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參數(shù)資料
| 型號： | GT-48001A |
| 廠商： | Galileo Technology Services, LLC |
| 英文描述： | Switched Ethernet Controller For 10BaseX(10BaseX交換式快速以太網(wǎng)控制器) |
| 中文描述： | 交換式以太網(wǎng)控制器10BaseX（10BaseX交換式快速以太網(wǎng)控制器） |
| 文件頁數(shù)： | 42/101頁 |
| 文件大小： | 1235K |
| 代理商： | GT-48001A |
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GT-48001A Switched Ethernet Controller
Revision 1.6
45
11.4
Plug-and-Play Considerations In PCI Systems
In plug-and-play systems, when the BIOS writes 0xFFFF.FFFF to the Internal/DRAM Base Address register during ini-
tialization, the GT-48001A will return 0xFFC0.0000 when read back indicating the GT-48001A is requesting 4 MBytes
of PCI address space. Designers who wish to use more than one GT-48001A in a plug and play environment must
relocate the multiple GT-48001As into the same 128MByte region (the GalNet Protocol Region.) An alternative solution
is to isolate the GT-48001A’s on a secondary PCI bus through a PCI-to-PCI bridge device with address remapping
capability.
11.5
Unused PCI Bus in Stand-Alone Systems
Single-chip stand-alone applications do not require use of the PCI bus. The PCI bus pins must be connected as shown
in Table 24 to insure proper operation when not using the PCI bus. All pull-up and pull-down resistors should have a
value of 4.7K
. Be sure to have your own reset and 33.0 MHz clock on-board. All other PCI bus signals can remain
unconnected.
11.6
PCI Bus Arbiter in Multiple GalNet Device Systems
All GalNet systems that use more than one device will require a PCI bus arbiter. The arbiter examines the bus request
signals from each device and determines which device is granted the bus. Galileo provides reference designs for PCI
bus arbiters (implemented in inexpensive PALs) on our website.
It is important to note that individual systems may have different arbiter design requirements. For example, if your sys-
tem has several GT-48001A devices and a single GT-48002A (100-Mbps switch) it may make sense to give higher pri-
ority to the higher-speed 100BaseX interfaces.
Table 24: Pin Strapping Requirements for Unused PCI Signals
Pi n Na m e
St ra ppi ng
DevSel*
Pulled up to Vcc
Stop*
Pulled up to Vcc
Par*
No Connect
PErr*
Pulled up to Vcc
Frame*
Pulled up to Vcc
IRdy*
Pulled up to Vcc
TRdy*
Pulled up to Vcc
Gnt*
Pulled down to GND
IdSel*
Pulled down to GND
SErr*
No Connect
Req*
No Connect
Int*
No Connect
AD[31:0]
No Connect
CBE[3:0]
No Connect
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| GT-48002A | Switched Fast Ethernet Controller for 100BaseX(100BaseX交換式快速以太網(wǎng)控制器) |
| GT-48004A | Four Port Switched Fast Ethernet Controller(四端口、交換式快速以太網(wǎng)控制器) |
| GT-48006A | Low Cost Two Port 10/100Mbps Ethernet Bridge/Switch Controller(低成本、雙端口10/100Mbps以太網(wǎng)橋式/交換式控制器) |
| GT-48207 | Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級交換式 10+10/100 BaseX以太網(wǎng)控制器) |
| GT-48208 | Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級交換式 10+10/100 BaseX以太網(wǎng)控制器) |
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