參數(shù)資料
型號: PT7A6632J
廠商: Pericom Semiconductor Corp.
英文描述: PT7A6632 32-Channel HDLC Controller
中文描述: PT7A6632 32通道HDLC控制器
文件頁數(shù): 31/61頁
文件大小: 379K
代理商: PT7A6632J
Data Sheet
PT7A6632 32-Channel HDLC Controller
PT019(05/02)
Ver:2
31
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
i
i+1
i+2
i+3
i+4
i+5
i+6
i+7
Not used
Not used
Not Used by PT7A6632
OVER IVBA ABRT FCER SHER CF/P
CMND
MPTY
(i+7)+1
(i+7)+2
(i+7)+j
(i+7)+k
a. MDFS = 1
~
~
(Address)
Next Buffer
Address
Buffer
Size (k)
msb
lsb
Data
Length (j)
lsb
lsb
msb
Status
First Date Byte
Second Date Byte
Last Date Byte
Last Location in Buffer
~
~
-
D
i
i+1
i+2
i+3
i+4
i+5
i+6
i+7
Not used
Not used
OVER IVBA ABRT FCER SHER CF/P
CMND
MPTY
Not Used by PT7A6632
(i+7)+1
(i+7)+2
(i+7)+j
(i+7)+k
b. MDFS = 0
~
~
(Address)
7 (Contents) 0
Next Buffer
Address
Buffer
Size (k)
msb
lsb
Data
Length (j)
lsb
lsb
msb
Status
First Date Byte
Second Date Byte
Last Date Byte
Last Location in Buffer
~
~
-
D
D
D
7 (Contents) 0
msb
msb
Figure 26. Receive Data Buffer
Receive Data Buffer
The Receive Data Buffer contains 8 bytes of descriptors and j
bytes of user’s data as shown in Figure 26. The MDFS pin
decides the MS byte and LS byte locations (in even and odd
addresses).
Descriptors
The first 8 bytes in the Receive Data Buffer are Descriptors
that specify Next Buffer Address, Buffer Size, Data Length and
Status respectively. See Table 11 for the definition.
Data Bytes
Following the Descriptors are received data. The number of
data bytes are indicated by Data Length which is written by
the PT7A6632 after it receives the last byte of an HDLC frame
or the HDLC ABORT code, upon the loss of multiframe align-
ment error from a non-HDLC signaling channel, or when Re-
ceiver Bit-Level Processor detects receive synchronization
error caused by RSYN, elastic buffer error or RRED. When it is
a partial data buffer, the number of data bytes is indicated by
the Buffer Size.
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