sc9822p Silan, sc9822p Datasheet - Page 27

• Manufacturer Part Number: sc9822p
• Description: Mp3 Decoder With Esp Function And Cd Interface
• Manufacturer: Silan

HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
byte length (don’ t have this byte in non Burst mode); Addr is 8-bit address length. Data0~DataN is to define
the length of BurstLength; the leading Ack is given to Guest by Host (Customers address check all mode
common), and may be fed back by Guest. That is all decided by the information of Command pack.
8 bits of Command byte are as followed:
Read/Write:
Burst:
Reset:
AddrExtend:
Address[3:0]:
BurstLength:
Addr:
Ack:
Command: In the process of the whole protocol processing, the Command pack byte is critical.
In the above transmission, Command pack explains the type of the frame; BurstLength suggests the data
Read/Write
Bit7
Burst
Bit6
Read-write flag bit; 1 denotes read data from Guest to Host, and 0 denotes the data
flow is from Host to Guest.
Denote it is whether in Burst mode; 1 denotes this mode, and the byte behind
Command byte is used as denoting the Burst length.
1 denotes selected Guest reset, at this time, have no next byte; When Burst and Reset
are 1 at the same time, denotes short command form. The form of short command is
introduced in power management.
1 denotes this operation based on 16-bit address mode, and high 8-bit follows the low
8-bit; 0 is default 8-bit address operation mode.
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 selected the only
Guest, it can be bidirectional communication (respective).
Denote the operation length of Burst.
8-bit addressing address of Host.
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.
Reset
Bit5
AddrExtend
Figure 1 SSI frame signal
Bit4
Address[3]
Bit3
Address[2]
Bit2
Address[1]
REV:1.0
Bit1
SC9822P
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Address[0]
2006.07.21
Bit0