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SP37E760 参数 Datasheet PDF下载

SP37E760图片预览
型号: SP37E760
PDF下载: 下载PDF文件 查看货源
内容描述: 3.3 V的I / O控制器的嵌入式应用 [3.3 V I/O CONTROLLER FOR EMBEDDED APPLICATIONS]
分类和应用: 控制器
文件页数/大小: 78 页 / 507 K
品牌: SMSC [ SMSC CORPORATION ]
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7
CONFIGURATION  
The configuration of the SP37E760 is programmed through hardware selectable Configuration Access Ports that  
appear when the chip is placed into the configuration state. The SP37E760 logical device blocks, if enabled, will  
operate normally in the configuration state.  
7.1 Configuration Access Ports  
The Configuration Access Ports are the CONFIG PORT, the INDEX PORT, and the DATA PORT (Table 23). The  
base address of these registers is controlled by the nRTS2/SYSOPT pin (see Table 1). To determine the  
configuration base address, the state of the nRTS2/SYSOPT pin is latched by the falling edge of a hardware reset. If  
the latched state is a 0, the base address of the Configuration Access Ports is located at address 3F0H; if the latched  
state is a 1, the base address is located at address 370H.  
Table 23 - Configuration Access Ports  
PORT NAME  
CONFIG PORT  
INDEX PORT  
DATA PORT  
SYSOPT = 0  
0x3F0  
SYSOPT = 1  
0x370  
TYPE  
WRITE  
0x3F0  
0x370  
READ/WRITE1,2  
READ/WRITE1  
INDEX PORT + 1  
Note1: The INDEX and DATA ports are active only when the SP37E760 is in the configuration state.  
Note2: The INDEX PORT is only readable in the configuration state.  
7.2 Configuration State  
The configuration registers are used to select programmable chip options. The SP37E760 operates in two possible  
states: the run state and the configuration state. After power up by default the chip is in the run state. To program  
the configuration registers, the configuration state must be explicitly enabled. Programming the configuration  
registers typically follows this sequence:  
1. Enter the Configuration State,  
2. Program the Configuration Register(s),  
3. Exit the Configuration State.  
7.2.1 ENTERING THE CONFIGURATION STATE  
To enter the configuration state write the Configuration Access Key to the CONFIG PORT. The Configuration Access  
Key is one byte of 55H data. The SP37E760 will automatically activate the Configuration Access Ports following this  
procedure.  
7.2.2 CONFIGURATION REGISTER PROGRAMMING  
The SP37E760 contains configuration registers CR00-CR2F. After the SP37E760 enters the configuration state,  
configuration registers can be programmed by first writing the register index number (00 - 2FH) to the Configuration  
Select Register (CSR) through the INDEX PORT and then writing or reading the configuration register contents  
through the DATA PORT. Configuration register access remains enabled until the configuration state is explicitly  
exited.  
7.2.3 EXITING THE CONFIGURATION STATE  
To exit the configuration state, write one byte of AAH data to the CONFIG PORT. The SP37E760 will automatically  
deactivate the Configuration Access Ports following this procedure, at which point configuration register access  
cannot occur until the configuration state is explicitly re-enabled.  
SMSC DS – SP37E760  
Page 45  
Rev. 04/13/2001  
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