Motorola MVME2400 Series Instrukcja Obsługi Pobierz pdf (Strona 27)

Preparing the MVME240x Hardware

http://www.mcg.mot.com/literature 1-11

Setting the General-Purpose Software-Readable Header (SRH) Switch(S3)

Switch S3 is an eight pole single-throw switch with software readable

switch settings. These settings can be read as a register at ISA I/O address

$801 (hexadecimal). Each switch pole can be set to either logic 0 or logic

1. A logic 0 means the switch is in the “ON” position for that particular bit.

A logic 1 means the switch is in the “OFF” position for that particular bit.

SRH Register Bit 0 is associated with Pin 1 and Pin 16 of the SRH, and

SRH Register Bit 7 is associated with Pin 8 and Pin 9 of the SRH. The SRH

is a read-only register.

If Motorola’s PowerPC firmware, PPCBug, is being used, it reserves all

bits, SRH0 to SRH7. If it is not being used, the switch can be used for other

applications.

Figure 1-2. General-Purpose Software-Readable Header

System Controller Disabled

Automatic System Controller

(factory configuration)

System Controller Enabled

SRH0 = 0

SRH1 = 0

SRH2 = 0

SRH3 = 0

SRH4 = 0

SRH5 = 0

SRH6 = 0

SRH7 = 0

SRH0 = 1

SRH1 = 1

SRH2 = 1

SRH3 = 1

SRH4 = 1

SRH5 = 1

SRH6 = 1

SRH7 = 1

ON ON

16 16

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1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 177 178

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Motorola MVME2400 Series Instrukcja Obsługi Strona 27