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CS8900A-IQ3 参数 Datasheet PDF下载

CS8900A-IQ3图片预览
型号: CS8900A-IQ3
PDF下载: 下载PDF文件 查看货源
内容描述: 水晶局域网? ISA以太网控制器 [Crystal LAN ⑩ ISA Ethernet Controller]
分类和应用: 控制器局域网以太网
文件页数/大小: 128 页 / 1360 K
品牌: CIRRUS [ CIRRUS LOGIC ]
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CS8900A  
Crystal LAN™ ISA Ethernet Controller  
1) A frame is received by the CS8900A, triggering  
an enabled interrupt.  
Offset  
Type  
Description  
0004h Write-only TxCMD (Transmit Command)  
0006h Write-only  
0008h Read-only  
000Ah Read/Write  
000Ch Read/Write  
000Eh Read/Write  
TxLength (Transmit Length)  
Interrupt Status Queue  
PacketPage Pointer  
2) The host reads the Interrupt Status Queue  
(memory base + 0120h) and is informed of the  
receive frame.  
PacketPage Data (Port 0)  
PacketPage Data (Port 1)  
3) The host reads RxStatus (memory base +  
0400h) to learn the status of the receive frame.  
Table 17. I/O Mode Mapping  
4) The host reads RxLength (memory base +  
0402h) to learn the frames length.  
4.10.1 Receive/Transmit Data Ports 0 and 1  
These two ports are used when transferring trans-  
5) The host reads the frame data by executing re- mit data to the CS8900A and receive data from the  
petitive memory-to-memory move instructions CS8900A. Port 0 is used for 16-bit operations and  
(REP MOVS) from memory base + 0404h to  
Ports 0 and 1 are used for 32-bit operations (lower-  
transfer the entire frame from CS8900A mem- order word in Port 0).  
ory to host memory.  
4.10.2 TxCMD Port  
For a more detailed description of receive, see  
Section 5.2 on page 79.  
The host writes the Transmit Command (TxCMD)  
to this port at the start of each transmit operation.  
The Transmit Command tells the CS8900A that the  
host has a frame to be transmitted, as well as how  
that frame should be transmitted. This port is  
mapped into PacketPage base + 0144h. See Regis-  
ter 9 in Section 4.4 on page 47 for more informa-  
tion.  
4.9.5 Polling the CS8900A in Memory Mode  
If interrupts are not used, the host can poll the  
CS8900A to check if receive frames are present  
and if memory space is available for transmit.  
However, this is beyond the scope of this data  
sheet.  
4.10.3 TxLength Port  
4.10 I/O Space Operation  
The length of the frame to be transmitted is written  
here immediately after the Transmit Command is  
written. This port is mapped into PacketPage base  
+ 0146h.  
In I/O Mode, PacketPage memory is accessed  
through eight 16-bit I/O ports that are mapped into  
16 contiguous I/O locations in the host systems I/O  
space. I/O Mode is the default configuration for the  
CS8900A and is always enabled. On power up, the  
default value of the I/O base address is set at 300h.  
(Note that 300h is typically assigned to LAN pe-  
ripherals). The I/O base address may be changed to  
any available XXX0h location, either by loading  
configuration data from the EEPROM, or during  
system setup. Table 17 shows the CS8900A I/O  
Mode mapping.  
4.10.4 Interrupt Status Queue Port  
This port contains the current value of the Interrupt  
Status Queue (ISQ). The ISQ is located at Pack-  
etPage base + 0120h. For a more detailed descrip-  
tion of the ISQ, see Section 5.1 on page 79.  
4.10.5 PacketPage Pointer Port  
The PacketPage Pointer Port is written whenever  
the host wishes to access any of the CS8900As in-  
ternal registers. The first 12 bits (bits 0 through B)  
provide the internal address of the target register to  
be accessed during the current operation. The next  
Offset  
Type  
Description  
0000h Read/Write Receive/Transmit Data (Port 0)  
0002h Read/Write Receive/Transmit Data (Port 1)  
Table 17. I/O Mode Mapping  
CIRRUS LOGIC PRODUCT DATA SHEET  
76  
DS271PP3  
 
 
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