Rainbow Electronics DS3170 - Manual (Page 45)

DS3170 DS3/E3 Single-Chip Transceiver
45 of 233
Figure 7-23. SPI Serial Port Access For Write Mode, SPI_CPOL = 0, SPI_CPHA = 0
0 A13
LSB MSB
SCK
CS*
MOSI
MISO
D7 D6 D5 D4 D3 D2 D1 D0
LSB MSB
A4 A3 A2 A1 A0
LSB MSB
A12 A11 A10 A9 A8 A7 A6 A5 B
Figure 7-24. SPI Serial Port Access For Write Mode, SPI_CPOL = 1, SPI_CPHA = 0
SCK
CS*
0 A13
LSB MSB
MOSI
MISO
D7 D6 D5 D4 D3 D2 D1 D0
LSB MSB
A4 A3 A2 A1 A0
LSB MSB
A12 A11 A10 A9 A8 A7 A6 A5 B
Figure 7-25. SPI Serial Port Access For Write Mode, SPI_CPOL = 0, SPI_CPHA = 1
SCK
CS*
0 A13
LSB MSB
MOSI
MISO
D7 D6 D5 D4 D3 D2 D1 D0
LSB MSB
A4 A3 A2 A1 A0
LSB MSB
A12 A11 A10 A9 A8 A7 A6 A5 B
Figure 7-26. SPI Serial Port Access For Write Mode, SPI_CPOL = 1, SPI_CPHA = 1
SCK
CS*
0 A13
LSB MSB
MOSI
MISO
D7 D6 D5 D4 D3 D2 D1 D0
LSB MSB
A4 A3 A2 A1 A0
LSB MSB
A12 A11 A10 A9 A8 A7 A6 A5 B
7.3.4.2 Parallel Port Interface Diagrams
Figure 7-27 and Figure 7-29 show examples of a 16-bit databus and an 8-bit databus, respectively. In 16-bit mode,
the A[0]/BSWAP signal controls whether or not to byte swap. In 8-bit mode, the A[0]/BSWAP signal is used as the
LSB of the address bus (A[0]). The selection of databus size is determined by the WIDTH input signal. See also
Section
9.1.1 .