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AM29F040-150EEB 数据表(PDF) 7 Page - Advanced Micro Devices

部件名 AM29F040-150EEB
功能描述  4 Megabit (524,288 x 8-Bit) CMOS 5.0 Volt-only, Sector Erase Flash Memory
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM29F040-150EEB 数据表(HTML) 7 Page - Advanced Micro Devices

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Am29F040
7
Table 1.
Am29F040 User Bus Operations
Legend:
L = Logic 0, H = Logic 1, X = Don’t Care. See DC Characteristics for voltage levels.
Notes:
1. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Tables 2 and 4.
2. Refer to Table 3 for valid PD (Program Data) during a write operation.
3. Refer to the section on Sector Protection.
4. WE can be VIL if OE is VIL, OE at VIH initiates the write operations.
Read Mode
The Am29F040 has two control functions which must
be satisfied in order to obtain data at the outputs. CE is
the power control and should be used for device selec-
tion. OE is the output control and should be used to
gate data to the output pins if a device is selected.
Address access time (tACC) is equal to the delay from
stable addresses to valid output data. The chip enable
access time (tCE) is the delay from stable addresses and
stable CE to valid data at the output pins. The output en-
able access time is the delay from the falling edge of OE
to valid data at the output pins (assuming the addresses
have been stable for at least tACC–tOE time).
Standby Mode
The Am29F040 has two standby modes, a CMOS
standby mode (CE input held at VCC ± 0.5 V), when the
current consumed is less than 5
µA; and a TTL standby
mode (CE is held at VIH) when the current required is
reduced to approximately 1 mA. In the standby mode
the outputs are in a high impedance state, independent
of the OE input.
If the device is deselected during erasure or program-
ming, the device will draw active current until the
operation is completed.
Output Disable
With the OE input at a logic high level (VIH), output from
the device is disabled. This will cause the output pins to
be in a high impedance state.
Autoselect
The autoselect mode allows the reading out of a binary
code from the device and will identify its manufacturer
and type. This mode is intended for use by programming
equipment for the purpose of automatically matching the
device to be programmed with its corresponding pro-
gramming algorithm. This mode is functional over the
entire temperature range of the device.
To activate this mode, the programming equipment
must force VID (11.5 V to 12.5 V) on address pin A9.
Two identifier bytes may then be sequenced from the
device outputs by toggling address A0 from VIL to VIH.
All addresses are don’t cares except A0, A1, and A6.
The manufacturer and device codes may also be read
via the command register, for instances when the
Am29F040 is erased or programmed in a system with-
out access to high voltage on the A9 pin. The command
sequence is illustrated in Table 4 (refer to Autoselect
Command section).
Byte 0 (A0 = VIL) represents the manufacturer’s code
(AMD = 01H) and byte 1 (A0 = VIH) the device identifier
code (Am29F040 = A4H). All identifiers for manufac-
turer and device exhibit odd parity with the MSB (DQ7)
defined as the parity bit. See Table 2.
Operation
CE
OE
WE
A0
A1
A6
A9
I/O
Autoselect Manufacturer Code (Note 1)
L
L
H
L
L
L
VID
Code
Autoselect Device Code (Note 1)
L
L
H
H
L
L
VID
Code
Read (Note 4)
L
L
H
A0
A1
A6
A9
RD
Standby
H
XXXXXX
HIGH Z
Output Disable
L
H
H
XXXX
HIGH Z
Write
L
H
L
A0
A1
A6
A9
PD (Note 2)
Verify Sector Protect (Note 3)
L
LHLHL
VID
Code
Autoselect Device Unprotect Code
L
L
H
H
H
L
VID
Code


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