ISD94100 Series Technical Reference Manual
Sep 9, 2019
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AHB Slave Interface
There are two AHB slave interfaces in the flash memory controller, one is from both Cortex
®
-M4
I-Bus and D-Bus for instruction and data fetch; the other is from Cortex
®
-M4 S-Bus for flash
control registers access, including ISP registers.
Cache Memory Controller
A 4 KB cache memory with zero wait cycle is implemented between the Cortex
®
-M4 CPU and
embedded flash memory. This cache memory improves the flash access performance and
reduces power consumption of the embedded flash memory.
Flash Control Registers
All of ISP control and status registers are in the flash control registers. The detailed register
description follows.
Flash Initialization Controller
When chip is powered-on or resumes active from reset, the flash initialization controller will start
to access flash automatically and check the flash stability, it then reloads the User Configuration
content to the flash control registers for system initialization.
Flash Operation Controller
The flash operations, such as flash erase, flash program, and flash read operation, have specific
control timings for embedded flash memory. The flash operation controller generates these
control timings for operations requested from the cache memory controller, the flash control
registers and the flash initialization controller.
Embedded Flash Memory
The embedded flash memory is the main memory for user application code and parameters. It is
consists of the user configuration block, 4 KB LDROM and 512 KB APROM with Data Flash. The
page erase flash size is 4 KB, and minimum program bit size is 32 bits.
Содержание ISD94100 Series
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