參數(shù)資料
型號(hào)： MC92602ZTA
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196
封裝： MAPBGA-196
文件頁數(shù)： 48/98頁
文件大?。?/td> 896K
代理商： MC92602ZTA
5-2
MC92602 SERDES Reference Manual
MOTOROLA
Startup
5.2
Startup
The MC92602 begins a startup sequence upon application of the reference clock
(REF_CLK_N/P input) to the device. This is considered a cold startup. The cold startup
sequence is as follows:
1. PLL Startup
2. Receiver Initialization and Byte Alignment
3. Word Alignment (if enabled)
4. Run
The expected duration of each step in the startup sequence is shown in Table 5-2. A cold
startup can be initiated at any time by setting RESET low. It is recommended that RESET
be low at initial startup, however, it is not strictly required.
5.3
Standby Mode
Standby mode puts the MC92602 into a low power, inactive state. When STNDBY is
asserted high, the device will force all transmitter link outputs to their disabled state as
dened in Section 2.3.3, and will disable all internal clocking. An important feature of
standby mode is that the internal PLL is not disabled. It remains operating and locked to the
reference clock. This greatly reduces the time needed to recover from standby mode to run
mode, as only the receiver initialization and word alignment startup steps are required.
5.4
Conguration and Control Signals
The MC92602 has many conguration and control signals that are asynchronous to all
inputs clocks. Most of the signals affect the internal conguration state and must be set at
power-up. If their state is changed after power-up, some require that the chip be reset by
setting RESET low and then releasing high. While other conguration signals are meant to
be changed during normal operation and do not require chip reset. However, these signals
may still affect device operation. Table 5-3 lists all of the MC92602’s asynchronous
Table 5-2. Startup Sequence Step Duration
Startup Step
Typical Duration
(in bit times)
Note
PLL Startup
10,2400 + 25
s
Receiver Initialization
50
WSE = low
160
WSE = high
Word Alignment
50
WSE = low
160
WSE = high
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