MB91F467BA datasheet(40/127 Pages) CYPRESS

40 / 127 page

MB91460B Series

Document Number: 002-04608 Rev. *A

Page 39 of 126

9. Embedded Program/Data Memory (Flash)

9.1

Flash features

■ MB91F467BA: 1088 Kbytes (16 × 64 Kbytes + 8 × 8 Kbytes = 8.5 Mbits)

■ MB91F466BA: 832 Kbytes (12 × 64 Kbytes + 8 × 8 Kbytes = 6.5 Mbits)

■ MB91F465BB: 544 Kbytes (8 × 64 Kbytes + 4 × 8 Kbytes = 4.25 Mbits)

■ MB91F464BB: 416 Kbytes (6 × 64 Kbytes + 4 × 8 Kbytes = 3.25 Mbits)

■ Programmable wait states for read/write access

■ Flash and Boot security with security vector at 0x0014:8000 - 0x0014:800F

■ Boot security

■ Basic specification: Same as MBM29LV400TC (except size and part of sector configuration)

9.2

Operation Modes

9.2.1

64-bit CPU mode (available on MB91F467BA/466BA only) :

■ CPU reads and executes programs in word (32-bit) length units.

■ Flash writing is not possible.

■ Actual Flash Memory access is performed in d-word (64-bit) length units.

9.2.2

32-bit CPU mode:

■ CPU reads and executes programs in word (32-bit) length units.

■ Actual Flash Memory access is performed in word (32-bit) length units.

9.2.3

16-bit CPU mode:

■ CPU reads and writes in half-word (16-bit) length units.

■ Program execution from the Flash is not possible.

■ Actual Flash Memory access is performed in word (16-bit) length units.

9.2.4

Flash Memory Mode (External Access to Flash Memory Enabled)

Note: The operation mode of the flash memory can be selected using a Boot-ROM function. The function start address is 0xBF60.

The parameter description is given in the Hardware Manual in chapter 54.6 "Flash Access Mode Switching".

MB91F467BA Datenblatt(PDF) 40 Page - Cypress Semiconductor