21-10
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
last buffer of a frame contains the total number of frame bytes, including the 2 or 4 bytes
for CRC. Figure 21-5 shows an example of how RxBDs are used in receiving.
Figure 21-5. SCC HDLC Receiving Using RxBDs
Buffer
0
0x0008
32-Bit Buffer Pointer
1
E
F
Receive BD 0
Status
Length
Pointer
0
0x000B
32-Bit Buffer Pointer
0
E
F
Receive BD 1
Status
Length
Pointer
0
0x0003
32-Bit Buffer Pointer
1
E
F
Receive BD 2
Status
Length
Pointer
1
XXXX
32-Bit Buffer Pointer
E
Receive BD 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
8 Bytes
8 Bytes
8 Bytes
8 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
5
Empty
MRBLR = 8 Bytes for this SCC
Empty
Last I-Field Byte
Information
(I-Field) Bytes
Received
Abort was
received after
control byte
0
L
1
L
1
L
F
A
A
C
I
I
I
I
I
I
CR CR F
closing flag
Abort/Idle
F
A
A
C
Legend:
F = Flag
A = Address byte
C = Control byte
I = Information byte
CR = CRC Byte
Summary of Contents for MPC8260 PowerQUICC II
Page 1: ...MPC8260UM D 4 1999 Rev 0 MPC8260 PowerQUICC II UserÕs Manual ª ª ...
Page 66: ...lxvi MPC8260 PowerQUICC II UserÕs Manual MOTOROLA ...
Page 88: ...1 18 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part I Overview ...
Page 120: ...2 32 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part I Overview ...
Page 138: ...Part II iv MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part II Configuration and Reset ...
Page 184: ...4 46 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part II ConÞguration and Reset ...
Page 202: ...Part III vi MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 266: ...8 34 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 382: ...10 106 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 392: ...11 10 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 430: ...Part IV viii MOTOROLA Part IV Communications Processor Module ...
Page 490: ...14 36 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
Page 524: ...17 10 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
Page 556: ...18 32 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
Page 584: ...19 28 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
Page 632: ...21 24 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
Page 652: ...22 20 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
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Page 920: ...31 18 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part IV Communications Processor Module ...
Page 980: ...A 4 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Appendixes ...
Page 1002: ...Index 22 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA INDEX ...
Page 1006: ......