PM0020 datasheet(82/87 Pages) STMICROELECTRONICS

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ISC logic description

PM00020

82/87

12.5.20

ISC_ERASE

Description:

Erase single/multiple/all sectors

Requirement:

Part is in ISC mode

ISC_Sector

Shift-In:

64 bits for sector to be erased

Shift-Out:

64 bits don't care

Mode:

ISC

Security:

Partially functional. If secured, only full chip erase (shift in of 64 '1's) is

allowed

When secured, only full chip erase is allowed; i.e. all sectors must be selected for erase.

This is done by shifting in all 64 '1's in step 2 above.

Security status is updated at the end of full chip erase.

If an erase operation is executed on the Configuration Sector, it erases only the information

related to sector protection, CSx mapping, and LVDconfiguration. The Lock OTP information

is not affected. Remember that the Lock OTP can never be erased.

Table 48.

ISC_ERASE sequence

Step

Tap activity

Comment

Run-Test/Idle

Start

IR-Scan

Load ISC_ERASE

DR-Scan

Shift in sector(s) to be erased.

'1' erase; '0' don't erase

Run-Test/Idle

Erase starts

Begin polling

IR-Scan

Load ISC-NOOP

DR-Scan

Shift out status

Repeat step 5 until ready = 1

Run-Test/Idle

End

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