AM29F800BB-55EF Spansion Inc., AM29F800BB-55EF Datasheet - Page 9

• Manufacturer Part Number: AM29F800BB-55EF
• Description: IC, FLASH, 8MBIT, 55NS, TSOP-48
• Manufacturer: Spansion Inc.

Specifications of AM29F800BB-55EF

• Memory Type: Flash
• Memory Size: 8Mbit
• Memory Configuration: 1M X 8 / 512K X 16
• Access Time: 55ns
• Supply Voltage Range: 4.5V To 5.5V
• Memory Case Style: TSOP
• No. Of Pins: 48
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In the standby mode the outputs are in the high imped-
ance state, independent of the OE input.
Output Disable
With the OE input at a logic high level (V
the device is disabled. This will cause the output pins
to be in a high impedance state.
Autoselect
The autoselect mode allows the reading of a binary
code from the device and will identify its manufacturer
and type. This mode is intended for use by program-
ming equipment for the purpose of automatically
matching the device to be programmed with its corre-
sponding programming algorithm. This mode is func-
tional over the entire temperature range of the device.
To activate this mode, the programming equipment
must force V
Two identifier bytes may then be sequenced from the
device outputs by toggling address A0 from V
All addresses are don’t cares except A0, A1, and A6
(see Table 3).
*Outputs 01H at protected sector addresses
(B) – Byte mode
(W) – Word mode
8/18/97
Type
Manufacturer Code—AMD
Am29F800 Device
Sector Protection
Type
Manufacturer Code—AMD
Am29F800
Device
Sector Protection
Am29F800B(B)
Am29F800T(B)
ID
(11.5 V to 12.5 V) on address pin A9.
(W)
(W)
Table 3. Am29F800 Sector Protection Verify Autoselect Codes
Am29F800T
Am29F800B
22D6H
2258H
Code
D6H
01H
58H
01H
Table 4. Expanded Autoselect Code Table
A-1
A-1
DQ
15
0
0
0
0
IH
HI-Z
HI-Z
DQ
), output from
14
Word
Word
Byte
Byte
0
0
0
0
P R E L I M I N A R Y
Am29F800T/Am29F800B
IL
HI-Z
HI-Z
DQ
13
0
1
1
0
to V
A12–A18
Address
Sector
HI-Z
HI-Z
DQ
IH
12
0
0
0
0
X
X
X
.
HI-Z
HI-Z
DQ
11
0
0
0
0
The manufacturer and device codes may also be read
via the command register, for instances when the
Am29F800 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 (see Autoselect Com-
mand Sequence).
Byte 0 (A0 = V
(AMD=01H) and byte 1 (A0 = V
code (Am29F800T = D6H and Am29F800B = 58H for
x8 mode; Am29F800T = 22D6H and Am29F800B =
2258H for x16 mode). These two bytes/words are
given in the table below. All identifiers for manufacturer
and device will exhibit odd parity with DQ7 defined as
the parity bit. In order to read the proper device codes
when executing the Autoselect, A1 must be V
Tables 3 and 4).
The autoselect mode also facilitates the determination
of sector protection in the system. By performing a read
operation at the address location XX02H with the
higher order address bits A12–A18 set to the desired
sector address, the device will return 01H for a pro-
tected sector and 00H for a non-protected sector.
HI-Z
HI-Z
DQ
10
A6
V
V
V
V
0
0
0
0
IL
IL
IL
IL
HI-Z
HI-Z
DQ
9
0
1
1
0
HI-Z
HI-Z
DQ
V
A1
V
V
V
0
0
8
0
0
IL
IH
IL
IL
IL
) represents the manufacturer’s code
DQ
7
0
1
1
0
0
0
DQ
0
6
0
1
1
1
1
V
V
V
A0
V
IH
IH
IL
IL
DQ
5
0
0
0
0
0
0
IH
DQ
) the device identifier
4
0
1
1
1
1
0
DQ
Code (HEX)
0
3
0
0
0
1
1
22D6H
2258H
01H*
01H
D6H
58H
DQ
2
0
1
1
0
0
0
DQ
1
0
1
1
0
0
0
IL
(see
DQ
0
1
0
0
0
0
1
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