82802AB Datasheet, PDF (3/53 Pages) Intel Corporation – Firmware Hub (FWH)

R
Contents
Intel^® 82802AB/AC Firmware Hub
1.
Architectural Overview ................................................................................................................. 9
1.1. Interface Overview........................................................................................................... 9
1.1.1.
Intel Firmware Hub Interface....................................................................... 10
1.1.2.
Address/Address-Multiplexed Interface ...................................................... 10
1.2. Nonvolatile Flash Memory Core .................................................................................... 10
2.
Pinout Configurations ................................................................................................................. 13
2.1. Pin Descriptions............................................................................................................. 14
3.
Interface Operation Description ................................................................................................. 17
3.1. Read
17
3.2. Write
17
3.3. Output Disable............................................................................................................... 17
3.4. Reset 17
3.5. Operational Effects of Hardware Write-Protect Pins TBL# and WP# ........................... 18
4.
Functional Descriptions.............................................................................................................. 19
4.1. Read Array Command................................................................................................... 21
4.2. Read Identifier Codes Command .................................................................................. 21
4.3. Read Status Register Command................................................................................... 21
4.4. Clear Status Register Command................................................................................... 21
4.5. Block Erase Command ................................................................................................. 22
4.6. Program Command....................................................................................................... 22
4.7. Block Erase Suspend Command .................................................................................. 23
4.8. Program Suspend Comand........................................................................................... 23
4.9. Register Based Locking, General-Purpose Input, and Random Number Generator
Registers
23
4.9.1.
4.9.2.
4.9.3.
T_BLOCK_LK and T_MINUSxx_LK — Block-Locking Registers ............... 25
General-Purpose Input Register ................................................................. 26
4.9.2.1. GPI_REG — General-Purpose Input Register ............................... 26
Random Number Generator Registers ....................................................... 27
4.9.3.1. RNG Hardware Status Register ..................................................... 27
4.9.3.2. RNG Data Status Register ............................................................. 27
4.9.3.3. RNG Data Register......................................................................... 28
4.10. Using the Random Number Generator ......................................................................... 28
4.11. Detecting and Initializing the RNG Device..................................................................... 28
4.11.1.
4.11.2.
4.11.3.
4.11.4.
Detecting the RNG Device .......................................................................... 28
Initializing the RNG Device.......................................................................... 29
Selecting Appropriate FWH IDs and Densities ........................................... 29
Mapping FWH Devices onto Memory Map ................................................. 30
4.11.5. Paging FWH Devices for Greater Than 4 MB of FWH Memory ................. 30
4.11.6. Programming Multiple FWH Devices .......................................................... 30
4.12. CUI Automation Flowcharts........................................................................................... 31
5.
Electrical Specifications ............................................................................................................. 33
5.1. Absolute Maximum Ratings........................................................................................... 33
Datasheet
3