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Am29LV400B
Data Sheet Supplement PROM Programmer Manufacturers
This supplement with Am29LV400B data sheet, document number 21523. This document describes sector protection sector unprotection functions intended programming equipment. Am29LV400B device also offers in-system sector protection unprotection. Refer data sheet more information.
Sector Unprotection
Sectors previously protected subsequently unprotected accommodate code changes, using Sector Unprotect Mode. Prior initiating code change previously protected sector sectors must placed into Sector Protect Mode using Sector Protection Algorithm. activate sector unprotection, apply 10%; programming equipment must then force address control (VID RESET#, sector addresses A17-A12 should sector unprotected. unprotection mechanism begins falling edge pulse terminated with rising edge same. Refer Figure Figure sector unprotection algorithm waveforms. Remove prior removing VCC. Verification sector unprotection similar that sector protection. programming equipment must force address with Scanning sector addresses A17-A12 while (A6, (VIH, VIH, VIL) will produce device outputs (DQ0-DQ7) unprotected sector. this mode, lower order addresses, except don't care. Address locations with reserved Autoselect manufacturer device codes. Note that temporary sector unprotect procedure found Am29LV400B data sheet.
Sector Protection
Am29LV400B features hardware sector protection. This feature will disable both program erase operations number available sectors. sector protect feature enabled using programming equipment user's site. Devices shipped with sectors unprotected. Alternatively, program protect sectors factory prior shipping device (AMD's ExpressFlashService). activate sector protect mode, apply 10%; programming equipment must then force address control OE#, (VID CE#, RESET#. sector addresses A17-A12 should sector protected. Programming protection circuitry begins falling edge pulse terminated with rising edge same. Sector addresses must held constant during pulse. Refer Figure Figure sector protection algorithm waveforms. Remove prior removing VCC. verify programming protection circuitry, programming equipment must force address with VIH. Scanning sector addresses A17-A12 while (A6, (VIL, VIH, VIL) will produce device outputs (DQ0- DQ7) protected sector. this mode, lower order addresses, except don't care. Address locations with reserved Autoselect manufacturer device codes.
Publication# 20873 Rev: Amendment/1 Issue Date: March 1999
CHARACTERISTICS
Parameter Symbol ILIT Parameter Description Voltage Autoselect Sector Protection Input High Voltage Input Voltage Device Power High Voltage Input Load Current VCC=VCCmax, 12.5 Test Conditions 11.5 -0.5 12.5 Unit
CHARACTERISTICS
Sector Protect/Unprotect Timing Operations
Parameter Symbol Standard tACC tVIDR tWPP1 tWPP2 tOESP tCSP Description Address Output Delay (Note Output Enable Output Delay (Note Voltage Transition Time (Note Write Pulse Width (Note Write Pulse Width (Note Setup Time Active (Note Setup Time Active (Note Voltage Setup Time Speed Options Unit
Notes: higher performance specifications tACC required, refer Read Operations table Specifications section Am29LV400B data sheet. 100% tested. These timings Sector Protect operation. These timings Sector Unprotect operation.
SECTOR PROTECTION/UNPROTECTION VERIFY (HIGH VOLTAGE MODE)
Type Verify Sector Protection Verify Sector Unprotection A17-A12 Sector Addresses* DQ7-DQ0 (Hex)
Refer Am29LV400B datasheet sector address tables.
Am29LV400B
Start
Sector Addr A17-A12
PLSCNT
±10% OE#, VID; RESET#, VIH; CE#, VIL;
Activate Pulse
Time
Increment PLSCNT
CE#, should remain
Read from Sector: Addr VIH, VIL, PLSCNT Data 01h?
Protect Another Sector? Remove from Write Reset Command
Device Failed
Sector Protection Complete
20873C-1
Figure
Sector Protection Algorithm
Am29LV400B
SWITCHING WAVEFORMS
A17-A12
tVIDR tVIDR tOESP tWPP1 tVIDR
tCSP Data RESET#
Sector Address initial sector Sector Address next sector
20873C-2
Figure
Waveforms Sector Protection
Am29LV400B
Start
Protect Sectors Refer Figure
PLSCNT
±10% OE#, VID; RESET#, VIH; CE#, VIL;
Activate Pulse Increment PLSCNT Time
OE#, VIL; VIH;
Sector Addr VIL;
Read Data from Device PLSCNT 1000? Device Failed
Increment Sector Addr
Data 00h? Sector Addr SA10? Remove from
Sector Unprotection Completed
20873C-3
Figure Sector Unprotect Algorithm
Am29LV400B
SWITCHING WAVEFORMS
A17-A12
tVIDR tVIDR tOESP tCSP Data tWPP2 tVIDR
RESET#
20873C-4
Figure
Waveforms Sector Unprotect
Am29LV400B
REVISION SUMMARY Revision
Updated from Am29LV400 AmLV400B device.
Revision (March 1999)
Characteristics tOE: Added Note
Revision
Updated speed options.
Trademarks Copyright 1999 Advanced Micro Devices, Inc. rights reserved. AMD, logo, combinations thereof registered trademarks Advanced Micro Devices, Inc. ExpressFlash trademark Advanced Micro Devices, Inc. Product names used this publication identification purposes only trademarks their respective companies.
Am29LV400B
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