SC312XDP512F0MPVR datasheet(678/1350 Pages) FREESCALE

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Chapter 18 Memory Mapping Control (S12XMMCV3)

MC9S12XDP512 Data Sheet, Rev. 2.17

678

Freescale Semiconductor

Table 18-21 shows the address boundaries of each chip select and the relationship with the implemented

resources (internal) parameters.

Figure 18-23. Local to Implemented Global Address Mapping (Without GPAGE)

18.4.2.4

XGATE Memory Map Scheme

18.4.2.4.1

Expansion of the XGATE Local Address Map

The XGATE 64 Kbyte memory space allows access to internal resources only (Registers, RAM, and

FLASH). The 2 Kilobyte register address range is the same register address range as for the CPU and the

BDM module (see Table 18-22).

XGATE can access the FLASH in single chip modes, even when the MCU is secured. In expanded modes,

XGATE can not access the FLASH when MCU is secured.

The local address of the XGATE RAM access is translated to the global RAM address range. The XGATE

shares the RAM resource with the CPU and the BDM module (see Table 18-22).

XGATE RAM size (XGRAMSIZE) may be lower or equal to the MCU RAM size (RAMSIZE).

The local address of the XGATE FLASH access is translated to the global address as deﬁned by

Table 18-22.

Example 18-3. is a general example of the XGATE memory map implementation.

Table 18-21. Global Chip Selects Memory Space

Chip Selects

Bottom Address

Top Address

CS3

0x00_0800

0x0F_FFFF minus RAMSIZE1

1 External RPAGE accesses in (NX, EX and ST)

CS2

0x10_0000

0x13_FFFF minus EEPROMSIZE2

2 External EPAGE accesses in (NX, EX and ST)

CS23

3 When ROMHM is set (see ROMHM in Table 18-19) the CS2 is asserted in the space occupied by this

on-chip memory block.

0x14_0000

0x1F_FFFF

CS1

0x20_0000

0x3F_FFFF

CS04

4 When the internal NVM is enabled (see ROMON in Section 18.3.2.5, “MMC Control Register (MMCCTL1))

the CS0 is not asserted in the space occupied by this on-chip memory block.

0x40_0000

0x7F_FFFF minus FLASHSIZE5

5 External PPAGE accesses in (NX, EX and ST)

Table 18-22. XGATE Implemented Memory Space

Internal Resource

$Address

XGATE RAM

XGRAM_LOW = 0x0F_0000 plus (0x1_0000 minus XGRAMSIZE)1

1 XGRAMSIZE is the hexadecimal value of XGATE RAM SIZE in bytes.

XGATE FLASH

XGFLASH_HIGH = 0x78_0000 plus (0xFFFF minus XGRAMSIZE)

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