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參數(shù)資料
| 型號： | LAN91C100 |
| 廠商： | SMSC Corporation |
| 英文描述： | FEAST⑩ Fast Ethernet Controller |
| 中文描述： | 宴⑩快速以太網(wǎng)控制器 |
| 文件頁數(shù)： | 29/101頁 |
| 文件大小： | 312K |
| 代理商： | LAN91C100 |
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29
I/O SPACE - BANK 0
OFFSET
A
NAME
MEMORY CONFIGURATION REGISTER
TYPE
Lower Byte -
READ/WRITE
Upper Byte -
READ ONLY
SYMBOL
MCR
HIGH
BYTE
MEMORY SIZE MULTIPLIER
(M)
0
0
1
1
0
1
0
1
LOW
BYTE
MEMORY RESERVED FOR TRANSMIT (IN BYTES * 256 * M)
0
0
0
0
0
0
0
0
MEMORY
Programming this value allows the host CPU to
reserve memory to be used later for transmit,
limiting the amount of memory that receive
packets can use up. When programmed for
zero, the memory allocation between transmit
and receive is completely dynamic. When
programmed for a non-zero value, the allocation
is dynamic if the free memory exceeds the
programmed value, while receive allocation
requests are denied if the free memory is less or
equal to the programmed value. This register
defaults to zero upon reset. It is not affected by
the RESET MMU command.
RESERVED
FOR
TRANSMIT
The value written to the MCR is a reserved
memory
space
IN
MEMORY CURRENTLY IN USE. If the memory
allocated for transmit plus the reserved space
for transmit is required to be constant (rather
than grow with transmit allocations), the CPU
should update the value of this register after
allocating or releasing memory.
ADDITION
TO
ANY
The contents of MIR as well as the low byte of
MCR are specified in 256 * M bytes. The
multiplier M is determined by bits 11, 10, and 9
as follows (Bits 11, 10 and 9 are read only bits
used by the software driver to transparently run
on different controllers of the LAN9000 family):
DEVICE
LAN91C100
LAN91C90
FUTURE
FUTURE
FUTURE
bit 11
0
0
0
1
1
Bit 10
1
0
1
0
0
bit 9
0
1
1
0
1
M
2
1
4
8
16
MAX MEMORY SIZE
256*256*2=128k
256*256*1=64k
256k
512k
1M
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LAN91C110 | FEAST FAST ETHERNET CONTROLLER FOR PCMCIA AND GENERIC 16-BIT APPLICATIONS |
| LAN91C96(100TQFP) | LAN Node Controller |
| LAN91C96(100QFP) | LAN Node Controller |
| LAN91C95 | LAN Node Controller |
| LAN91C100FD(208TQFP) | LAN Node Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LAN91C100FD | 制造商:- 功能描述: 制造商:SMSC 功能描述: |
| LAN91C100-FD | 制造商:SMSC 制造商全稱:SMSC 功能描述:FEAST Fast Ethernet Controller with Full Duplex Capability |
| LAN91C100FD(208PQFP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Node Controller |
| LAN91C100FD(208TQFP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Node Controller |
| LAN91C100FD_06 | 制造商:SMSC 制造商全稱:SMSC 功能描述:FEAST Fast Ethernet Controller with Full Duplex Capability |
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