MX98905B Datasheet, PDF (39/86 Pages) List of Unclassifed Manufacturers – The MX98905 is designed for easy implementation of CSMA/CD local area networks,

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.
Bits 7 6 5 4 3 2 1 0
IOB5
IOB6
IOB7
IOB8
AUTY0
AUTY1
AUTY2
AUTY3
IOB8..5 : I/O base bit 8 to bit 5.
AUTY3..0 : States for Auto configuration state
machine.
2.5 AUTOSTATUS REGISTER (R) (ASR)
•
Read port : Base + 0EH/Base + 1EH (I/O/
MEM)
•
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 Æ 22 Æ 34 Æ 46 Æ 59 Æ 6A Æ 0B
When 15 I/O bases are enabled, the following
sequence is available:
18 Æ 22 Æ 34 Æ 46 Æ 59 Æ 6A Æ 7B Æ 8C Æ 9D Æ
AE Æ BF Æ C0 Æ D1 Æ E5 Æ 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.
P/N: PM0365
REV. 1.3, NOV 20 ,1995
39