MT92220 Zarlink Semiconductor, MT92220 Datasheet - Page 131

• Manufacturer Part Number: MT92220
• Description: 1023 Channel Voice Over IP/AAL2 Processor
• Manufacturer: Zarlink Semiconductor

Data Sheet
Circular Buffer
Read Pointer
Field
16K bytes:
32K bytes:
64K bytes:
256 bytes:
512 bytes:
1K bytes:
2K bytes:
4K bytes:
8K bytes:
This pointer is used to remember the position of the next byte to be read in the circular
buffer. It thus points to a valid byte. The pointer is defined as a pointer to bytes. When the
read and write pointers are equal, the buffer is deemed empty. This field should be
initialized to zero upon buffer creation. It is control by software and should be updated
each time a packet is read from the circular buffer.
b13
b13
b13
b13
b13
b13
b13
b13
b13
Table 53 - Fields and Description (continued)
RX Circular Buffer Base [20:14]
RX Circular Buffer Base [20:15]
RX Circ Buf Base [20:16]
Figure 69 - RX Circular Buffer Base and Size
RX Circular Buffer Base [20:13]
b12
b12
b12
b12
b12
b12
b12
b12
b12
RX Circular Buffer Base [20:12]
RX Circular Buffer Base [20:11]
b11
b11
b11
b11
b11
b11
b11
b11
b11
RX Circular Buffer Base [20:10]
RX Circular Buffer Base [20:9]
b10
b10
b10
b10
b10
b10
b10
b10
b10
Zarlink Semiconductor Inc.
RX Circular Buffer Base [20:8]
b9
b9
b9
b9
b9
b9
b9
b9
b9
b8
b8
b8
b8
b8
b8
b8
b8
b8
1
b7
b7
b7
b7
b7
b7
b7
b7
b7
1
0
Description
b6
b6
b6
b6
b6
b6
b6
b6
b6
1
0
0
b5
b5
b5
b5
b5
b5
b5
b5
b5
1
0
0
0
b4
b4
b4
b4
b4
b4
b4
b4
b4
1
0
0
0
0
b3
b3
b3
b3
b3
b3
b3
b3
b3
0
0
0
1
0
0
b2
b2
b2
b2
b2
b2
b2
b2
b2
1
0
0
0
0
0
0
b1
b1
b1
b1
b1
b1
b1
b1
b1
1
0
0
0
0
0
0
0
b0
b0
b0
b0
b0
b0
b0
b0
b0
1
0
0
0
0
0
0
0
0
MT92220
131