Internal
Message Processing Table (TIMPT).
28500-DSH-002-C
Transmit Message Descriptor Table (TMDT)
Data Buffer
Receive Message Path
Shared Memory
Receive Head Pointer Table (RHPT)
Receive Message Descriptor Table (RMDT)
Data Buffer
Internal Memory
Transmit Path
Transmit Base Address Head Pointer (TBAHP) (CONFIG_WR)
Transmit Internal Message Processing Table (TIMPT)
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Memory Organization
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