參數(shù)資料
型號： AM79C976
廠商： Advanced Micro Devices, Inc.
英文描述： PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
中文描述： PCnet -專業(yè)⑩個10/100Mbps PCI以太網(wǎng)控制器
文件頁數(shù)： 96/309頁
文件大?。?/td> 2070K
代理商： AM79C976
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頁當(dāng)前第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頁第229頁第230頁第231頁第232頁第233頁第234頁第235頁第236頁第237頁第238頁第239頁第240頁第241頁第242頁第243頁第244頁第245頁第246頁第247頁第248頁第249頁第250頁第251頁第252頁第253頁第254頁第255頁第256頁第257頁第258頁第259頁第260頁第261頁第262頁第263頁第264頁第265頁第266頁第267頁第268頁第269頁第270頁第271頁第272頁第273頁第274頁第275頁第276頁第277頁第278頁第279頁第280頁第281頁第282頁第283頁第284頁第285頁第286頁第287頁第288頁第289頁第290頁第291頁第292頁第293頁第294頁第295頁第296頁第297頁第298頁第299頁第300頁第301頁第302頁第303頁第304頁第305頁第306頁第307頁第308頁第309頁
96
Am79C976
8/01/00
P R E L I M I N A R Y
tests on the external SRAM, internal SRAM access
logic, and the PC board interconnect.
The MBIST controller can determine the size of the ex-
ternal SRAM and verify its operation using the following
procedure:
1. Program SRAM_SIZE to the minimum allowed
value of 4.
2. Write DM_START and DM_FAIL_STOP (write
DATAMBIST bits 63:56 with 0x28). The remainder
of the DATAMBIST register ignores writes so it may
be written with arbitrary data or not written at all.
3. Read DM_DONE (DATAMBIST bit 63) and
DM_ERROR (DATAMBIST bit 62) until DM_DONE
is set.
4. If DM_ERROR is set, the memory is defective; re-
port the error and exit.
5. Program SRAM_SIZE to the maximum value of
0x8000 and repeat steps 2 and 3.
6. If DM_ERROR is zero, report the current value of
SRAM_SIZE as the SSRAM size.
7. If DM_ERROR is set, program SRAM_SIZE to one-
half the maximum (0x4000) and repeat steps 2
and 3.
8. Repeat, using the binary search algorithm, until the
SRAM size has been determined.
EEPROM Interface
The Am79C976 device includes an interface to an op-
tional 16-bit word-oriented 93Cxx-compatible serial
EEPROM that supports automatic address increment-
ing (sequential read). This EEPROM can be used for
storing initial values for Am79C976 registers. The con-
tents of this EEPROM are automatically loaded into the
selected registers after a reset operation or whenever
the host CPU requests an EEROM read operation.
Note that if the EEPROM is not included in the system,
the MAC address (and Magic Packet information, if
needed) must be initialized by the host CPU.
The Am79C976 device automatically detects the size
of the EEPROM. When the EEPROM decodes a read
command, it drives its DO pin low when the A0 address
bit is written to the DI pin. The Am79C976 device uses
this fact to detect the number of bits in the EEPROM
address and from this determines the EEPROM size.
Data in the EEPROM are interpreted as three-byte
entries that contain register address and register data
so that the system designer can choose which regis-
ters will automatically be loaded. In a typical system,
the EEPROM would be used to initialize the device
’
s
IEEE 802 physical address, the PCI Subsystem Vendor
ID, LED configuration, SSRAM configuration, and other
hardware configuration information. For compatibility
with older PCnet family software the Address PROM
Space should be loaded from the EEPROM. See the
Address PROM Space
section for details.
Only the memory-mapped registers can be loaded
from the EEPROM. While the CSRs and BCRs are not
memory-mapped, all useful bits in the CSRs and BCRs
are aliased into memory-mapped registers so that all
useful bits can be loaded from the EEPROM.
Most of the memory-mapped registers are 32 bits wide
and occupy 4 bytes of memory space each. For exam-
ple, the CMD2 Register is located at offset 50h from the
memory base address. Its least significant 16 bits can
be accessed at offset 50h, and its most significant 16
bits can be accessed at offset 52h. Register data are
loaded from the EEPROM 16 bits at a time, so that the
high order bits of a register are loaded independently
from the low order bits.
The EEPROM Access Register gives the host CPU di-
rect access to the interface pins so that it can read from
or write to the EEPROM.
!(%%0#'
After the trailing edge of the RESET signal or after the
PREAD bit in BCR19 is set, the Am79C976 device be-
gins to read data from the EEPROM. Data from the EE-
PROM are interpreted as a string of 3-byte entries.
Each entry contains a 1-byte register address and a
2-byte register data field. The register address field
contains the offset of the target register divided by 2.
The initialization logic writes the contents of the register
data field into the register selected by the register ad-
dress byte.
Since EEPROM data are loaded two bytes at a time,
the least significant bit of the target register offset is
omitted from the address field. Only bits 8:1 are in-
cluded. Therefore, the register address byte contains
the offset of the target register divided by two. For ex-
ample, the Control2 Register (CTRL2) is a 32-bit regis-
ter located at offset 70h (relative to the contents of the
Memory-Mapped I/O Base Address Register). There-
fore, the byte stream 38h, 02h, 05h would cause the
value 0205h to be loaded into bits [15:0] of CTRL2, and
39h, 00h, 03h would cause the value 0003h to be
loaded into bits [31:16] of the same register.
If the value of the address byte is 0FFh, the following
2-byte field is interpreted as a 16-bit CRC code rather
than as register data. The CRC code covers all
EEPROM data up to and including the address byte of
the entry containing the CRC. All EEPROM data after
the CRC code word are ignored.
The CRC code used is CRC-16, which is based on the
generator polynomial x
16
+ x
15
+ x
2
+ 1.
The EEPROM must contain data for an odd number of
registers so that the CRC is aligned on a 16-bit word
相關(guān)PDF資料
PDF描述
AM79C976KIW PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C976KCW PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C978AKCW Single-Chip 1/10 Mbps PCI Home Networking Controller
AM79C978AVCW Single-Chip 1/10 Mbps PCI Home Networking Controller
AM79C978 Single-Chip 1/10 Mbps PCI Home Networking Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C976KC 制造商:Rochester Electronics LLC 功能描述:METRIC PLASTIC QUAD-RING - Bulk
AM79C976KCW 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C976KD 制造商:Advanced Micro Devices 功能描述:ETHERNET:MEDIA ACCESS CONTROLLER (MAC)
AM79C976KF 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP 制造商:AMD (Advanced Micro Devices) 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP
AM79C976KI 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP 制造商:AMD (Advanced Micro Devices) 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*