參數(shù)資料
型號: Am79C965A
廠商: Advanced Micro Devices, Inc.
英文描述: PCnet?-32 Single-Chip 32-Bit Ethernet Controller
中文描述: PCnet?-32單芯片32位以太網(wǎng)控制器
文件頁數(shù): 112/228頁
文件大?。?/td> 1681K
代理商: AM79C965A
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁當(dāng)前第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁
112
Am79C965A
Table 37. Slave Accesses
Data =
indicates the position of the active bytes.
Copy =
indicates the positions of copies of the active
bytes.
Undef =
indicates byte locations that are undefined
during the transfer.
EEPROM Microwire Access
The PCnet-32 controller contains a built-in capability
for reading and writing to an external EEPROM. This
built-in capability consists of a microwire interface for
direct connection to a microwire compatible EEPROM,
an automatic EEPROM read feature, and a user-
programmable register that allows direct access to the
microwire interface pins.
Automatic EEPROM Read Operation
Shortly after the de-assertion of the RESET pin, the
PCnet-32 controller will read the contents of the
EEPROM that is attached to the microwire
interface.The automatic EEPROM read begins with
EECS being asserted approximately 2.5 EESK periods
following the de-assertion of the RESET pin.
Because of this automatic-read capability of the
PCnet-32 controller, an EEPROM can be used to
program many of the features of the PCnet-32
controller at power-up, allowing system-dependent
configuration information to be stored in the hardware,
instead of inside of operating code. PCnet-32 controller
interrupt pins will be floated during H_RESET and will
remain floated until either the EEPROM has been
successfully read, or, following an EEPROM read
failure, a Software Relocatable Mode sequence has
been successfully executed.
If an EEPROM exists on the microwire interface, the
PCnet-32 controller will read the EEPROM contents at
the end of the H_RESET operation. The EEPROM
contents will be serially shifted into a temporary
register and then sent to various register locations on
board the PCnet-32 controller. System bus interaction
will not occur during the EEPROM read operation after
H_RESET, since H_RESET will put the PCnet-32
controller into a state that will not recognize any I/O
accesses and the PCnet-32 controller will not yet be at
an operating point that requires it to request the bus for
bus mastering.
Thirty-four bytes of the EEPROM are set aside for
PCnet-32 configuration programming and 2 bytes of
the EEPROM are set aside for user programming of
logic that is external to the PCnet-32 controller and may
or may not be pertinent to the operation of the
PCnet-32 controller within the system. The user may
gain access to the EEPROM data by snooping the
PCnet-32 controller automatic read operation. Logic
may be attached to the EEPROM interface to snoop the
entire EEPROM read operation using the microwire
signals directly, or a simpler scheme may be invoked by
taking advantage of an additional signal provided by
the PCnet-32 controller (i.e. the SHFBUSY signal).
A checksum verification is performed on the data that
is read from the EEPROM. If the checksum verification
R/W
BE3
BE0
D31
D24
D23
D16
D15
D8
D7
D0
Comments
RD
0000
Data
Data
Data
Data
Double word access to double word address, e.g.
300, 30C, 310 (DWIO mode only)
RD
1100
Undef
Undef
Data
Data
WIO Mode Only:
Word access to even
word address, e.g. 300, 30C, 310
RD
0011
Data
Data
Copy
Copy
WIO Mode Only:
Word access to odd
word address, e.g. 302, 30E, 312
RD
1110
Undef
Undef
Undef
Data
WIO Mode APROM Read Only:
Byte access to
lower byte of even word address, e.g. 300, 304
RD
1101
Undef
Undef
Data
Undef
WIO Mode APROM Read Only:
Byte access to
upper byte of even word address, e.g. 301, 305
RD
1011
Undef
Data
Undef
Copy
WIO Mode APROM Read Only:
Byte access to
lower byte of odd word address, e.g. 302, 306
RD
0111
Data
Undef
Copy
Undef
WIO Mode APROM Read Only:
Byte access to
upper byte of odd word address, e.g. 303, 307
WR
0000
Data
Data
Data
Data
Double word access to double word address, e.g.
300, 30C, 310 (DWIO mode only)
WR
1100
Undef
Undef
Data
Data
WIO Mode Only:
Word access to even word
address, e.g. 300, 30C, 310
WR
0011
Data
Data
Undef
Undef
WIO Mode Only:
Word access to odd word
address, e.g. 302, 30E, 312
( )
相關(guān)PDF資料
PDF描述
AM79C970AKCW PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AKC PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970A PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AVCW PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970 PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C965AWW WAF 制造商:Advanced Micro Devices 功能描述:
AM79C970 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
AM79C970A 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AKC 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product