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參數(shù)資料
| 型號： | AX88195P |
| 廠商： | ASIX Electronics Corporation |
| 英文描述： | 10/100BASE Local CPU Bus Fast Ethernet MAC Controller |
| 中文描述： | 一個10/100Base本地CPU總線快速以太網(wǎng)MAC控制器 |
| 文件頁數(shù)： | 36/37頁 |
| 文件大?。?/td> | 414K |
| 代理商： | AX88195P |
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ASIX ELECTRONICS CORPORATION
36
AX88195 Local CPU Bus Fast Ethernet MAC Controller
Appendix C: Application Note for RDY is not applicable
This application note is for some kind of CPU that doesn’t support asynchronous wait state insertion function.
For example, 8051 CPU series have only fix access cycle time. For some application that the CPU has the
capability of wait state insertion, but the designer do not want to use the handshake signal in order to simply the
design. This application note is helpful for those cases.
The following criteria must be meet:
1.
The bus access timing must meet the AC timing specification.
2.
The “remote DMA” move data from/to data port access time can’t faster than 120ns.
Solution:
Because of the access time from FIFO to Packet Buffer RAM or from Packet Buffer RAM to FIFO is
120ns/Word. The “remote DMA read” operation is the only case that RDY signal will be active to request some
wait state to pre-fetch data from RAM into FIFO. As soon as the first word of data feed into the FIFO, the RDY
will not active again for the lasting cycle. For the critical time, just insert “No Operation” instruction (to insert
wait state using software) after write remote DMA read command and before read data port.
Ex : IOBASE=300 ; Insert wait state by software.
Mov dx,308h
Mov al,0h
Out dx,al
Inc dx
Mov al,4dh
Out dx,al
Inc dx
Mov al,40h
Out dx,al
Inc dx
Mov al,40h
Out dx,al
Mov dx,300h
Mov al,0ah
Out dx,al
Nop
Nop
Mov dx,310h
Lea di, RxBuffer
Mov cx, RxLen
Rep insw
…
; Index = 308h
;
; Set Remote Start Address low byte = 0
; Index = 309h
;
; Set Remote Start Address high byte = 4d
; Index = 30Ah
;
; Set Remote DMA Byte Count low byte = 40h
; Index = 30Bh
;
; Set Remote DMA Byte Count high byte = 00h
; Index = 300h
;
;
Set remote DMA read command
; Insert wait state here
; Insert more wait states again if necessary
; Index = 310h
; Set Rx Buffer Address
; Set Rx Length
;
Read data port
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相關(guān)代理商/技術(shù)參數(shù) |
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| AX88196 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10/100BASE 3-in-1 Local CPU Bus Fast Ethernet Controller with Embedded SRAM |
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| AX88196L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10/100BASE 3-in-1 Local CPU Bus Fast Ethernet Controller with Embedded SRAM |
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| AX88615 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5-Port 10/100BASE Ethernet Switch |
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