Maxim Integrated Secure Microcontroller - Manual (Page 25)

Secure Microcontroller User’s Guide
25 of 187
are selected during the bootstrap loading process and cannot be modified by the application software. The
table below shows the range values that can be selected when PM = 0 (partitionable).
RG1 RG0
RANGE
(kB)
CE1 ACCESS CE2 ACCESS
1 1 64 0000–7FFFh 8000–FFFFh
1 0 32 0000–7FFFh NA
0 1 16 0000–1FFFh 2000h–3FFFh
0 0 8 0000–1FFFh NA
The total RAM space is partitionable, regardless of which range is selected. This contrasts with the
DS5000 that allowed partitioning of
CE1 only (see the following partition table). PA3–0 are the four
MSBs of the MCON register (MCON.7-4). Note that the partition values do not scale depending on
range. That is, if a range of less than 64kB is selected, the partition settings above the range should not be
unused. The microcontroller automatically decodes which RAM to enable, and uses the partition to
decide if this is program memory or data memory.
Partition Table
PA3 PA2 PA1 PA0 PARTITION BYTEWIDE BUS MEMORY MAP
0 0 0 0 0000h 0 Program, Data = Range
0 0 0 1 1000h 4kB Program, Data = Range – 4kB
0 0 1 0 2000h 8kB Program, Data = Range – 8kB
0 0 1 1 3000h 12kB Program, Data = Range – 12kB
0 1 0 0 4000h 16kB Program, Data = Range – 16kB
0 1 0 1 5000h 20kB Program, Data = Range – 20kB
0 1 1 0 6000h 24kB Program, Data = Range – 24kB
0 1 1 1 7000h 28kB Program, Data = Range – 28kB
1 0 0 0 8000h 32kB Program, Data = Range – 32kB
1 0 0 1 9000h 36kB Program, 28kB Data
1 0 1 0 A000h 40kB Program, 24kB Data
1 0 1 1 B000h 44kB Program, 20kB Data
1 1 0 0 C000h 48kB Program, 16kB Data
1 1 0 1 D000h 52kB Program, 12kB Data
1 1 1 0 E000h 56kB Program, 8kB Data
1 1 1 1 FFFFh 64kB Program, 0kB Data
Figure 4-4 illustrates the functional memory map of a DS5001/DS5002 series device in partitionable
mode. Note that any access that does not correspond to a bytewide bus location is routed to the expanded
bus Ports 0 and 2.