參數(shù)資料
型號(hào)： AM79C864AKC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： Physical Layer Controller With Scrambler (PLC-S)
中文描述： 0 CHANNEL(S), 100M bps, FDDI CONTROLLER, PQFP120
封裝： PLASTIC, QFP-120
文件頁(yè)數(shù)： 36/51頁(yè)
文件大?。?/td> 271K
代理商： AM79C864AKC
AMD
P R E L I M I N A R Y
3-38
The SUPERNET 2 Family for FDDI 1994 Data Book
continue for T_SCRUB length of time and then enter the
REMOVED state.
PCI Operation for Class S Type Station
For a Class S type station, the PCI Operation is same as
above with one exception. Normally, for a Non-Class S
type station, PCI will be in REMOVED state at reset, but
for a Class S type station, PCI will be in the INSERTED
state. Thus, before entering INSERT_SCRUB or after
leaving REMOVE_SCRUB, rather than putting the
PLC-S in the bypass mode, PHY_INVALID is output on
RX 9–0.
PCI Operation in MAINT State
When the PCM state machine is in the MAINT state, the
PCI state machine does not control the above functions.
In this state all the data paths are under the control of
software. Software controls the data paths via several
control bits in the PLC_CNTRL_A register. Software
can also override the PCI functions when the PCM state
machine is not in the MAINT state by setting the
CONFIG_CNTRL bit in the PLC_CNTRL_B register.
PCI State Machine
The function of the PCI State Machine is described in
Table 14 and Figure 3.
Table 14. PCI State Description
State
Description
PCI0
(REMOVED)
In this state the PCI causes PLC-S to be
bypassed. A transition is made to
INSERT_SCRUB when SET_SC_JOIN
signal is asserted. A transition is made to
INSERTED if CLASS_S or PCM_MAINT
is set.
PCI1
(INSERT SCRUB)
In this state scrubbing is performed.
A transition is made to INSERTED after
T_SCRUB length of time.
PCI2
(REMOVE SCRUB) A transition is made to REMOVED (or to
INSERTED if CLASS_S is set) after
T_SCRUB length of time.
In this state scrubbing is performed.
PCI3
(INSERTED)
In this state scrubbing has completed and
the data paths exists between the PDT/PDR
and the MAC. A transition is made to the
REMOVE_SCRUB state if the START_
SCRUBBING signal is asserted. A transition
is made to the INSERT_SCRUB state if the
SET_SC_JOIN signal is asserted (will only
occur if CLASS_S is set).
Note:
User cannot disable PCI.
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