參數(shù)資料
型號(hào)： MX98905B
廠商： Macronix International Co., Ltd.
英文描述： IEEE 802.3, 10BASE5, 10BASE2 Controller and Integrated Bus Interface(IEEE 802.3, 10BASE5, 10BASE2控制器和集成總線接口)
中文描述： IEEE 802.3標(biāo)準(zhǔn)，10BASE5，10Base2的控制器和集成總線接口（IEEE 802.3標(biāo)準(zhǔn)，10BASE5，10Base2的控制器和集成總線接口）
文件頁(yè)數(shù)： 15/86頁(yè)
文件大小： 352K
代理商： MX98905B
15
P/N: PM0365
REV. 1.3, NOV 20 ,1995
MX98905B
3. SHARED MEMORY NON-COMPATIBLE MODE
The difference between compatible and non-
compatible mode is that the non-compatible mode
maps a full 64 kbytes of RAM into the PC's memory
address space instead of 8 kbytes. The I/O map for
both modes is the same.
4. 16-BIT I/O PORT COMPATIBLE MODE
This mode is compatible with the Novel NE2000. I/O
address mapping and Memory mapping will be shown
in the following subsection.
After I/O base is determined, the following structure
appears:
4.1 I/O Address Mapping
FIGURE 6. I/O MODE I/O PORT MAP
BASE + 00H
BASE + 0FH
BASE + 10H
BASE + 17H
BASE + 18H
BASE + 1FH
MX9890
CORE
REGISTERS
D15
D0
DATA TRANSFER PORT
RESET PORT
4.2 Memory Address Mapping
FIGURE 7. I/O MODE MEMORY MAP
The registers within this area are 8 bits wide, but the
data transfer port is 16 bits wide. By programming the
ENC's internal registers, the user can issue Remote
DMA to transfer data between the data port and the
external memory.
0000H
001FH
4000H
7FFFH
8000H
C000H
FFFFH
PROM
D15
D0
ALIASED
PROM
8Kx16
BUFFER RAM
ALIASED
PROM
ALIASED
BUFFER RAM
The MX98905 Controller has a 64K address range, but
only does partial decoding on these devices. The
PROM data is mirrored at all decodes up to 4000H and
the entire map is repeated at 8000H. In order to access
either the PROM or the RAM, the user must initiate a
Remote DMA transfer between the I/O port (see I/O
map) and the memory.
Address 00H to 1FH are specified as the PROM space
to make the MX98905 compatible with NE2000. Simi-
lar to shared memory map, this is actually an array of
8-bit registers which are loaded from EEPROM during
power-on reset. User should prepare data in the
EEPROM as show in the format.
For user's convenience, the MX98905 provides an
enhanced mode to facilitate software to access the
contents of ID PROM -- Read ID PROM through I/O
port. User can refer to Enhanced mode description for
details.
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