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參數(shù)資料
| 型號(hào)： | PP155 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 12/31頁(yè) |
| 文件大?。?/td> | 600K |
| 代理商： | PP155 |
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12
Altera Corporation
Specifications
PPP Packet Processor 155 Mbps MegaCore Function (PP155) User Guide
Receiver Description
The PP155 receives data from the Midbus interface and forwards it to the
RXHLDC block for processing.
RXHDLC
The RXHDLC block processes the data in the incoming PPP packet. The
following descriptions explain the principle functions of the RXHLDC
block.
Byte Alignment
Byte alignment aligns the boundaries of the PPP bytes (flags, CRC, etc.)
with the boundaries of the packet processor. This function is necessary if
the transmission facility does not preserve byte boundaries. If the byte
boundaries are preserved (as in SONET), this function should be disabled.
Assume the following packet:
If the data becomes misaligned by 2 bits, the bytes on the Midbus are as
follows:
Clock Cycle
Contents
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
1
2
3
4
5
6
7
8
flag
flag
data
data
FCS
FCS
flag
flag
0
0
a
i
c
c
0
0
1
1
b
j
c
c
1
1
1
1
c
k
c
c
1
1
1
1
d
l
c
c
1
1
1
1
e
m
c
c
1
1
1
1
f
n
c
c
1
1
1
1
g
o
c
c
1
1
0
0
h
p
c
c
0
0
Clock Cycle
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
1
2
3
4
5
6
7
8
9
x
1
1
g
o
c
c
1
1
x
0
0
h
p
c
c
0
0
0
0
a
i
c
c
0
0
x
1
1
b
j
c
c
1
1
x
1
1
c
k
c
c
1
1
x
1
1
d
l
c
c
1
1
x
1
1
e
m
c
c
1
1
x
1
1
f
n
c
c
1
1
x
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