參數(shù)資料
型號(hào): CYNSE70064A
廠商: Cypress Semiconductor Corp.
英文描述: Search Engine
中文描述: 搜索引擎
文件頁數(shù): 116/127頁
文件大小: 3275K
代理商: CYNSE70064A
CYNSE70064A
Document #: 38-02041 Rev. *E
Page 116 of 127
13.0
Power
13.1
The proper power-up sequence is required to correctly initialize the Cypress NSEs before functional access to the device can
begin. RST_L and TRST_L should be held low before the power supplies ramp-up. RST_L must be set low for a duration of time
afterward and then set high. The following steps describe the proper power-up sequence.
1. Set RST_L and TRST_L low.
2. Power up V
DD
, V
DDQ
and start running CLK2X and PHS_L. The order in which these signals (including V
DD
and V
DDQ
) are
applied is not critical.
3. Hold RST_L low for a minimum of 64 CLK2X cycles. The counting starts on the first rising edge of CLK2X when PHS_L is
high, after both V
DD
and V
DDQ
have reached their steady state voltages. Set RST_L high afterward to complete the power-up
sequence. For JTAG reset, TRST_L can be brought high after both V
DD
and V
DDQ
have reached their steady state voltages.
Figure 13-1
illustrates the proper sequences of the power-up operation.
Proper Power-up Sequence
14.0
Application
Figure 14-1
shows how a Search engine subsystem can be formed using a host ASIC and an CYNSE70064A bank. It also shows
how this Search engine subsystem is integrated in a switch or router. The CYNSE70064A can access synchronous and
asynchronous SRAMs by allowing the host ASIC to set the same HLAT parameter in all search engines within a bank of search
engines.
VDD
VDDQ
64 CLK2x
cycles
CLK2x
PHS_L
RST_L
TRST_L
Figure 13-1. Power-up Sequence
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