參數(shù)資料
型號(hào)： 82557
廠商： Intel Corp.
英文描述： Fast Ethernet PCI Bus Controller(快速以太網(wǎng) PCI總線控制器)
中文描述： 快速以太網(wǎng)PCI總線控制器（快速以太網(wǎng)的PCI總線控制器）
文件頁(yè)數(shù)： 54/57頁(yè)
文件大小： 601K
代理商： 82557
INTEL 82557 FAST ETHERNET PCI BUS CONTROLLER
54
value. The third is the Vendor ID / SubSystem Vendor ID value. The default values for the configurable fields
are as follows:
1.
Device ID - 1229h (82557).
2.
Vendor ID - 8086h (Intel).
3.
SubSystem ID - 0.
4.
SubSystem Vendor ID - 0.
The 82557C checks bits number 15,14, and 13 in the first word read from the EEPROM (address Ah) and acts
as follows:
bits 15,14
bit 13
Device ID
Vendor ID
Revision
ID
SubSystem
ID
SubSystem Vendor
ID
11,10,00
X
1229h
8086h
02h
0000h
0000h
01
0
1229h
8086h
02h
Word Bh
Word Ch
01
1
Word Bh
Word Ch
02h
Word Bh
Word Ch
The above table implies that if the 82557C detects the presence of an EEPROM (as indicated by bits 15 and 14
having a value of 01), then bit number 13 determines whether the value read from the EEPROM, words Bh and
Ch, will be loaded either into the SubSystem ID and SubSystem Vendor ID fields only or into the Device ID and
Vendor ID fields too. There is no way to program the Device ID and Vendor ID fields without setting the
SubSystem ID and SubSystem Vendor ID fields to the same value. The 82557C always returns the fixed value
of 02h in the revision field regardless of the EEPROM programming.
From the deassertion of reset and until the completion of the automatic EEPROM reading, the 82557C does not
respond to any PCI configuration cycles. If the 82557C happens to be accessed during this time, it will retry the
access.
8.3
Retry Premature Accesses
As mentioned above, the 82557C responds with a Retry to any configuration cycle accessing the 82557C before
the completion of the automatic read of EEPROM. The 82557C may continue to Retry any configuration
accesses until the EEPROM read process is completed. The 82557C does not enforce the rule that the retried
master must attempt to access the same address again in order to complete any delayed transaction -- any
master access to the 82557C after the completion of the EEPROM read will be honored.
相關(guān)PDF資料
PDF描述
82559 Fast Ethernet Multifunction PCI/CARD bus controller(快速以太網(wǎng)多功能PCI/CARD 總線控制器)
8255A-5 PROGRAMMABLE PERIPHEAL INTERFACE
8255A IC LOGIC 3257 4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER -40+85C SSOP-16 - OBSOLETE
8255A Programmable Peripheral Interface iAPX86 Family
8255A-5 12-Bit, 2.7 V to 5.25 V, 1.5 MSPS Low Power ADC; Package: SOIC - Wide; No of Pins: 24; Temperature Range: Industrial
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
8255702-025 制造商:ITT Interconnect Solutions 功能描述:NASA CONNECTOR - Bulk
8255702-095 制造商:ITT Interconnect Solutions 功能描述:NASA CONNECTOR - Bulk
8255702-096 制造商:ITT Interconnect Solutions 功能描述:NASA CONNECTOR - Bulk
8255702-098 制造商:ITT Interconnect Solutions 功能描述:NASA CONNECTOR - Bulk
8255704-050 制造商:ITT Interconnect Solutions 功能描述:NASA CONNECTOR - Bulk
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*