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AM29F040B-90EIB Arkusz danych(PDF) 7 Page - Advanced Micro Devices

Numer części AM29F040B-90EIB
Szczegółowy opis  4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory
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Producent  AMD [Advanced Micro Devices]
Strona internetowa  http://www.amd.com
Logo AMD - Advanced Micro Devices

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Am29F040B
7
P R E L I M I NARY
The device enters the CMOS standby mode when the
CE# pin is held at VCC ± 0.5 V. (Note that this is a more
restricted voltage range than VIH.) The device enters
the TTL standby mode when CE# is held at VIH. The
device requires the standard access time (tCE) before it
is ready to read data.
If the device is deselected during erasure or program-
ming, the device draws active current until the
operation is completed.
ICC3 in the DC Characteristics tables represents the
standby current specification.
Output Disable Mode
When the OE# input is at VIH, output from the device is
disabled. The output pins are placed in the high imped-
ance state.
Table 2.
Sector Addresses Table
Note: All sectors are 64 Kbytes in size.
Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification, and sector protection verification,
through identifier codes output on DQ7–DQ0. This
mode is primarily intended for programming equipment
to automatically match a device to be programmed with
its corresponding programming algorithm. However,
the autoselect codes can also be accessed in-system
through the command register.
When using programming equipment, the autoselect
mode requires VID (11.5 V to 12.5 V) on address pin
A9. Address pins A6, A1, and A0 must be as shown in
Autoselect Codes (High Voltage Method) table. In addi-
tion, when verifying sector protection, the sector ad-
dress must appear on the appropriate highest order
address bits. Refer to the corresponding Sector Ad-
dress Tables. The Command Definitions table shows
the remaining address bits that are don’t care. When all
necessary bits have been set as required, the program-
ming equipment may then read the corresponding
identifier code on DQ7–DQ0.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in the Command Defini-
tions table. This method does not require VID. See
“Command Definitions” for details on using the autose-
lect mode.
Sector
A18
A17
A16
Address Range
SA0
0
0
0
00000h–0FFFFh
SA1
0
0
1
10000h–1FFFFh
SA2
0
1
0
20000h–2FFFFh
SA3
0
1
1
30000h–3FFFFh
SA4
1
0
0
40000h–4FFFFh
SA5
1
0
1
50000h–5FFFFh
SA6
1
1
0
60000h–6FFFFh
SA7
1
1
1
70000h–7FFFFh


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