AT49LH002-33JC Atmel, AT49LH002-33JC Datasheet - Page 20

• Manufacturer Part Number: AT49LH002-33JC
• Description: IC FLASH 2MBIT 33MHZ 32PLCC
• Manufacturer: Atmel

Specifications of AT49LH002-33JC

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 2M (256K x 8)
• Speed: 33MHz
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Multiple Device
Selection
20
AT49LH002
Table 15. General-purpose Input Register
When used as a FWH device along with Intel chipsets, multiple FWH devices may be used in
a system to increase the overall memory density. By using the four ID strapping pins, ID[3:0],
up to 16 FWH devices may be attached to the same bus. BIOS support, bus loading, or the
attaching bridge may limit the actual number of devices that can be connected to the bus.
The boot device must have ID[3:0] equal to 0000b, and all subsequent devices should use
sequential up-count strapping. The strapping values on ID[3:0] must match the values in the
IDSEL field when performing FWH memory cycles. The device will compare the values on the
ID[3:0] pins with the IDSEL field. If there is a mismatch, the device will ignore the remainder of
the cycle. The device will then enter standby mode when the FWH4/LFRAME pin is high and
no internal operation is in progress. The FWH/LAD[3:0] pins will also be placed in a high-
impedance state.
Table 16. FWH Multiple Device Selection
0 (Boot Device)
Bit
7:5
4
3
2
1
0
Device
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
GPI_REG4
GPI_REG3
GPI_REG2
GPI_REG1
GPI_REG0
Reserved
Name
ID3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Description
Reserved for future use.
ID2
0
1
0
1
0
1
0
1
0
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
ID Strapping Pins
GPI4 input pin is at V
GPI4 input pin is at V
GPI3 input pin is at V
GPI3 input pin is at V
GPI2 input pin is at V
GPI2 input pin is at V
GPI1 input pin is at V
GPI1 input pin is at V
GPI0 input pin is at V
GPI0 input pin is at V
ID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
IL
IH
IL
IH
IL
IH
IL
IH
IL
IH
.
.
.
.
.
.
.
.
.
.
ID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
3377B–FLASH–9/03
IDSEL
0000b
0001b
0010b
0011b
0100b
0101b
0110b
0111b
1000b
1001b
1010b
1011b
1100b
1101b
1110b
1111b