20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 194

• Manufacturer Part Number: 20-668-0024
• Description: IC CPU RABBIT4000 128-LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0024

• Processor Type: Rabbit 4000 8-bit
• Speed: 60MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: 20-668-0022; 316-1078

19.3.5.4 Circular Queue
A circular queue is a buffer array or linked list where the final buffer is linked back to the
first buffer in the sequence. This method allows for continuous reception of transfers with-
out having to reload the initial address for the DMA buffer descriptor sequence.
The “ping-pong buffer,” where there are only two buffers, is the simplest version of a
circular queue. The application can operate on one buffer while the other buffer is being
loaded.
19.3.5.5 Linked Array
The linked array is simply a linked list of buffer arrays, where the last buffer in each array
is linked to the first buffer in the next array (which can be located anywhere in memory).
This method could be useful where a message is broken down into separate transfers, but
entire messages could be scattered/gathered from anywhere in memory.
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Rabbit 4000 Microprocessor User’s Manual