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| 型號： | MX98905BFC |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | The MX98905 is designed for easy implementation of CSMA/CD local area networks, |
| 中文描述： | 該MX98905是專為易于實現(xiàn)的多址/光盤局域網(wǎng)， |
| 文件頁數(shù)： | 39/86頁 |
| 文件大?。?/td> | 352K |
| 代理商： | MX98905BFC |
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39
P/N: PM0365
REV. 1.3, NOV 20 ,1995
MX98905B
2.3 SIGNATURE FOR MULTI_BOARD AUTO CON-
FIGURATION (R) (SGN)
This register is only used in multi_LAN card auto
configuration. It is readable only when the LSB of
Network ID programmed by user is matched with the
contents of ID5 of PROM.
Read port : Base + 08H/Base + 18H (I/O/ MEM)
Read condition
NPGEN = 1
PGSEL = 1
The value of signature is 78H (ASCII code for 'x')
Note :
Lock status will be reset after user has read the
value of signature. User should exactly follow the
algorithm provided in enhanced feature description for
Multi_board Lan Card auto configuration. For user's
convenience, we strongly recommend that he issues
EESTORE after auto configuration is done.
2.5 AUTOSTATUS REGISTER (R) (ASR)
MEM)
Read port : Base + 0EH/Base + 1EH (I/O/
Read condition :
NPGEN = 1
PGSEL = 1
When 7 I/O bases are selected, the following value
sequence will be shown on ASR whenever AUTO of
HCMR is written into:
18
22
34
46
59
6A
0B
When 15 I/O bases are enabled, the following
sequence is available:
18
22
34
46
59
6A
7B
8C
9D
AE
BF
C0
D1
E5
07
i.e., when AUTO is first written, the contents of ASR
are 18H; if user writes AUTO again, the value of ASR
changes from 18H to 22H, etc. This feature can be
used in auto configuration to determine whether the I/
O base of the LAN card is in conflict with the others.
IOB5
IOB6
IOB7
IOB8
AUTY0
AUTY1
AUTY2
AUTY3
0
1
2
3
4
5
6
7
Bits
IOB8..5 : I/O base bit 8 to bit 5.
AUTY3..0 : States for Auto configuration state
machine.
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