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参数资料
| 型号： | 91C94 |
| 厂商： | SMSC Corporation |
| 英文描述： | ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM |
| 中文描述： | 的ISA / PCMCIA的单芯片以太网控制器与RAM |
| 文件页数： | 62/120页 |
| 文件大小： | 447K |
| 代理商： | 91C94 |
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46
I/O SPACE - BANK1
OFFSET
2
NAME
BASE ADDRESS REGISTER
TYPE
READ/WRITE
SYMBOL
BAR
In ISA mode, this register holds the address decode options chosen for the I/O and ROM spaces. It
is part of the EEPROM saved setup and is not usually modified during run-time.
HIGH
BYTE
A15
A14
A13
A9
A8
A7
A6
A5
0
1
0
LOW
BYTE
ROM SIZE
RA18
RA17
RA16
RA15
RA14
0
1
0
1
X
A15 - A13 and A9 - A5 - These bits are
compared in ISA mode against the I/O address
on the bus to determine the IOBASE for
LAN91C94 registers. The 64k I/O space is fully
decoded by the LAN91C94 down to a 16
location
space,
therefore
the
unspecified
address lines A4, A10, A11 and A12 must be all
zeros.
ROM SIZE - Determines the ROM decode area
in ISA mode memory space as follows:
00 = ROM disable
01 = 16k: RA14-18 define ROM select.
10 = 32k: RA15-18 define ROM select.
11 = 64k: RA16-18 define ROM select.
RA18-RA14 - These bits are compared against
the memory address on the bus to determine
if the ROM is being accessed, as a function of
the ROM SIZE. ROM accesses are read only
memory accesses defined by nMEMRD going
low.
For
a
full
decode
of
the
address
space
unspecified upper address lines have to be:
A19 = "1" , A20-A23 lines are not directly
decoded, however ISA systems will only activate
nSMEMRD only when A20-A23=0.
All bits in this register are loaded from the serial
EEPROM.
The I/O base decode defaults to
300h (namely, the high byte defaults to 18h).
ROM SIZE defaults to 01. ROM decode defaults
to CC000 (namely the low byte defaults to 67h).
As an example:
相关PDF资料 |
PDF描述 |
|---|---|
| 92_TNC-50-0-4/111_NE | BOARD TERMINATED, FEMALE, TNC CONNECTOR, SURFACE MOUNT, JACK |
| 92_TNC-50-0-4/111_NM | BOARD TERMINATED, FEMALE, TNC CONNECTOR, SURFACE MOUNT, JACK |
| 92082-314 | 14 CONTACT(S), FEMALE, STRAIGHT TWO PART BOARD CONNECTOR, SURFACE MOUNT |
| 92082-316 | 16 CONTACT(S), FEMALE, STRAIGHT TWO PART BOARD CONNECTOR, SURFACE MOUNT |
| 92082-318 | 18 CONTACT(S), FEMALE, STRAIGHT TWO PART BOARD CONNECTOR, SURFACE MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 91CCC3 | 制造商:Wirepro 功能描述:Connector Accessories Cap and Chain For Receptacle |
| 91-CCC3 | 制造商:CDM ELECTRONIC FORMERLY WPI 功能描述:connector accessory,circular microphone,cap and chain for receptacle |
| 91-CCC-3 | 制造商:Amphenol Corporation 功能描述: 制造商:TE Connectivity 功能描述: |
| 91CR10 | 制造商:TT Electronics / BI Technologies 功能描述:Res Cermet Trimmer 10 Ohm 20% 1/2W 1(Elec)/1(Mech)Turn (9.53 X 9.78 X 7.11mm) Pin Thru-Hole Box |
| 91CR100 | 功能描述:微调电阻 - 通孔 3/8inch 100 Thumbwheel RoHS:否 制造商:Vishay/Sfernice 产品:Trimmer Resistors - Multi Turn 产品类型:Multiturn 转数:14 锥度:Linear 电阻:10 kOhms 电压额定值:250 V 端接类型:Pin 功率额定值:250 mW (1/4 W) 容差:10 % 温度系数:100 PPM / C |
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