Motorola Single Board Computer 用户手册
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Functional Description
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Application Note: For Am29DL322C or Am29DL323C, 32Megabit
(4M x 8-Bit/2M x 16-bit) CMOS 3.0 Volt-only Flash Memory.
(4M x 8-Bit/2M x 16-bit) CMOS 3.0 Volt-only Flash Memory.
The Write Protect function provides a hardware method of protecting
certain boot sectors. If the system asserts V IL (low signal) on the
WP#/ACC pin, the device disables the program and erase capability,
independently of whether those sectors were protected or unprotected
using the method described in the Sector/Sector Block Protection and
Unprotection of the AMD datasheet. The two outermost 8Kbyte boot
sectors are the two sectors containing the lowest addresses in a bottom-
boot-configured device, or the two sectors containing the highest addresses
in a top-boot-configured device.
certain boot sectors. If the system asserts V IL (low signal) on the
WP#/ACC pin, the device disables the program and erase capability,
independently of whether those sectors were protected or unprotected
using the method described in the Sector/Sector Block Protection and
Unprotection of the AMD datasheet. The two outermost 8Kbyte boot
sectors are the two sectors containing the lowest addresses in a bottom-
boot-configured device, or the two sectors containing the highest addresses
in a top-boot-configured device.
The aforementioned Motorola implemented device (at the time of this
printing is the only Motorola qualified Flash device used on this product)
is a top-boot device, and as such, the write protected area is in the upper
16KB of each device. And, since Motorola is using 4 devices for the
soldered Flash bank, the write protected region corresponds to the upper
64KB of the soldered Flash memory map. Thus the address range of
$F4FF 0000 to F4FF FFFF is the write protected region when the J16
header is jumpered across pins 2 and 3.
printing is the only Motorola qualified Flash device used on this product)
is a top-boot device, and as such, the write protected area is in the upper
16KB of each device. And, since Motorola is using 4 devices for the
soldered Flash bank, the write protected region corresponds to the upper
64KB of the soldered Flash memory map. Thus the address range of
$F4FF 0000 to F4FF FFFF is the write protected region when the J16
header is jumpered across pins 2 and 3.
If PPCBug tries to write to those write-protected address areas when
pins 2-3 on J16 are set, the command will simply not finish (i.e., erase
sector function stops at $F4FF 0000).
pins 2-3 on J16 are set, the command will simply not finish (i.e., erase
sector function stops at $F4FF 0000).
ECC SDRAM Memory
The MVME5100’s on-board memory and optional memory mezzanines
allow for a variety of memory size options. Memory size can be 64 or
512MB for a total of 1GB on-board and mezzanine ECC memory. The
memory is controlled by the hardware which provides single-bit error
correction and double-bit error detection (ECC is calculated over 72-bits).
allow for a variety of memory size options. Memory size can be 64 or
512MB for a total of 1GB on-board and mezzanine ECC memory. The
memory is controlled by the hardware which provides single-bit error
correction and double-bit error detection (ECC is calculated over 72-bits).
Either 1 or 2 mezzanines can be installed. Each mezzanine will add 1 bank
of SDRAM memory of 256MB. A total of 512MB of mezzanine memory
can be added. Refer to
of SDRAM memory of 256MB. A total of 512MB of mezzanine memory
can be added. Refer to
for more information.