欢迎访问ic37.com |
会员登录 免费注册
发布采购

AM79C978KC/W 参数 Datasheet PDF下载

AM79C978KC/W图片预览
型号: AM79C978KC/W
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片1/10 Mbps的PCI家庭网络控制器 [Single-Chip 1/10 Mbps PCI Home Networking Controller]
分类和应用: 控制器PC
文件页数/大小: 261 页 / 3499 K
品牌: AMD [ AMD ]
 浏览型号AM79C978KC/W的Datasheet PDF文件第42页浏览型号AM79C978KC/W的Datasheet PDF文件第43页浏览型号AM79C978KC/W的Datasheet PDF文件第44页浏览型号AM79C978KC/W的Datasheet PDF文件第45页浏览型号AM79C978KC/W的Datasheet PDF文件第47页浏览型号AM79C978KC/W的Datasheet PDF文件第48页浏览型号AM79C978KC/W的Datasheet PDF文件第49页浏览型号AM79C978KC/W的Datasheet PDF文件第50页  
ample, the memory system extends the data phase of  
the first access by one wait state. The following three  
data phases take one clock cycle each, which is deter-  
mined by the timing of TRDY. The example assumes  
that EXTREQ (BCR18, bit 8) is set to 1, therefore, REQ  
is not deasserted until the next to last data phase is fin-  
ished.  
Disconnect With Data Transfer  
Figure 18 shows a disconnection in which one last data  
transfer occurs after the target asserted STOP. STOP  
is asserted on clock 4 to start the termination se-  
quence. Data is still transferred during this cycle, since  
both IRDY and TRDY are asserted. The Am79C978  
controller terminates the current transfer with the deas-  
sertion of FRAME on clock 5 and of IRDY one clock  
later. It finally releases the bus on clock 7. If it wants to  
transfer more data, the Am79C978 controller will again  
request the bus after two clock cycles. The starting ad-  
dress of the new transfer will be the address of the next  
non-transferred data.  
Target Initiated Termination  
When the Am79C978 controller is a bus master, the cy-  
cles it produces on the PCI bus may be terminated by  
the target in one of three different ways: disconnect  
with data transfer, disconnect without data transfer, and  
target abort.  
CLK  
1
2
3
4
5
6
7
8
9
FRAME  
ADDR  
0111  
DATA  
DATA  
DATA  
DATA  
AD  
BE  
C/BE  
PAR  
PAR  
PAR  
PAR  
PAR  
PAR  
IRDY  
TRDY  
DEVSEL  
REQ  
GNT  
22206B-20  
DEVSEL is sampled  
Figure 17. Burst Write Transfer (EXTREQ = 1)  
46  
Am79C978  
 复制成功!