w89c926 Winbond Electronics Corp America, w89c926 Datasheet - Page 13

• Manufacturer Part Number: w89c926
• Description: Pcmcia Ethernet Network Twisted Pair Interface Controller
• Manufacturer: Winbond Electronics Corp America

Shared Memory Mode Mapping
I/O Mapping
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
2. MMA and MMB are used for shared memory mapping control. Since the PENTIC+ decodes only MSA = 0000H to 03FFFH
3. Since the PENTIC+ supports 16-bit mode only, the Word/-Byte will be read as 01H.
Buffer Memory Mapping
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)
to determine.
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.
OFFSET (HA0-16)
OFFSET (HA0-16)
OFFSET (HA0-4)
SYSTEM I/O
SYSTEM
SYSTEM
03FFFH
07FFFH
03FFFH
1FFFFH
00000H
04000H
00000H
04000H
0FH
1FH
00H
01H
05H
08H
10H
MEMORY TYPE
MEMORY TYPE
Common/SRAM
Common/(Note)
ID Registers
Word/-Byte
LCE Core
Common/
Registers
Attribute/
NAME
Flash
Flash
MMA
MMB
- 13 -
Publication Release Date: January 1996
W89C926 PENTIC+
SHARED MEMORY MODE
CIS/ID/PCMCIA Register
Buffer SRAM (16K
OPERATION
Read/Write
(112K
I/O Write
I/O Read
I/O Write
I/O Read
(8K
Register
Unused
NAME
8)
8)
Revision A1
8)