Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

480

Order Number: 330061-002US

• Reads, writes, and erases are all supported.
• Program register access uses hardware or software sequencing. See 

 for further information.

• Program register accesses are not allowed to cross a 4-KB boundary and do not 

issue a command that extends across two components.

• The software programs the FLA corresponding to the region desired.

— The software must read the devices primary region base/limit address to create 

an FLA.

Each internal initiator accesses the Flash through a set of memory-mapped registers 

that are dedicated to each Flash device.

The software uses two separate control and status registers when using program 

register access to the Flash. The hardware sequencing control/status registers rely on 

the hardware to issue the appropriate Flash instructions and atomic sequences. The 

software sequencer puts control into the hands of the software for what instructions to 

issue and when.

The goal is to support all Flash components through hardware sequencing. Software 

sequencing is intended only as a back-up strategy.

Software sequencing is required when operating in a non-descriptor mode.

• Only the CPU core running the BIOS accesses the registers.
• Using the protected range registers, the BIOS adds separate read/write protection 

above that granted in the Flash Descriptor for its own accesses.

— For example, the BIOS wants to protect different regions of the BIOS from 

being erased.

— Ranges extend across region boundaries.