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EA218I6BTAV 参数 Datasheet PDF下载

EA218I6BTAV图片预览
型号: EA218I6BTAV
PDF下载: 下载PDF文件 查看货源
内容描述: [LAN Controller, CMOS, PBGA352]
分类和应用: 局域网外围集成电路
文件页数/大小: 27 页 / 358 K
品牌: ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
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XpressFlow-2020 Series –  
Ethernet Switch Chipset  
EA218  
6+2 Ports 10Mb Ethernet Access Controller  
2.3 XpressFlow Bus Operation  
9
9
Command Messages for passing control information be-  
tween devices  
Zarlink’s optimized XpressFlow Bus architecture  
Provides 1.6G bps switching bandwidth  
Data Messages for forwarding an Ethernet frame from re-  
ceiving port to transmission port  
9
9
9
-33  
-40  
-50  
1.07G bps  
1.28G bps  
1.6G bps  
Built-in intelligent bus load regulator for data traffic balancing  
Provides centralized bus arbitration with two level request pri-  
orities  
Full multi bus master structure  
9
9
High priority for Data Messages  
Allows XpressFlow Engine to communicate with Access Con-  
trollers via a message passing protocol  
Low priority for Command Messages  
2.3.1 Pin Description  
Symbol  
S_D[31:0]  
Type  
CMOS Data Bus Bit [31:0] – a 32-bit synchronous data bus.  
I/O-TS  
Name and Functions  
Note:  
During the system RESET period, Data Bit [31:28] are used as Processor Interface  
Configuration bit [0:3]  
S_MSGEN#  
S_EOF#  
CMOS Message Envelope – encompasses the entire period of a message transfer. Targets use the  
I/O-TS leading edge of this signal to detect the beginning of a message transfer, and to decode the  
message header for the intended target(s).  
CMOS End of Frame – only used by frame data transfer messages to identify the end of frame condi-  
I/O-TS tion. This signal is synchronous with the Rx Frame Status word appended to the end of the  
message.  
S_IRDY  
CMOS Initiator Ready – a normal true signal. When negated, it indicates the initiator had asserted wait  
I/O-TS state(s) in between command words. Target should use this signal as enable signal for latching  
the data from the bus.  
S_TABT#  
S_HPREQ#  
S_REQ#  
S_GNT#  
S_OVLD#  
S_CLK  
CMOS Target Abort – when asserted, the target had aborted the reception of current message on the  
I/O-OD bus.  
CMOS High Priority Request – indicates one or more Bus Requester is requesting for high priority  
I/O-OD message transfer.  
CMOS Bus Request –Bus Request signals from Access Controller to Bus Access Arbitrator in Xpress-  
Output Flow Engine  
CMOS In- Bus Grant –Bus Grant signals from Bus Arbitrator to Bus Requester  
put  
CMOS Bus Overload – when asserted, all data forwarding bus bandwidth has been allocated. Cannot  
Output support additional load for data forwarding traffic.  
CMOS XpressFlow Bus Clock – 33MHz system clock  
Input  
© 1998 Zarlink Semiconductor, Inc.  
15  
Rev. 2.1- February, 1999