CS3318 datasheet(25/44 Pages) CIRRUS

25 / 44 page

DS693F1

CS3318

input of device N+1 may be repeated for up to 128 devices per single CS signal. If more than 128 devices

are required in a system, separate CS signals may be used to create additional chains of up to 128 devices

per CS signal.

As each device is placed into reset (RESET is low), its ENOut signal is driven low. The ENOut signal will

continue to be driven low until the device is taken out of reset (RESET is high) and the Enable bit (see “En-

able Next Device (Bit 0)” on page 41) is set, at which time the ENOut signal will be driven high.

To configure a unique Individual device address for each device on the shared serial bus, the first device

must be reset (a low to high transition on its RESET pin), the Individual device address register must be

written (using the CS3318’s default device address) with a unique device address, and the Enable bit must

be set to take the next device in the serial control chain out of reset. This process may be repeated until all

devices in the serial control chain have been assigned a new Individual device address. Figure 10 dia-

grams this configuration process.

Notice that Figure 10 shows the setting of the Individual address and the setting of the Enable bit as two

discrete steps. While this demonstrates one approach to device configuration, it should be noted that two

steps are not necessary to complete the action of setting the Individual address and enabling the next de-

vice. This may be done simultaneously with one register write (containing the new Individual address and

the Enable bit set) to the Individual address register.

Apply System Power

Start

Reset the First Device

in the Chain

At this point, the chip addresses of each

device are set to their default value. The

ENout pin on each device is low, holding

each subsequent device in a reset state.

Using the default chip address,

perform a write cycle to change the

Individual chip address register to a

unique value.

Using the new Individual chip address,

perform a write cycle to set the Enable

bit.

From this point forward, the device will only

respond to register reads and writes when

addressed with this new Individual device address.

A device will also respond to register writes when

addressed with its Group 1 or Group 2 address.

Have all the devices in the

chain been assigned a unique

chip address?

This loop steps through the

devices in a chain, setting a

unique Individual chip adress

for each device as it

progresses.

Each device may now be

independently adressed through the

serial bus using the device's assigned

unique chip address.

The Reset input pins of all devices in the chain are

now high. The serial control interface will

communicate with each device in parallel, but each

device will only respond when the first byte clocked

in on the serial control bus matches its Individual,

Group 1 or Group 2 address. If the first byte

clocked in does not match the one of the device's

chip addresses, the device will ignore all

subsequent traffic on the bus until a new

communication cycle is initiated.

Yes

This will cause the device's

ENout pin to be driven high,

bringing the next device in the

chain out of its reset state.

Optionally, device configuration (initial

volume settings, Group addresses,

etc.) may be implemented using the

new Individual device address.

Figure 10. Individual Device Address Configuration Process

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