Am29BL162C

SUPPLEMENT
Am29BL162C
Data Sheet Supplement for PROM Programmer Manufacturers
This supplement is for use with the Am29BL162C data
sheet, publication number 22142. This document
describes the sector protection and sector unprotection
functions intended for programming equipment. The
Am29BL162C device also offers in-system sector protection and unprotection. Refer to the data sheet for
more information.
Sector Protection
The Am29BL162C features hardware sector protection.
This feature will disable both program and erase operations in any number of available sectors. The sector
protect feature is enabled using programming equipment at the user’s site. Devices are shipped with all
sectors unprotected. Alternatively, AMD may program
and protect sectors in the factory prior to shipping the
device (AMD’s ExpressFlash™ Service).
To activate the sector protect mode, apply VCC = 3.3 V ±
10%; the programming equipment must then force VID
on address pin A9 and control pin OE#, (VID = 12 V ±
0.5 V), VIL on CE#, A6, and A0, VIH on A1 and RESET#.
The sector addresses on A19–A12 should be set to the
sector to be protected. Programming of the protection
circuitry begins on the falling edge of the WE# pulse and
is terminated with the rising edge of the same. Sector
addresses must be held constant during the WE# pulse.
Refer to Figure 1 and Figure 2 for sector protection
algo rith m a nd w ave forms. Re move V ID prior to
removing VCC.
To verify programming of the protection circuitry, the
programming equipment must force VID on address pin
A9 with CE# and OE# at V IL and WE# at VIH. Scanning
the sector addresses on A19–A12 while (A6, A1, A0) =
(VIL, VIH, VIL) will produce 01h at device outputs (DQ0–
DQ7) for a protected sector. In this mode, the lower
order addresses, except for A0, A1, and A6 are don’t
care. Address locations with A1 = VIL are reserved for
Autoselect manufacturer and device codes.
Sector Unprotection
Sectors previously protected may subsequently be
unprotected to accommodate code changes, using the
Sector Unprotect Mode. Prior to initiating a code change
in any previously protected sector all sectors must be
placed into the Sector Protect Mode using the Sector
Protection Algorithm.
To activate sector unprotection, apply V CC = 3.3 V ±
10%; the programming equipment must then force VID
on address pin A9 and control pin OE# (VID = 12 V ± 0.5
V), V IL on CE# and A0, VIH on RESET#, A1, and A6.
The sector addresses on A19–A12 should be set to the
sector to be unprotected. The unprotection mechanism
begins on the falling edge of the WE# pulse and is terminated with the rising edge of the same. Refer to
Figure 3 and Figure 4 for sector unprotection algorithm
and waveforms. Remove VID prior to removing VCC.
Verification of sector unprotection is similar to that for
sector protection. The programming equipment must
force VID on address pin A9 with CE# and OE# at VIL
and WE# at VIH. Scanning the sector addresses on
A19–A12 while (A6, A1, A0) = (V IH , V IH, V IL ) will
produce 00h at device outputs (DQ0–DQ7) for an
unprotected sector. In this mode, the lower order
addresses, except for A0, A1, and A6, are don’t care.
Address locations with A1 = V IL are reserved for
Autoselect manufacturer and device codes.
Note that the temporary sector unprotect procedure can
be found in the Am29BL162C data sheet.
Publication# 22240 Rev: B Amendment/0
Issue Date: March 25, 1999
S U P P L E M E N T
DC CHARACTERISTICS
Parameter
Symbol
Parameter Description
Test Conditions
Min
Max
Unit
VID
Voltage for Autoselect and Sector
Protection
VCC = 3 V
11.5
12.5
V
VIH
Input High Voltage
0.7 x VCC
VCC + 0.3 V
V
VIL
Input Low Voltage
–0.5
0.8
V
VCC
Device Power
3.0
3.6
V
ILIT
High Voltage Input Load Current
35
µA
VCC=VCCmax,
A9, OE# = 12.5 V
AC CHARACTERISTICS
Sector Protect/Unprotect Timing Operations
Parameter Symbol
Standard
Description
All Speed Options
Unit
tACC
Address to Output Delay (Note 1)
Max
120
ns
tOE
Output Enable to Output Delay (Note 1)
Max
28
ns
tVIDR
Voltage Transition Time (Note 2)
Min
500
ns
tWPP1
Write Pulse Width (Note 3)
Min
100
µs
tWPP2
Write Pulse Width (Note 4)
Min
10
ms
tOESP
OE# Setup Time to WE# Active (Note 2)
Min
4
µs
tCSP
CE# Setup Time to WE# Active (Note 2)
Min
4
µs
Voltage Setup Time
Min
4
µs
tST
Notes:
1. If higher performance specifications for t ACC and tOE are required, refer to the Read Operations table in the AC Specifications
section of the Am29BL16xC data sheet.
