S1M8660A Datasheet, PDF (20/32 Pages) Samsung semiconductor – RX IF / BBA WITH GPS

S1M8660A (Preliminary)
RX IF/BBA WITH GPS
Serial Data Transfer format
S1M8660A and S1M8657 are all slave devices with the SPI bus. What differentiate them from one another is
their different device IDs. Each company has its own characteristic SPI bus configuration , but normally the 3-line
bus is most often used and sometimes the 2-line bus such as the IIC bus. Figure 13. shows the serial data
transfer format.
STB
CLK
DATA
D5 D4 D3 D2 D1 D0
Start bit
mode=01
Master drive
Slave Address
Dummy
1=Master read
D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
Master drive
Register
Address
Dummy
Slave drive
data
Dummy
0=Master read
D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Master drive
Register
Address
Dummy
Master drive
data
Dummy
End bit
Figure 13. Serial Data Transfer Format
(1) The first 2-BITs are for transmission only and this product must send '01'.(Others are not permitted.)
(2) The following 6-bit data specifies the slave device, which is connected to the SPI bus and has its own ID.
(3) The following 1-bit is a dummy bit, which marks the end of the 8-bit data transmission and the beginning of
the next data to be sent.
(4) The following 1-bit decides on whether the master will drive the data line or the slave will. If this bit is '1', the
master will drive , but if '0' the slave will drive the data line.
(5) The following 7-bit data is the register address of the specified slave device; the 7-bits for an address allows
128 register addresses for slaves.
(6) The following high 1-BIT data is a dummy data.
(7) The following 8-BIT data is the data in the device to be driven.
(8) The following 1-BIT data is a dummy data, which marks the end of the 8-bit data transmission and
beginning of the next data to be sent.
(9) The following 1-bit decides on whether the master will drive the data line or the slave will. If this bit is '1', the
master will drive , but if '0' the slave will drive the data line.
(10) The following 7-bit data is the register address of the specified slave device.
(11) The following high 1-BIT data is a dummy data.
(12) The following 8-BIT data is the data in the device to be driven.
(Continous data transmission such as this can be ended with a 1-byte transmission or can be read/written
repeatedly.)
(13) After the last data is sent, the data line opens and becomes high;
(14) the CLK continues for half the 1-clock cycle and then becomes high;
(15) and the STB becomes high as soon as the clock becomes high and this marks the end of data transmission.
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