参数资料
型号: RM48L950PGET
厂商: TEXAS INSTRUMENTS INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 200 MHz, RISC MICROCONTROLLER, PQFP144
封装: GREEN, PLASTIC, LQFP-144
文件页数: 131/154页
文件大小: 2807K
代理商: RM48L950PGET
PRODUCTPREVIEW
SPNS174
– SEPTEMBER 2011
4.10.2 Main Features of Flash Module
Support for multiple flash banks for program and/or data storage
Simultaneous read access on a bank while performing program or erase operation on any other bank
Integrated state machines to automate flash erase and program operations
Software interface for flash program and erase operations
Pipelined mode operation to improve instruction access interface bandwidth
Support for Single Error Correction Double Error Detection (SECDED) block inside Cortex-R4F CPU
– Error address is captured for host system debugging
Support for a rich set of diagnostic features
4.10.3 ECC Protection for Flash Accesses
All accesses to the program flash memory are protected by Single Error Correction Double Error Detection
(SECDED) logic embedded inside the CPU. The flash module provides 8 bits of ECC code for 64 bits of
instructions or data fetched from the flash memory. The CPU calculates the expected ECC code based on
the 64 bits received and compares it with the ECC code returned by the flash module. A signle-bit error is
corrected and flagged by the CPU, while a multi-bit error is only flagged. The CPU signals an ECC error
via its Event bus. This signaling mechanism is not enabled by default and must be enabled by setting the
"X" bit of the Performance Monitor Control Register, c9.
MRC p15,#0,r1,c9,c12,#0
;Enabling Event monitor states
ORR r1, r1, #0x00000010
MCR p15,#0,r1,c9,c12,#0
;Set 4th bit (‘X’) of PMNC register
MRC p15,#0,r1,c9,c12,#0
The application must also explicitly enable the CPU's ECC checking for accesses on the CPU's ATCM
and BTCM interfaces. These are connected to the program flash and data RAM respectively. ECC
checking for these interfaces can be done by setting the B1TCMPCEN, B0TCMPCEN and ATCMPCEN
bits of the System Control coprocessor's Auxiliary Control Register, c1.
MRC p15, #0, r1, c1, c0, #1
ORR r1, r1, #0x0e000000
;Enable ECC checking for ATCM and BTCMs
DMB
MCR p15, #0, r1, c1, c0, #1
4.10.4 Flash Access Speeds
For information on flash memory access speeds and the relevant wait states required, refer to Section 3.4.
78
System Information and Electrical Specifications
Copyright
2011, Texas Instruments Incorporated
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