AT49LW040 Datasheet, PDF (1/34 Pages) ATMEL Corporation – 8-megabit and 4-megabit Firmware Hub Flash Memory

Features
• Low Pin Count (LPC) BIOS Device
• Functions as Firmware Hub for Intel 810, 810E, 820, 840 Chipsets
• 8M or 4M Bits of Flash Memory for Platform Code/Data Storage
– Uniform, 64-Kbyte Memory Sectors
– Available in 8M Bits (AT49LW080) and 4M Bits (AT49LW040)
– Automated Byte-program and Sector-erase Operations
• Two Configurable Interfaces
– Firmware Hub (FWH) Interface for In-System Operation
– Address/Address Multiplexed (A/A Mux) Interface for Programming during
Manufacturing
• Firmware Hub Hardware Interface Mode
– 5-signal Communication Interface Supporting x8 Reads and Writes
– Read and Write Protection for Each Sector Using Software-controlled Registers
– Two Hardware Write-protect Pins: One for the Top Boot Sector, One for All Other
Sectors
– Five General-purpose Inputs, GPIs, for Platform Design Flexibility
– Operates with 33 MHz PCI Clock and 3.3V I/O
• Address/Address Multiplexed (A/A Mux) Interface
– 11-pin Multiplexed Address and 8-pin Data Interface
– Supports Fast On-board or Out-of-system Programming
• Power Supply Specifications
– V_CC: 3.3V ± 0.3V
– V_PP: 3.3V and 12V for Fast Programming
• Industry-standard Packages
– (40-lead TSOP or 32-lead PLCC)
Description
The AT49LW080 and the AT49LW040 are Flash memory devices designed to be com-
patible with the Intel 82802AC and the Intel 82802AB Firmware Hub (FWH) devices
for PC-Bios Application. A feature of the AT49LW080/040 is the nonvolatile memory
core. The high-performance memory is arranged in eight (AT49LW040) or sixteen
(AT49LW080) 64-Kbyte sectors (see page 13).
Pin Configurations
PLCC
TSOP
[A7] FGPI1 5
[A6] FGPI0 6
[A5] WP 7
[A4] TBL 8
[A3] ID3 9
[A2] ID2 10
[A1] ID1 11
[A0] ID0 12
[I/O0] FWH0 13
29 IC (V_IL) [IC(V_IH)]
28 GNDa [GNDa]
27 VCCa [VCCa]
26 GND [GND]
25 VCC [VCC]
24 INIT [OE]
23 FWH4 [WE]
22 RFU [RY/BY]
21 RFU [I/O7]
(NC) NC 1
[IC (V_IH)] IC (V_IL) 2
[NC] NC 3
[NC] NC 4
[NC] NC 5
[NC] NC 6
[A10] FGPI4 7
[NC] NC 8
[R/C] CLK 9
[VCC] VCC 10
[VPP] VPP 11
[RST] RST 12
[NC] NC 13
[NC] NC 14
[A9] FGPI3 15
[A8] FGPI2 16
[A7] FGPI1 17
[A6] FGPI0 18
[A5] WP 19
[A4] TBL 20
40 GNDa [GNDa]
39 VCCa [VCCa]
38 FWH4 [WE]
37 INIT [OE]
36 RFU [RY/BY]
35 RFU [I/O7]
34 RFU [I/O6]
33 RFU [I/O5]
32 RFU [I/O4]
31 VCC [VCC]
30 GND [GND]
29 GND [GND]
28 FWH3 [I/O3]
27 FWH2 [I/O2]
26 FWH1 [I/O1]
25 FWH0 [I/O0]
24 ID0 [A0]
23 ID1 [A1]
22 ID2 [A2]
21 ID3 [A3]
[ ] Designates A/A Mux Mode
[ ] Designates A/A Mux Mode
8-megabit and
4-megabit
Firmware Hub
Flash Memory
AT49LW080
AT49LW040
Rev. 1966C–FLASH–03/02
1