W89C926 Datasheet, PDF (13/48 Pages) Winbond – PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER

W89C926 PENTIC+
Shared Memory Mode Mapping
I/O Mapping
SYSTEM I/O
OFFSET (HA0-4)
NAME
OPERATION
00H
MMA
I/O Write
01H
Word/-Byte
I/O Read
05H
MMB
I/O Write
08H
ID Registers
I/O Read
0FH
10H
LCE Core
Register
1FH
Registers
Read/Write
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. MMA and MMB are used for shared memory mapping control. Since the PENTIC+ decodes only MSA = 0000H to 03FFFH
for shared memory that is, the shared memory base address for the PENTIC+ is 00000H, MMB and bit 0 to 5 of MMA should
be set to 0.
3. Since the PENTIC+ supports 16-bit mode only, the Word/-Byte will be read as 01H.
Buffer Memory Mapping
SYSTEM
OFFSET (HA0-16)
00000H
03FFFH
04000H
07FFFH
MEMORY TYPE
Common/SRAM
Common/(Note)
SHARED MEMORY MODE
Buffer SRAM (16K × 8)
Unused
Notes:
1. This region is occupied by flash memory.
2. The PENTIC+ decodes HA0-16 for memory access. The (common or attribute) MEMBase addresses are left for the host adapter
and the socket service to determine.
Nonvolatile Memory Mapping
F/ EE = 1 (flash memory used)
SYSTEM
OFFSET (HA0-16)
00000H
03FFFH
04000H
1FFFFH
MEMORY TYPE
Attribute/
Flash
Common/
Flash
NAME
CIS/ID/PCMCIA Register
(8K × 8)
(112K × 8)
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Publication Release Date: January 1996
Revision A1