Specifications

HW400p/M Technical Reference - 1.0, March 6, 2002 High-Density Flash 39
5-3. High-Density Flash
The HW400p/M supports up to 16 Mbytes of high-density Flash via the
8245’s Expanded ROM interface. This memory utilizes a 16-bit data bus. Bits
in the General Purpose Register (see General Purpose Register (GPR) on page
49) provide information about the size of each device and number of devices.
Bits NVSIZ[2:0] specifies the size of each device and bit NVDEV specifies the
number of devices.
Table 5-4 shows the various possibilities for the high-density Flash. For a given
total high-density memory size, the high-density Flash occupies a contiguous
memory block (starting at 0x7800 000 in MPC8245’s local address space)
regardless of the number of devices used. However when two devices are
used, the device boundary must be considered during programming. The
standard configuration for HW400p/M is 8Mbytes. The 64Mbit Flash device is
currently unavailable, as shown in gray on the table.