參數(shù)資料
型號(hào): AM79C850KCW
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: SUPERNET-R 3
中文描述: 1 CHANNEL(S), 100M bps, FDDI CONTROLLER, PQFP208
封裝: PLASTIC, QFP-208
文件頁(yè)數(shù): 30/97頁(yè)
文件大?。?/td> 358K
代理商: AM79C850KCW
AMD
P R E L I M I N A R Y
30
SUPERNET 3
LSB
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
19574A-4
RECV1(0)
RECV1(1)
RECV1(2)
RECV1(3)
RECV2(0)
RECV2(1)
RECV2(2)
RECV2(3)
RESERVED
ENXMTADSWAP
ENRCVADSWAP
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
Figure 3. Frame Selection Register (FRSELREG)
Options for selecting frame types under two receive
queues operation is as follows:
RECVX3:0
Frame Type
0000
Receive all frames except the frame type
selected for other queue. RECV1[3:0] bits
cannot be programmed as “0000” when
RECV2[3:0] bits are non-zero.
0001
LLC (includes both Sync. & Async. LLC
frames)
0010
SMT
0011
Non-SMT (includes all non-SMT frames
except MAC & Void, MAC & Void frames
are received if Promiscuous mode is
selected in MDREG1)
0100
Implementor
0101
MAC
0110
Sync. LLC
0111
Async. LLC
1000
Void
1001
Async. LLC & SMT
1010–1111
Reserved
The above selection of frames for each queue is made
by programming appropriate bits in the Frame Selection
register (FRSELREG) and is applicable to only those
frames that meet the criteria for copying as defined by
ADDET2–0 bits of Mode Register 1 (MDREG1) of
SUPERNET 3. The following restrictions apply to
frame selection:
1. The same selection is not allowed for both queues.
Programming the Frame Selection register with the
same selection in both the RECVx3:0 bits would
result in SUPERNET 3 operating as a single receive
queue mode, and would default to Receive Queue 1.
This overrides the MENDRCV bit in the Mode
Register 3 (MDREG3).
2. If high level selection option is used for a given frame
type, then sub-level selection for the same frame
type is not allowed [i.e. If LLC (0001) option is
selected for one queue, then Sync. LLC (0110) or
Async. LLC (0111) or Async. LLC & SMT options are
not allowed for the second queue]. If a selection is
made where one frame type is a sub-set of the other
frame type, the selection made for RECV1 queue
supersedes the selection for RECV2 queue.
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