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型號(hào)：	MQ80C32-20
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 20 MHz, MICROCONTROLLER, CQFP44
封裝：	CERAMIC, QFP-44
文件頁數(shù)：	295/1185頁
文件大?。?/td>	5451K
代理商：	MQ80C32-20

SAM9G45 [DATASHEET]

6438K–ATARM–12-Feb-13

Automatic Wait States

Under certain circumstances, the SMC automatically inserts idle cycles between accesses to avoid bus contention

or operation conflict.

Chip Select Wait States

The SMC always inserts an idle cycle between 2 transfers on separate chip selects. This idle cycle ensures that

there is no bus contention between the de-activation of one device and the activation of the next one.

During chip select wait state, all control lines are turned inactive: NBS0 to NBS3, NWR0 to NWR3, NCS[0..5], NRD

lines are all set to 1.

Figure 21-16 illustrates a chip select wait state between access on Chip Select 0 and Chip Select 2.

Figure 21-16. Chip Select Wait State between a Read Access on NCS0 and a Write Access on NCS2

Early Read Wait State

In some cases, the SMC inserts a wait state cycle between a write access and a read access to allow time for the

write cycle to end before the subsequent read cycle begins. This wait state is not generated in addition to a chip

select wait state. The early read cycle thus only occurs between a write and read access to the same memory

device (same chip select).

An early read wait state is automatically inserted if at least one of the following conditions is valid:

if the write controlling signal has no hold time and the read controlling signal has no setup time (Figure 21-17).

in NCS write controlled mode (WRITE_MODE = 0), if there is no hold timing on the NCS signal and the

NCS_RD_SETUP parameter is set to 0, regardless of the read mode (Figure 21-18). The write operation must

end with a NCS rising edge. Without an Early Read Wait State, the write operation could not complete properly.

in NWE controlled mode (WRITE_MODE = 1) and if there is no hold timing (NWE_HOLD = 0), the feedback of

the write control signal is used to control address, data, chip select and byte select lines. If the external write

Read to Write

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
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MQ82380-20/R	制造商:Rochester Electronics LLC 功能描述:
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