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SC9821C Datasheet(PDF) 7 Page - Silan Microelectronics Joint-stock |
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SC9821C Datasheet(HTML) 7 Page - Silan Microelectronics Joint-stock |
7 / 18 page SC9821C HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.0 2006.07.21 Http: www.silan.com.cn Page 7 of 18 Address[3:0]: Assign the operation object. Note: When Address [3:0] = 4’ b1111, all the Guests will be operation objects (common), but at this time, the Guest should close the feedback channel and only receive the data sending by Host. And when select the only Guest, it can be bidirectional communication (respective). BurstLength: Denote the operation length of Burst. Addr: 8-bit addressing address of Host. Ack: It is an acknowledge signal. In the address check all modes; this signal is only used as leading data (low level) to denote the beginning of the data pack because the feedback channel of Guest is closed. In one-to-one mode, After the Guest receives a serial of pack leading with Command byte; it must feed back to Host an Ack signal in defined time which is decided by Host itself. When sending the data, if the transmission direction is from Host to Guest this time, Guest must feed back an Ack signal in defined time every time it receives a data; if overstep, Host will pull up DataAvail and end this transmission. When Host sends the data, if there is other data needed transmission after Host receives the Ack signal, it must transmit following the next cycle; When Host receives data, it must come into receiving state (otherwise end this transmission directly) after Host receives the Ack signal. Data: The transmitted data is following the leading Ack signal, and the latter limited a data when Burst is 0. When over the provision data, the receiver may not correspond to Ack signal. According to above description, if complete the operations from Host to Guest, the read-write operation is as followed: Adopt 8-bit effective address, and assume the addressing address of guest is 0H: Figure 2 SSI write operation Figure 3 SSI read operation |
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