2. Not 100% tested.
3. These timings are for Sector Protect operation.
4. These timings are for Sector Unprotect operation.
SECTOR PROTECTION/UNPROTECTION VERIFY (HIGH VOLTAGE MODE)
Type
WE#
CE#
OE#
A9
A19–A12
A6
VIH
VIL
VIL
VID
Sector
Addresses*
VIL
Verify Sector Protection
Verify Sector Unprotection
* Refer to the Am29BL162C datasheet for sector address tables.
2
Am29BL162C
VIH
A1
A0
VIH
VIL
DQ7–DQ0 (Hex)
01h
00h
S U P P L E M E N T
Start
Set Up Sector Addr
A19–A12
PLSCNT = 1
VCC = 3.3 V ±10%
Set OE#, A9 = VID;
RESET#, A1 = VIH;
CE#, A6, A0 = VIL;
Activate WE# Pulse
Time Out 100 µs
WE# = VIH
CE#, OE# = VIL
A9 should remain VID
Increment PLSCNT
Read from Sector:
Addr = SA, A1 = VIH,
A0, A6 = VIL,
No
No
Data = 01h?
PLSCNT = 25
?
Yes
Yes
Protect
Another
Sector?
Device Failed
Yes
No
Remove VID from A9
Write Reset Command
Sector Protection
Complete
22240B-1
Figure 1.
Sector Protection Algorithm
Am29BL162C
3
S U P P L E M E N T
A19–A12
SAy
SAx
A0
A1
A6
tST
12 V
tST
A9
tVIDR
tVIDR
12 V
OE#
tOESP
tVIDR
tWPP1
WE#
CE#
tCSP
Data
01h
tOE
RESET#
VCC
SAx = Sector Address for initial sector
SAy = Sector Address for next sector
22240B-2
Figure 2.
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AC Waveforms for Sector Protection
Am29BL162C
S U P P L E M E N T
Start
Protect All Sectors
Refer to Figure 1
PLSCNT = 1
VCC = 3.3 V ±10%
Set OE#, A9 = VID;
RESET#, A1, A6 = VIH;
CE#, A0 = VIL;
Activate WE# Pulse
Increment PLSCNT
Time Out 10 ms
Set OE#, CE# = VIL;
WE# = VIH; A9 = VID
Set Up Sector Addr SA0
A0 = VIL; A1, A6 = V IH
Read Data from Device
No
Data = 00h?
Increment Sector Addr
No
Yes
Sector
Addr =
SA10?
No
PLSCNT
= 1000?
Yes
Device Failed
Yes
Remove V ID from A9
Sector Unprotection
Completed
22240B-3
Figure 3.
Sector Unprotect Algorithm
Am29BL162C
5
S U P P L E M E N T
A19–A12
SA0
SA1
A0
A1
A6
tST
12 V
A9
tVIDR
tST
12 V
OE#
tVIDR
tWPP2
tVIDR
WE#
tOESP
CE#
tACC
tCSP
Data
00h
RESET#
VCC
22240B-4
Figure 4.
AC Waveforms for Sector Unprotect
Trademarks
Copyright © 1999 Advanced Micro Devices, Inc. All rights reserved.
AMD, the AMD logo, and combinations thereof are registered trademarks of Advanced Micro Devices, Inc.
Product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
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Am29BL162C