參數(shù)資料
型號: PM5372-BI
英文描述: Telecommunication IC
中文描述: 通信集成電路
文件頁數(shù): 129/169頁
文件大?。?/td> 989K
代理商: PM5372-BI
TSE Transmission Switch Element Datasheet
Released
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1991258, Issue 7
129
A transmission speed of 2/3 the speed of light, this corresponds to a trace length difference of
41.2m:
205.8x10
9
s x 2/3 x 3x10
8
m/s = 41.2 m
However, it is important to note that the LVDS interface itself is designed to drive 1m of
backplane plus only 30cm of trace length on either side. Since this 1.6m of trace length is smaller
than the maximum trace length differential computed above, the TSE’s ability to tolerate trace
length differential will not be a limiting factor for designs.
The total available trace length of 1.6m corresponds to 8ns of delay or a worst case difference of
0.6 clock cycles (77.76 MHz) between any two LVDS links. Low loss cable or an optical
interface can be used to connect to the LVDS interface to realize greater back-plane distances.
12.5 JTAG Support
The TSE supports the IEEE Boundary Scan Specification as described in the IEEE 1149.1
standards. The Test Access Port (TAP) consists of the five standard pins, TRSTB, TCK, TMS,
TDI and TDO used to control the TAP controller and the boundary scan registers. The TRSTB
input is the active-low reset signal used to reset the TAP controller. TCK is the test clock used to
sample data on input, TDI and to output data on output, TDO. The TMS input is used to direct
the TAP controller through its states. The basic boundary scan architecture is shown below.
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