Motorola PowerQUICC II MPC8280 Series Reference Manual page 241

Table 5-5. RSTCONF Connections in Multiple-MPC8280 Systems
Configuration master
First configuration slave
Second configuration slave
Third configuration slave
Fourth configuration slave
Fifth configuration slave
Sixth configuration slave
Seventh configuration slave
The configuration words for all MPC8280s are assumed to reside in an EPROM connected
to CS0 of the configuration master. Because the port size of this EPROM is not known to
the configuration master, before reading the configuration words, the configuration master
reads all configuration words byte-by-byte only from locations that are independent of port
size.
Table 5-6. shows addresses that should be used to configure the various MPC8280s. Byte
addresses that do not appear in this table have no effect on the configuration of the
MPC8280 chips. The values of the bytes in Table 5-6 are always read on byte lane D[0–7]
regardless of the port size
.
Table 5-6. Configuration EPROM Addresses
Configured Device
Configuration master
First configuration slave
Second configuration slave
Third configuration slave
Fourth configuration slave
Fifth configuration slave
Sixth configuration slave
Seventh configuration slave
The configuration master first reads a value from address 0x00 then reads a value from
addresses 0x08, 0x10, and 0x18. These four bytes are used to form the configuration word
of the configuration master, which then proceeds reading the bytes that form the
configuration word of the first slave device. The configuration master drives the whole
configuration word on D[0–31] and toggles its A0 address line. Each configuration slave
uses its RSTCONF input as a strobe for latching the configuration word during HRESET
assertion time. Thus, the first configuration slave whose RSTCONF input is connected to
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Configured Device
Byte 0 Address
0x00
0x20
0x40
0x60
0x80
0xA0
0xC0
0xE0
Chapter 5. Reset
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RSTCONF Connection
GND
A0
A1
A2
A3
A4
A5
A6
Byte 1 Address Byte 2 Address
0x08 0x10
0x28 0x30
0x48 0x50
0x68 0x70
0x88 0x90
0xA8 0xB0
0xC8 0xD0
0xE8 0xF0
Reset Configuration
Byte 3 Address
0x18
0x38
0x58
0x78
0x98
0xB8
0xD8
0xF8
5-7