WM8310CGEBSLASHV datasheet(63/291 Pages) WOLFSON

63 / 291 page

Pre-Production

WM8310

PP, May 2012, Rev 3.1

Most of the DCRW contents are duplicates of control registers that exist in the main register area

below the DCRW addresses. In theses cases, reading or writing to either address will have the same

effect.

Some register fields are defined only in the DCRW area; a detailed description of these fields is

provided in the following sub-sections.

14.6.1

DCRW PAGE 0

Page 0 of the DCRW occupies register addresses R30720 (7800h) to R30727 (7807h). This contains

factory-preset data which is loaded from OTP when an ‘ON’ state transition is scheduled.

Page 0 of the DCRW contains a 128-bit unique ID. Note that these fields are Read-Only in the OTP

and cannot be changed.

14.6.2

DCRW PAGE 1

Page 1 of the DCRW occupies register addresses R30728 (7808h) to R30735 (780Fh). This contains

factory-preset data which is loaded from OTP when an ‘ON’ state transition is scheduled.

Page 1 of the DCRW contains trim parameters that ensure the accuracy of the voltage references

and the power management RC oscillator. Note that these fields are Read-Only in the OTP and

cannot be changed.

14.6.3

DCRW PAGE 2

Page 2 of the DCRW occupies register addresses R30736 (7810h) to R30743 (7817h). This contains

user-programmable data.

This page of data is normally loaded from OTP when ‘ON’ state transition is scheduled (except in

Development Mode or if RECONFIG_AT_ON = 0). This page of data can also be loaded from OTP

using the OTP_READ command; it can be written to the OTP using the OTP_WRITE command.

This page of data is loaded from the first page of ICE memory (00h to 0Fh) when ‘ON’ state transition

is scheduled in Development Mode (if RECONFIG_AT_ON = 1). This page of data can also be

loaded from ICE using the ICE Read command. Note that ICE Address 00h corresponds to bits 15:8

at the start address of DCRW Page 2; ICE Address 01h corresponds to bits 7:0 at the same DCRW

address.

If the WM8310 configuration data is loaded from external ICE in response to an ‘ON’ state transition

request, and the OTP_AUTO_PROG register bit is set, then the WM8310 will program the OTP with

the contents Page 2 and Page 3 of the DCRW data, after the ICE data has been loaded and

confirmed as valid. The WM8310 will also perform a Margin 1 Verify as part of the auto-program

function.

The programming supply voltage PROGVDD is required for the OTP_AUTO_PROG command. It is

also necessary to overdrive the LDO12VOUT pin from an external supply. See Section 6 for details of

the required supply voltages.

Using the auto-program function described above, the OTP will be finalised if the OTP_CUST_FINAL

bit is set in the ICE data. Completion of the auto-program is indicated using the OTP interrupts, as

described in Section 14.5. The auto-program completion is also indicated on the Status LED outputs,

as described in Section 22.

The OTP_CUST_ID field is used to hold a Customer Identifier for the OTP data contents. Whenever

an ‘ON’ state transition is requested, then the OTP_CUST_ID field is checked to confirm valid OTP

data. If the OTP_CUST_ID field is set to zero, then the WM8310 remains in the OFF power state. A

non-zero OTP_CUST_ID field is used to confirm valid OTP contents.

The OTP_CUST_FINAL bit is used to control whether the user-programmable OTP data (Page 2 and

Page 3) is finalised. If OTP_CUST_FINAL is set in the OTP and also set in the DCRW, then the

WM8310 prevents any further Writes to the OTP. If the DCRW has been loaded from the OTP, then

the OTP_CUST_FINAL bit indicates whether any further Write operations are possible. If the DCRW

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