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MPC8280 Datasheet(PDF) 1272 Page - Freescale Semiconductor, Inc

Part # MPC8280
Description  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 1272 Page - Freescale Semiconductor, Inc

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FCC HDLC Controller
MPC8280 PowerQUICC II Family Reference Manual, Rev. 1
37-10
Freescale Semiconductor
Figure 37-4. FCC HDLC Receiving Using RxBDs
Buffer
0
0x0020
32-Bit Buffer Pointer
1
EF
RxBD 0
Status
Length
Pointer
0
0x0023
32-Bit Buffer Pointer
0
EF
RxBD 1
Status
Length
Pointer
0
0x0003
32-Bit Buffer Pointer
1
EF
RxBD 2
Status
Length
Pointer
1
XXXX
32-Bit Buffer Pointer
E
RxBD 3
Status
Length
Pointer
Address 1
Address 2
Control Byte
Buffer
CRC Byte 1
CRC Byte 2
Buffer
Address 1
Address 2
Buffer
Control Byte
Empty
32 Bytes
32 Bytes
32 Bytes
32 Bytes
Two Frames
Received in HDLC
Unexpected Abort
Stored in Rx Buffer
Line Idle
Occurs before
Present
Time
Time
Stored in Rx Buffer
Buffer Full
Buffer Closed
When Closing Flag
Buffer
Still Empty
1
AB
29
Empty
MRBLR = 32 Bytes for this FCC
Empty
Last I-Field Byte
Information
(I-Field) Bytes
Received
Abort was
Received after
Control Byte
0
L
1
L
1
L
FA
A
C
I
I
I CR CR F
Closing Flag
Abort/Idle
FAA
C
Legend:
F = Flag
A = Address Byte
C = Control Byte
I = Information Byte
CR = CRC Byte
. . .



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