參數(shù)資料
型號(hào)： 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(yè)數(shù)： 24/61頁(yè)
文件大?。?/td> 379K
代理商： PT7A6632J
Data Sheet
PT7A6632 32-Channel HDLC Controller
PT019(05/02)
Ver:2
24
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
i
i+1
i+2
i+3
i+4
i+5
i+6
i+7
Not used
FC
FO
Not used
Not Used by PT7A6632
UNDR IVBA
Not used
CF/P
CMND
MPTY
(i+7)+1
(i+7)+2
(i+7)+j
(i+7)+j+1
(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
Flag Count (Optional)
Last Location in Buffer
~
~
D
i
i+1
i+2
i+3
i+4
i+5
i+6
i+7
Not used
FC
FO
Not used
UNDR IVBA
Not used
CF/P
CMND
MPTY
Not Used by PT7A6632
(i+7)+1
(i+7)+2
(i+7)+j
(i+7)+j+1
(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
Flag Count (Optional)
Last Location in Buffer
~
~
-
D
D
D
7 (Contents) 0
msb
msb
Figure 23. Transmit Data Buffer
Data Processing Memory
General
The Data Processing Memory refers to Data or Command buff-
ers which are linked each other. The PT7A6632 accesses the
Data Processing Memory for transmit/receive data and opera-
tion commands. Each buffer has following configuration (see
Figure 22):
8-Byte Descriptors
Data bytes to be transmitted or received or Command
There are 4 kinds of buffers, Transmit Data Buffer and Trans-
mit Command Buffer for transmit channels, and Receive Data
Buffer and Receive Command Buffer for receive channels.
Transmit Data Buffer
The Transmit Data Buffer contains 8 bytes of descriptors and j
bytes of user’s data as shown in Figure 23. The MDFS pin
decides the most significant byte and least significant byte
locations (in even and odd addresses).
Descriptors
The first 8 bytes in the transmit Data Buffer is Descriptors that
specifies Next Buffer Address, Buffer Size, Data Length and
Status respectively. See Table 6 for the definition.
Data Bytes
Following the Descriptors are the data to be transmitted. The
number of bytes are specified by Data Length (for complete
data buffer) or Buffer Size (for partial data buffer). The buffer
may contains last byte of a frame (CF/P = 1) or partial data of a
frame (CF/P = 0) in HDLC mode. The CF/P should be reset for
other modes.
Flag Count Byte (Optional)
Specifies the additional flags to be added after “CRC + one
Flag” of a frame. It will be read only when Flag Control bit in
the MS byte of Data Length is set (FC = 1).
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