PEP Modular Computers 15311, User Manual

Page: 22 / 32

VMEM-F1 Chapter 2 Functional Description
Page 2- 8
© PEP Modular Computers
July 30, 1997
2.3.4 FLASH Page Register
Address: Jumper selected A16 base a HEX 81
Format: Byte
Access: Read and write
Value after Reset: HEX 00
Register Description:
Notes
This register contains the currently used FLASH page, which represents a unique FLASH chip pair. The
VMEM-F1 board that offers 64 MBytes of FLASH memory has 16 pages, starting at page 0 up to page
F HEX.
The VMEM-F1-PB1 (FLASH Extension Module), offering 128 MBytes of FLASH memory has 32 pages,
starting with page 10 HEX up to page 2F HEX.
It is important that the user does not program pages that are not available!
2.4 Addressing the Serial EEPROM
The VMEM-F1 base board, as well as the FLASH Extension Module, is fitted with a serial EEPROM
that stores board specific data. The first half of the 2 kbit device is reserved for production data and the
board ID. The second half is available for the application, for example, to record the number of write
cycles to the various FLASH banks.
The serial EEPROMS are interfaced with the serial EEPROM control register. The timing is completely
software controlled (see below).
Note
For more information on the EEPROM, please refer to the XICOR X25C02 data sheet.
PAG4 PAG5 PAG3
PAG2
0 1 2 3 4 5 6 7
Reserved
Reserved
PAG1
PAG0