參數(shù)資料
型號(hào)： MC68838FCC
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), 125M bps, FDDI CONTROLLER, CQFP120
封裝： CERAMIC, QFP-120
文件頁(yè)數(shù)： 67/100頁(yè)
文件大小： 465K
代理商： MC68838FCC
7-4
MC68838 USER’S MANUAL
MOTOROLA
Table 7-1. RCCTLx and RPATHx Relationship
RCCTL
43 210
RPATH
7654 3210
FUNCTION
<--------------bit
number
x0 000
k000 0000
k =
FILLER. Only START_DATA or FRAME_STATUS can follow this.
0
Between Frames
1
Before FS
00 101
dddd dddd
START_DATA. RPATH contains the frame's FC. Only DATA and END_DATA can follow this.
00 001
dddd dddd
DATA RPATHx. Holds two data symbols. Only DATA and END_DATA can follow this.
x0 F11
F =
crrr DDSS
c =
rrr =
DD =
SS =
END_DATA. RPATHx contains status information describing the frame and why it ended. F is
the flush/retain bit. Only FRAME_STATUS and FILLER can follow this.
0
System interface must keep this frame.
1
System interface should discard this frame if possible.
0
Good CRC: FCS field of frame is valid, regardless of the type of frame.
1
Bad CRC: FCS field of frame is invalid. C = 1 is possible for void or is reserved for
implementor frame types.
Note that the C-bit is only valid if the reason field bits 654 = 000, which means normal
reception completed. In any other case, the CRC indication has no meaning.
111
MAC_Reset: Results from FSM transition R(30a).
110
Format Error: Results from FSM transition R(31b) or R(30b).
101
Fragment: Results from transition FSM R(31a).
100
Invalid Length: Frame ended normally with a T but it is too short or contains an odd
number of symbols. The last odd data symbol is discarded.
011
FSI abort: Frame ended because the FSI or other external logic asserted RABORT
during the reception of a frame.
010
DA Not Matched: MAC believes this frame is not addressed to it. DD = 00
(see below).
001
SA Matched: Frame ended because MAC believes that it sent this frame. Hence,
SS is not zero (see below).
000
Normal: Frame ended normally with a T. The frame could still have a CRC error.
11
Local match and DA <> 0: DA = MLA or MSA or broadcast (if enabled).
10
CAM interface match:
MATCH or TR_BR_FWD is asserted but no local match i.e., not
MLA, MSA or broadcast. For normal, nonextended mode IGNORE_SACAM is false.
01
Promiscuous (if enabled): No local match, received in promiscuous mode.
00
No match: DA is not recognized and frame is not to be received promiscuously,
F = 1 on END_DATA.
11
Local match: SA = MLA or MSA and is not zero. SA could also be matched by the
CAM logic or otherwise satisfy the bridge-stripping algorithm.
10
CAM match and IGNORE_SACAM = 0: CAM finds an SA match but no local match
Note that SA could be zero and also satisfy the bridge-stripping algorithm.
01
Bridge match: CAM does not recognize the SA and no local match, but MAC
determines via the bridge-stripping algorithm (if enabled) that it sent this frame.
00
No match: This station did not send this frame.
xx 100
xxxx xxxx
Reserved for future use. Must be treated as FILLER.
xT F10
T=
nnns ssss
nnn =
sssss =
FRAME_STATUS. RPATHx contains information on the received frame status indicators. (F
is the flush/retain bit described above.) The only time that F here differs from the F-bit on the
preceding END_DATA is when this frame is a secondary NSA frame to be discarded (F = 0 on
END_DATA, F = 1 here).
1
Indicates that this FS can be associated with a previously transmitted frame.
Usually, but not always, F = 1 when T = 1.
FS count field: Number of valid FS indicators present in sssss field.
FS indicator field: This field is filled from bit 4 to bit 0 as FS symbols are received (i.e., bit 4
contains the value of the first FS symbol received). 1 = S-symbol, 0 = R-symbol.
xx 100
xxxx xxxx
Reserved for future use. Must be treated as FILLER.
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