WM8321 datasheet(53/253 Pages) WOLFSON

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Production Data

WM8321

PD, February 2012, Rev 4.0

The OTP and ICE Memory commands are each described in the following sections. Note that, in

some cases, commands may be executed on a single page of memory or may be executed as a Bulk

operation on all available memory pages.

Completion of each OTP or ICE Memory command is indicated via an Interrupt flag, as described in

Section 14.5. The pass/fail outcome of any OTP command is also indicated by the Interrupt bits. Note

that read/write access to the WM8321 Register Map is not supported while a ICE/OTP command is in

progress. It is recommended that the IRQ

¯¯¯ pin is configured to indicate any ICE/OTP Interrupt event;

the host processor should read the OTP/ICE Interrupt event flags to confirm the OTP/ICE command

status following the assertion of the IRQ

¯¯¯ pin.

The programming supply voltage PROGVDD is required for the OTP Write commands and the OTP

Finalise command. It is also necessary to overdrive the LDO12VOUT pin from an external supply.

See Section 6 for details of the required supply voltages.

14.4.1 ENTERING / EXITING THE PROGRAM STATE

The ICE and OTP commands are only supported when the WM8321 is in the PROGRAM state. The

WM8321 can only enter the PROGRAM state as a transition from the OFF state. This is commanded

by setting the OTP_PROG register bit.

Important note - when the PROGRAM state is selected, the WM8321 will read all pages of the OTP

memory into the corresponding pages of the DCRW. This is required in order to confirm if the OTP

contents have already been finalised (see Section 14.4.5). The previous contents of the DCRW

registers will be lost when the PROGRAM state is entered.

The transition into the PROGRAM state can be confirmed by reading the MAIN_STATE register field

as defined in Section 11.2. When the MAIN_STATE register reads back a value of 01011, then the

WM8321 is in the PROGRAM state.

In the PROGRAM state, the ICE and OTP commands are initiated by further writes to the OTP

Control Register (R16394), as described in the following sections.

To exit the PROGRAM state and resume normal operations, a Device Reset must be scheduled.

14.4.2 OTP / ICE READ COMMAND

The Read command loads either one or all data pages from the ICE or OTP into the corresponding

page(s) of the DCRW. The Read commands are selected by writing 1 to the OTP_READ bit.

To read the OTP, the OTP_MEM bit should be set to 1. To read the ICE, the OTP_MEM bit should be

set to 0.

The Read Margin Level is selected by setting the OTP_READ_LVL. Note that this register relates to

the OTP only; it has no effect on ICE Read commands. The recommended setting for the OTP Read

command is ‘Normal’ level. The OTP_READ_LVL field should be set to 00b.

To read a single memory page, the applicable page is selected by setting the OTP_PAGE field. To

read all memory pages, the OTP_BULK bit should be set to 1.

Note that the OTP_PAGE field is defined differently for ICE pages and for OTP pages, as detailed in

Section 14.4.6.

All other bits in the OTP Control Register should be set to 0 when a Read command is issued. (Note

that OTP_PROG should be set to 0 when a Read command is issued.)

For typical applications, the Bulk Read commands are recommended. The OTP Control Register

contents for the OTP / ICE Bulk Read Commands are detailed in Table 20.

READ COMMAND

OTP CONTROL REGISTER VALUE

ICE Read All

0120h

OTP Read All

2120h

Table 20 OTP / ICE Read Command

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