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參數(shù)資料
| 型號： | LAN91C100FD |
| 廠商： | SMSC Corporation |
| 英文描述： | FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY |
| 中文描述： | 宴快速以太網(wǎng)控制器以全雙工能力 |
| 文件頁數(shù)： | 22/79頁 |
| 文件大小： | 585K |
| 代理商： | LAN91C100FD |
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FEAST Fast Ethernet Controller with Full Duplex Capability
Rev.
10/14/2002
Page 22
SMSC DS – LAN91C100FD Rev. D
PRELIMINARY
The default bit values upon hard reset are highlighted below each register.
Table 5.1 - Internal I/O Space Mapping
BANK0
TCR
EPH STATUS
BANK1
CONFIG
BASE
BANK2
BANK3
MT0-1
MT2-3
0
2
MMU COMMAND
PNR
ARR
FIFO PORTS
POINTER
DATA
DATA
INTERRUPT
BANK SELECT
4
6
8
A
C
E
RCR
IA0-1
IA2-3
IA4-5
MT4-5
MT6-7
MGMT
REVISION
ERCV
BANK SELECT
COUNTER
MIR
MCR
RESERVED (0)
BANK SELECT
GENERAL PURPOSE
CONTROL
BANK SELECT
A special BANK (BANK7) exists to support the addition of external registers.
BANK SELECT REGISTER
OFFSET
E
NAME
TYPE
SYMBOL
BSR
BANK SELECT
REGISTER
0
READ/WRITE
HIGH
BYTE
LOW
BYTE
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
BS2
BS1
BS0
X
X
X
X
X
0
0
0
BS2, BS1, BS0 Determine the bank presently in use. This register is always accessible and is used to
select the register bank in use.
The upper byte always reads as 33h and can be used to help determine the I/O location of the
LAN91C100FD.
The BANK SELECT REGISTER is always accessible regardless of the value of BS0-2.
Note
:
The bank select register can be accessed as a doubleword at offset Ch, as a word at offset Eh, or
as at offset Fh, however a doubleword write to offset Ch will write the BANK SELECT REGISTER
but will not write the registers Ch and Dh.
BANK 7 has no internal registers other than the BANK SELECT REGISTER itself. On valid cycles where
BANK7 is selected (BS0=BS1=BS2=1), and A3=0, nCSOUT is activated to facilitate implementation of
external registers.
Note
:
BANK7 does not exist in LAN91C9x devices. For backward S/W compatibility BANK7 accesses should be
done if the Revision Control register indicates the device is the LAN91C100FD.
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