6.5.2 SBI

Side-Band Interface (SBI) is a simple 3-wire serial interface. This interface consists of DATA, CLK and

SHFT_LD# pins. When the SHFT_LD# pin is high, the rising edge of CLK clocks DATA into a shift register.

After shifting data, the falling edge of SHFT_LD# loads the shift register contents into the Output Register. Both

the SBI and the traditional SMBus interface feed common output enable/disable synchronization logic, which

ensures glitch-free enable and disable outputs regardless of the method used.

SBI can be configured at a system level in three ways: star topology, daisy chain topology, and directly. The star

topology is shown in Figure 6-3. The daisy chain topology is shown in Figure 6-4.

SBI

Controller

CDCDB2000

(1)

CDCDB2000

(2)

DATA

CLK

SHFT_LD# (2)

SHFT_LD# (1)

Figure 6-3. SBI Star Topology

SBI

Controller

CK440Q

CDCDB2000

SBI_IN

CLK

SHFT_LD#

DATA

SBI_OUT

Figure 6-4. SBI Daisy Chain Topology

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CDCDB2000

SNAS787B – NOVEMBER 2019 – REVISED OCTOBER 2024

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