CS5378 datasheet(21/88 Pages) CIRRUS

21 / 88 page

CS5378

DS639F2

5. RESET CONTROL

The CS5378 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 18

Reset input, active low.

GPIO7:BOOT - Pin 28

Boot mode select, latched immediately following

reset. Weak (~100 k

Ω) internal pull-up defaults

high, external 10 k

Ω pull-down required to set low.

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.

5.3 Boot Configurations

The logic state of the BOOT pin after reset deter-

mines if the CS5378 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 CS5378

actively reads data from an external serial EE-

PROM and then begins operation in the specified

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 25.

Microcontroller Boot

When the BOOT pin is low after reset, the CS5378

enters an idle state waiting for a microcontroller to

write configuration commands and initialize filter

operation. Configuration commands and data are

written as specified in the ‘Configuration By Mi-

crocontroller’ section of this data sheet, starting on

page 30.

RESET

Self-Tests

SELFTEST

BOOT

EEPROM

Boot

µController

Boot

Figure 11. Reset Control Block Diagram

BOOT

Reset Mode

EEPROM boot

Microcontroller boot

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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