PT7A6632 Datasheet, PDF (23/61 Pages) Pericom Semiconductor Corporation – PT7A6632 32-Channel HDLC Controller

Data Sheet
PT7A6632 32-Channel HDLC Controller
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Figure 22. Organization and Linking of Data or Command Buffers
Address 7
Buffer 1
0
i
i+7
i+7+1
Next Buffer Start Address
Buffer Size
Data length
Status byte
8 Bytes of Buffer Descriptor*
~~
k Bytes of User s Data
or
~~
Data or
Command
2 Bytes of Channel Mode
& Rate Definition Data
i+7+k
7
Buffer 2
0
m
m+7
m+7+1
~~
m+7+n
Next Buffer Start Address
Buffer Size
Data length
Status byte
n Bytes of User s Data
~~
or
2 Bytes of Channel Mode
& Rate Definition Data
8 Bytes of Buffer Descriptor*
Data or
Command
PT019(05/02)
7
Buffer N
0
p
Next Buffer Start Address
Buffer Size
Data length
Status byte
p+7
p+7+1
~~
r Bytes of User s Data
~~
or
2 Bytes of Channel Mode
p+7+r
& Rate Definition Data
8 Bytes of Buffer Descriptor*
Data or
Command
* Formats are different for Data buffer and Command buffer, and differs with MDFS
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