W89C926 Datasheet, PDF (11/48 Pages) Winbond – PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER

W89C926 PENTIC+
EECS/FCS Pull Low (EEPROM)
ATTRIBUTE MEMORY
OFFSET (HA0-16)
TYPE
CONTENTS
00000H
Memory (SRAM)
CIS
003D6H
-
Unsued
-
00FD0H
Register
COR
00FD2H
Register
CCSR
00FD4H
Register
-
00FD6H
Register
SCR
-
Register
Reserved (see note)
00FF0H
Register
CFA
00FF2H
Register
CFB
00FF4H
Register
SR
00FF6H
00FFEH
Register
Reserved
01000H
Unused
-
03FFEH
Notes:
1.The reserved register space in the attribute space is left for future extension. Users should not place their application in this
area.
2. When EECS/ FCS is pulled high, address 00FA0H to 00FFEH is used for Ethernet ID, configuration, and registers.
Vendors should not put CIS in this region.
3. When EECS/ FCS is pulled low, Address 00000H to 003D6H is read-only. The PENTIC+ will ignore write accesses to this
area.
NE2000 Mode Mapping
I/O Mapping
SYSTEM I/O
OFFSET (HA0-4)
NAME
OPERATION
00H
LCE Core
Register
0FH
Registers
Read/Write
10H
Remote DMA Port
Remote DMA
17H
Read/Write
18H
Reset Port
Software Reset
1FH
Notes:
1. The PENTIC+ decodes only HA0-4 for I/O access, so the IOBase address is left for the host adapter and the socket service
to determine.
2. To issue a S/W reset, simply issue an I/O read to the Reset Port. The PENTIC+ will assert a 600 nS internal reset pulse to
reset the core state machine. If the host tries to access the PENTIC+, WAIT will be asserted low until the reset is
completed.
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Publication Release Date: January 1996
Revision A1