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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)： | 80/100頁(yè) |
| 文件大?。?/td> | 465K |
| 代理商： | MC68838FCC |
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9- 4
MC68838 USER’S MANUAL
MOTOROLA
9.2 EXTENSIONS TO A AND C BIT HANDLING
The option bit, MAC_MODE_CTL, in control register B and the
TR_BR_FWD input signal
give the MAC extended capabilities for handling the A and C bit fields at the end of
received frames (Table 9-1). These extensions are particularly useful for certain bridging
protocols.
When RABORT2 in control register B is a one, the
ADDR16 output becomes an input,
RABORT2, with the same functionality as the RABORT input.
Table 9-1. MAC A and C Bit Control
Inputs
Outputs
Ax
Cx
Always
Non-Abort
Abort (see Note 1)
Function
A
C
(Frame Copied)
C
(MAC_MODE_CTL = 0,
Frame Flushed)
C
(MAC_MODE_CTL = 1,
Frame Flushed)
End Station
MLA/MSA/ EXT MATCH
Ar = R
Cr = x
Ar = S
Cr = x
EXT_DA_MATCH = 0
(Normal Match Mode)
S
RPT
R
RPT
Bridge Mode
Source Routing MATCH
Ar = R
Cr = x
Ar = S
Cr = x
EXT_DA_MATCH = 1
(Extended Match Mode)
S
RPT
R
RPT
Bridge Mode Promiscuous
Ar = x
Cr = x
EXT_DA_MATCH = 0
(Normal Match Mode)
RPT
Bridge Mode
Transparent_Bridge_Forward
Ar = R
Cr = x
Ar = S
Cr = x
EXT_DA_MATCH = 1
(Extended Match Mode)
RPT
S
RPT
NOTES:
1. Abort is RABORT (TX_RC_CONTROL control register B Bit 3 (ADR_RABR_CTL)=0)
Abort is RABORT (or RABORT2 if TX_RC_CONTROL control register B Bit 3 (ADR_RABR_CTL)=1)
2. S
= Set
Ar
= A Received
R
= Reset
Ax = A Transmitted
RPT = Repeat
Cr = C Received
x
= Don't care
Cx = C Transmitted
3. MAC_MODE_CTL = RC_TX_CONTROL control register B Bit 2
EXT_ DA_MATCH = RC_TX_CONTROL control register B Bit 4
ARCHIVE
INFORMA
TION
ARCHIVE
INFORMA
TION
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