GS9062-CFE3 datasheet(38/46 Pages) GENNUM

38 / 46 page

GS9062 Data Sheet

22209 - 7

February 2007

38 of 46

devices to be connected in parallel and selected via the CS input. The interface is

illustrated in the Figure 3-6 below.

All read or write access to the GS9062 is initiated and terminated by the host

processor. Each access always begins with a 16-bit command word on SDIN

indicating the address of the register of interest. This is followed by a 16-bit data

word on SDIN in write mode, or a 16-bit data word on SDOUT in read mode.

Figure 3-6: Gennum Serial Peripheral Interface (GSPI)

3.10.1 Command Word Description

The command word is transmitted MSB first and contains a read/write bit, nine

reserved bits and a 6-bit register address. Set R/W = '1' to read and R/W = '0' to

write from the GSPI.

Command words are clocked into the GS9062 on the rising edge of the serial clock

SCLK. The appropriate chip select signal, CS, must be asserted low a minimum of

1.5ns (t0 in Figure 3-9 and Figure 3-10) before the first clock edge to ensure proper

operation.

Each command word must be followed by only one data word to ensure proper

operation.

Figure 3-7: Command Word

Figure 3-8: Data Word

SCLK

SDOUT

SDIN

SCLK

SDIN

SDOUT

Application Host

GS9062

R/W

RSV

MSB

LSB

D15

D14

D13

D12

D11

D10

MSB

LSB

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