参数资料
型号: GT-48208
厂商: Galileo Technology Services, LLC
英文描述: Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高级交换式 10+10/100 BaseX以太网控制器)
中文描述: 先进的交换式以太网控制器的10 10/100 BaseX(高级交换式10 10/100 BaseX以太网控制器)
文件页数: 99/135页
文件大小: 1619K
代理商: GT-48208
GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
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Revision 1.2
15.
RESET CONFIGURATION
The GT-482xx uses several pins as configuration inputs to set certain parameters following a RESET. The defini-
tion of the configuration pins changes immediately after RESET to their normal function.
15.1
Configuration Pins
Configuration pins must be externally pulled up or down at RESET to select the desired operational parameter.
The recommended value of the pull-up/down resistors is 4.7K Ohms. Table 16 shows the configuration pins for the
GT-482xx. It is recommended to pull up the pins for unmanaged systems unless the user chooses to set a specific
feature, for example, pull down the DData[23:0] to set the ports to 10Base-T.
Table 16: RESET Pin Strapping Options
Pi n
C onfigur ation Function
DAddr[4:0]
GT-482xx Base Address
DAddr[5]
ForceLinkPass12
0-
1-
Force link
Do not force link
DAddr[6]
ForceLinkPass13
0-
1-
Force link
Do not force link
DAddr[7]
Disable Transmit Watchdog
0-
1-
disable
enable
DAddr[8]
Virtual LAN Tagging Packet Extension mode
0-
1-
Accept packets up to 1518 bytes in length
Accept packets up to 1536 bytes in length
DAddr[9]
Skip Init
0-
1-
Skip initialization
Do not skip initialization
DAddr[10]
Disable Buffer Threshold
0-
1-
disable (dynamic buffer allocation)
enable (fixed buffer allocation)
DAddr[11]
BackPressure Enable/Disable
0-
1-
disable
enable
DData[23:0]
10Mbps serial mode (two bits per port, DData[1:0] for Port 0, DData[3:2] for Port
1,...,DData[23:22] for Port 11)
00
01
10
11
10Base-T
10Base-FL
AUI
Reserved
DData[24]
Full duplex mode for port #12
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