SM470R1B1M-HT Datasheet, PDF (20/67 Pages) Texas Instruments – 16/32-BIT RISC FLASH MICROCONTROLLER

SM470R1B1M-HT
SPNS155F – SEPTEMBER 2009 – REVISED AUGUST 2012
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memory selects
Memory selects allow the user to address memory arrays (i.e., flash, RAM, and HET RAM) at user-defined
addresses. Each memory select has its own set (low and high) of memory base address registers (MFBAHRx
and MFBALRx) that, together, define the array's starting (base) address, block size, and protection.
The base address of each memory select is configurable to any memory address boundary that is a multiple of
the decoded block size. For more information on how to control and configure these memory select registers, see
the bus structure and memory sections of the TMS470R1x System Module Reference Guide (literature number
SPNU189).
For the memory selection assignments and the memory selected, see Table 5.
Table 5. SM470R1B1M Memory Selection Assignment
MEMORY
SELECT
0 (fine)
1 (fine)
2 (fine)
3 (fine)
4 (fine)
5 (coarse)
6 (coarse)
MEMORY
SELECTED
(ALL INTERNAL)
FLASH/ROM
FLASH/ROM
RAM
RAM
HET RAM
CS[5]/GIOC[3]
CS[6]/GIOC[4]
MEMORY
SIZE ⁽¹⁾
1M
64 K ⁽²⁾
1K
512K x 8 (512KB)
256K x 16
(512KB)
512K x 8 (512KB)
256K x 16
(512KB)
MPU
NO
NO
YES
YES
NO
NO
NO
MSM
YES
YES
YES
YES
NO
NO
NO
MEMORY BASE ADDRESS
REGISTER
MFBAHR0 and MFBALR0
MFBAHR1 and MFBALR1
MFBAHR2 and MFBALR2
MFBAHR3 and MFBALR3
MFBAHR4 and MFBALR4
MCBAHR2 and MCBALR2
STATIC MEM
CTL REGISTER
SMCR1
SMCR5
MCBAHR3 and MCBALR3
SMCR6
(1) x8 refers to size of memory in 8-bits; x16 refers to size of memory in 16-bits.
(2) The starting addresses for both RAM memory-select signals cannot be offset from each other by a multiple of the user-defined block
size in the memory-base address register.
JTAG security module
The B1M device includes a JTAG security module to provide maximum security to the memory contents. The
visible unlock code can be in the OTP sector or in the first bank of the user-programmable memory. For the
B1M, the visible unlock code is in the OTP sector at address 0x0000_01F8.
memory security module
The B1M device also includes a memory security module (MSM) to provide additional security and flexibility to
the memory contents' protection. The password for unlocking the MSM is located in the four words just before
the flash protection keys.
RAM
The B1M device contains 64K-bytes of internal static RAM configurable by the SYS module to be addressed
within the range of 0x0000_0000 to 0xFFE0_0000. This B1M RAM is implemented in one 64K-byte array
selected by two memory-select signals. This B1M configuration imposes an additional constraint on the memory
map for RAM; the starting addresses for both RAM memory selects cannot be offset from each other by the
multiples of the size of the physical RAM (i.e., 64K bytes for the B1M device). The B1M RAM is addressed
through memory selects 2 and 3.
The RAM can be protected by the memory protection unit (MPU) portion of the SYS module, allowing the user
finer blocks of memory protection than is allowed by the memory selects. The MPU is ideal for protecting an
operating system while allowing access to the current task. For more detailed information on the MPU portion of
the SYS module and memory protection, see the memory section of the TMS470R1x System Module Reference
Guide (literature number SPNU189).
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