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4. 2. 1. Firmware
The reserved firmware range is 8 mbyte.
The firmware memory is 32 bits wide, containing 2 Mbyte from address
1FC00000 to 1FDFFFFF. It consists of 2 devices, 16 bits wide each.
4. 2. 2. Flash EPROM
The reserved Flash firmware range is 4 mbyte.
The Flash memory is 8 bits wide, containing 2 mbyte
and is mapped from 1F400000 – 1F5FFFFF address region.
The Flash memory is the Sector Erase Flash EPROM Am29F016
The 2 Mbytes of data is divided into 32 sectors of 64 Kbytes and
programmed in system.
The Am29F016 memory features hardware sector group protection
disabled by program and divided into eight–four sector groups.:
0–3, 4–7, 8–11, 12–15, 16–19, 20–23, 24–27, and 28–31.
4. 2. 3. Onboard memory
It is possible to install 16, 32, or 64 Mbyte DRAM on board. This RAM has to be en-
abled by setting jumper W3 and is then located in the lowest address space starting with
address 0x0. The installed memory volume must be properly selected by setting of
jumper W5 (see ”Operational settings”).
Layout version H3P2160B supports up to 64 Mbyte on board DRAM.
4. 2. 4. VME bus port
4. 2. 4. 1. Master Port
Special Features
In general the cpu provides as bus master the so called ”extended ad-
dress AM–Code” indicating the validity of all address lines. But there
are two special device code ranges that causes the cpu to escort their bus
activities with the ”standard address AM–Code 3D” or the ”short ad-
dress AM–Code 2D”. These ranges are reserved for VME–Devices that
are incapable of decoding address lines A24 to A31 (standard) or A16 to
A31 (short).
The interrupt vectors of the vme bus can be read by accessing special
vme device codes.
Device Codes
Address
Destination Read/Write
Byte Format
3210
1E9xxxxx
1EA00000
to
1EBFFFFF
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