CS5376A datasheet(23/107 Pages) CIRRUS

23 / 107 page

CS5376A

5. RESET CONTROL

The CS5376A reset signal is active low. When re-

leased, a series of self-tests are performed and the

device either actively boots from an external EE-

PROM or enters an idle state waiting for microcon-

troller configuration.

5.1 Pin Descriptions

RESET - Pin 55

Reset input, active low.

BOOT - Pin 56

Boot mode select, latched following a RESET ris-

ing edge.

BOOT = 1 = EEPROM boot

BOOT = 0 = Microcontroller boot

5.2 Reset Self-Tests

After RESET is released but before booting, a se-

ries of digital filter self-tests are run. Results are

combined into the SELFTEST register (0x2F),

with 0x0AAAAA indicating all passed. Self-tests

require 60 ms to complete, after which configura-

tion commands are serviced.

5.3 Boot Configurations

The logic state of the BOOT pin after reset deter-

mines if the CS5376A actively reads configuration

information from EEPROM or enters an idle state

waiting for a microcontroller to write configuration

commands.

EEPROM Boot

When the BOOT pin is high after reset, the

CS5376A actively reads data from an external seri-

al EEPROM and then begins operation in the spec-

ified configuration. Configuration commands and

data are encoded in the EEPROM as specified in

the ‘Configuration By EEPROM’ section of this

data sheet, starting on page 26.

Microcontroller Boot

When the BOOT pin is low after reset, the

CS5376A enters an idle state waiting for a micro-

controller to write configuration commands and

initialize filter operation. Configuration commands

and data are written as specified in the ‘Configura-

tion By Microcontroller’ section of this data sheet,

starting on page 32.

RESET

Self-Tests

SELFTEST

BOOT

EEPROM

Boot

µController

Boot

Figure 11. Reset Control Block Diagram

Self-Test

Type

Pass

Code

Fail

Code

Program ROM

0x00000A

0x00000F

Data ROM

0x0000A0

0x0000F0

Program RAM

0x000A00

0x000F00

Data RAM

0x00A000

0x00F000

Execution Unit

0x0A0000

0x0F0000

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