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10007175-02 KAT4000 User’s Manual
6-1
Section 6
Memory Configuration
The KAT4000 includes the following memory devices:
• Two banks of NOR Flash (32 MB total) and one bank of socketed Flash (512 KB)
• Up to 1gigabyte of DDR2 Synchronous DRAM (SDRAM)
• Up to 1 gigabyte of NAND Flash
• Two 8-kilobyte banks of non-volatile serial EEPROM memory
BOOT MEMORY CONFIGURATION
The KAT4000 boot default is the 8-bit ROM socket which occupies the physical address
space beginning at FC80,0000. Removing the shunt on jumper JP7, pins 1:2, uses the on-
board Flash as the boot device. Read bit 5 of Jumper Settings register at FC40,0018 (see
Register Map 7-7) for the boot device selection.
Table 6-1: Memory Configuration Jumper
USER FLASH
The KAT4000 supports three independent Flash regions, one socketed and two NOR. The
KAT4000 will boot from either region and is selected by jumper JP7 (1:2); socketed Flash is
the default. User Flash starts at location E000,0000
16
with one megabyte at the base of
Flash reserved for the monitor.
• Two banks of NOR Flash are available, 16 MB each (see
Table 14-3 for memory address
details).
• One bank of socketed Flash in a 32-pin PLCC includes up to 512 kilobytes.
The Flash devices interface to the most significant data bits of the PowerPC data bus. For
example, if the data path is 64 bits wide, the PowerPC data bus is declared as D[0:63],
where D0 is the most significant bit and D63 is the least significant bit. The interface to NOR
flash memory is 16-bits, which uses bits 0 to 15 on the processor data bus.
If booting from user Flash, the processor initially maps one megabyte addressing of Flash
memory (beginning at FFF0,0000
16
) at the top of the address space. When an 8-bit Flash
device is installed in the PLCC socket, it always appears at FC80,0000
16
(and is mirrored at
FFF0,0000
16
when the socket is the boot device).
Jumper: Function: Options:
Default
Configuration:
JP7
pins 1:2
Selects monitor
boot device
Jumper out, User Flash
Jumper in, ROM socket
Jumper in, ROM socket