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MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

5-7

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

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

configuration master’s A0 output latches the word driven on D[0–31] as its configuration word. In this way

the configuration master continues to configure all MPC8280 chips in the system. The configuration

master always reads eight configuration words regardless of the number of MPC8280 parts in the system.

Table 5-5. RSTCONF Connections in Multiple-MPC8280 Systems

Configured Device

RSTCONF Connection

Configuration master

GND

First configuration slave

Second configuration slave

Third configuration slave

Fourth configuration slave

Fifth configuration slave

Sixth configuration slave

Seventh configuration slave

Table 5-6. Configuration EPROM Addresses

Configured Device

Byte 0 Address

Byte 1 Address

Byte 2 Address

Byte 3 Address

Configuration master

0x00

0x08

0x10

0x18

First configuration slave

0x20

0x28

0x30

0x38

Second configuration slave

0x40

0x48

0x50

0x58

Third configuration slave

0x60

0x68

0x70

0x78

Fourth configuration slave

0x80

0x88

0x90

0x98

Fifth configuration slave

0xA0

0xA8

0xB0

0xB8

Sixth configuration slave

0xC0

0xC8

0xD0

0xD8

Seventh configuration slave

0xE0

0xE8

0xF0

0xF8

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