I2S+BUS协议

Table 1. Timing for I2S transmitters and receivers

NOTES:

1.The system clock period T must be greater than T tr and T r because both the transmitter and receiver have to be able to handle the data

transfer rate.

2a.At all data rates in the master mode, the transmitter or receiver generates a clock signal with a fixed mark/space ratio. For this reason t HC and t LC are specified with respect to T.

2b.In the slave mode, the transmitter and receiver need a clock signal with minimum HIGH and LOW periods so that they can detect the signal.

So long as the minimum periods are greater than 0.35T r, any clock that meets the requirements can be used (see Figure 3).

3.Because the delay (t dtr) and the maximum transmitter speed (defined by T tr) are related, a fast transmitter driven by a slow clock edge can

result in t dtr not exceeding t RC which means t htr becomes zero or negative. Therefore, the transmitter has to guarantee that t htr is greater than or equal to zero, so long as the clock rise-time t RC is not more than t RCmax, where t RCmax is not less than 0.15T tr.

废气焚烧4.To allow data to be clocked out on a falling edge, the delay is specified with respect to the rising edge of the clock signal and T, always giving

the receiver sufficient set-up time.

5.The data set-up and hold time must not be less than the specified receiver set-up and hold time.

古代蹴鞠用什么做的5.0VOLTAGE LEVEL SPECIFICATION

5.1Output Levels

V L<0.4V

V H> 2.4V both levels able to drive one standard TTL input (I IL =–1.6mA and

I IH = 0.04mA).

5.2Input Levels

V IL=0.8V

V IH= 2.0V

Note:At present, TTL is considered a standard for logic levels. As other IC (LSI) technologies become popular, other levels will

also be supported.6.0POSSIBLE HARDWARE CONFIGURATIONS 6.1Transmitter (see Figure 5)

At each WS-level change, a pulse WSP is derived for synchronously parallel-loading the shift register. The output of one of the data latches is then enabled depending on the WS signal. Since the serial data input is zero, all the bits after the LSB will also be zero. 6.2Receiver (see Figure 6)

Following the first WS-level change, WSP will reset the counter on the falling edge of SCK. After decoding the counter value in a “1 out of n” decoder, the MSB latch (B1) is enabled (EN1 = 1), and the first serial data bit (the MSB) is latched into B1 on the rising edge of SCK. As the counter increases by one every clock pulse, subsequent data bits are latched into B2 to Bn.

On the next WS-level change, the contents of the n latches are written in parallel, depending on WSD, into either the left or the right data-word latch. After this, latches B2 to Bn are cleared and the counter reset. If there are more than n serial data bits to be latched, the counter is inhibited after Bn (the receiver’s LSB) is filled and subsequent bits are ignored.

大襟衣

Note:The counter and decoder can be replaced by an n-bit shift-register (see Figure 7) in which a single ‘1’ is loaded

into the MSB position when WSP occurs. On every

subsequent clock pulse, this ‘1’ shifts one place, enabling the

地面数字电视接收机N latches. This configuration may prove useful if the layout

2dj

has to be taken into account.

升降机构

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