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OR3T55-6BA256 参数 Datasheet PDF下载

OR3T55-6BA256图片预览
型号: OR3T55-6BA256
PDF下载: 下载PDF文件 查看货源
内容描述: 3C和3T现场可编程门阵列 [3C and 3T Field-Programmable Gate Arrays]
分类和应用: 现场可编程门阵列可编程逻辑
文件页数/大小: 210 页 / 4391 K
品牌: AGERE [ AGERE SYSTEMS ]
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Data Sheet  
June 1999  
ORCA Series 3C and 3T FPGAs  
Programmable Logic Cells (continued)  
PLC Routing Resources  
INDEPENDENT CIP  
B
Generally, the ORCA Foundry Development System is  
used to automatically route interconnections. Interac-  
tive routing with the ORCA Foundry design editor  
(EPIC) is also available for design optimization. To use  
EPIC for interactive layout, an understanding of the  
routing resources is needed and is provided in this sec-  
tion.  
CD  
=
A
A
B
MULTIPLEXED CIP  
The routing resources consist of switching circuitry and  
metal interconnect segments. Generally, the metal lines  
which carry the signals are designated as routing seg-  
ments. The switching circuitry connects the routing  
segments, providing one or more of three basic func-  
tions: signal switching, amplification, and isolation. A  
net running from a PFU or PIC output (source) to a  
PLC or PIC input (destination) consists of one or more  
routing segments, connected by switching circuitry  
called configurable interconnect points (CIPs).  
CD  
2
O
A
B
C
A
B
C
O
The following sections discuss PLC, PIC, and interquad  
routing resources. This section discusses the PLC  
switching circuitry, intra-PLC routing, inter-PLC routing,  
and clock distribution.  
Key: C = configuration data.  
5-5973(C)  
Figure 18. Configurable Interconnect Point  
Configurable Interconnect Points  
3-Statable Bidirectional Buffers  
The process of connecting routing segments uses  
three basic types of switching circuits: two types of con-  
figurable interconnect points (CIPs) and bidirectional  
buffers (BIDIs). The basic element in CIPs is one or  
more pass transistors, each controlled by a configura-  
tion RAM bit. The two types of CIPs are the mutually  
exclusive (or multiplexed) CIP and the independent CIP.  
Bidirectional buffers, previously described in the SLIC  
section of the programmable logic cell discussion, pro-  
vide isolation as well as amplification for signals routed  
a long distance. Bidirectional buffers are also used to  
route signals diagonally in the PLC (described later in  
the subsection entitled Intra-PLC Routing), and BIDIs  
can be used to indirectly route signals through the  
switching routing (xSW) segments. Any number from  
zero to ten BIDIs can be used in a given PLC.  
A mutually exclusive set of CIPs contains two or more  
CIPs, only one of which can be on at a time. An inde-  
pendent CIP has no such restrictions and can be on  
independent of the state of other CIPs. Figure 18  
shows an example of both types of CIPs.  
Lucent Technologies Inc.  
27