GS9060 datasheet(52/61 Pages) GENNUM

52 / 61 page

GS9060 Data Sheet

22208 - 8

January 2007

52 of 61

Figure 3-8: Gennum Serial Peripheral Interface (GSPI)

3.12.1 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 GS9060 on the rising edge of the serial clock

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

1.5ns (t0 in Figure 3-11 and Figure 3-12) 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 3-9: Command Word

Figure 3-10: Data Word

3.12.2 Data Read and Write Timing

Read and write mode timing for the GSPI interface is shown in Figure 3-11 and

Figure 3-12 respectively. The maximum SCLK frequency allowed is 6.6MHz.

When writing to the registers via the GSPI, the MSB of the data word may be

presented to SDIN immediately following the falling edge of the LSB of the

command word. All SDIN data is sampled on the rising edge of SCLK.

When reading from the registers via the GSPI, the MSB of the data word will be

available on SDOUT 12ns (t5 in Figure 3-11) following the falling edge of the LSB

of the command word, and thus may be read by the host on the very next rising

edge of the clock. The remaining bits are clocked out by the GS9060 on the

negative edges of SCLK.

SCLK

SDOUT

SDIN

SCLK

SDIN

SDOUT

Application Host

GS9060

R/W

RSV

MSB

LSB

D15

D14

D13

D12

D11

D10

MSB

LSB

GS9060 Datasheet(PDF) 52 Page - Gennum Corporation

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