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Product identity values

These are values returned by the

lddevid and ldprodid instructions. For specific

product ids in the ST20 family refer to SGS-THOMSON.

1.10 Operators used in the definitions

Modulo operators

Arithmetic on addresses is done using

modulo arithmetic — i.e. there is no checking

for errors and, if the calculation overflows, the result ‘wraps around’ the range of

values representable in the word length of the processor — e.g. adding 1 to the

address at the top of the address map produces the address of the byte at the bottom

of the address map. There is also a number of instructions for performing modulo

arithmetic, such as

sum, prod, etc. These operators are represented by the symbols

‘

+’, ‘−’, etc.

Name

Value

Meaning

DeviceId

Depends on pro-

cessor type. See

below.

A value used to identify the type and revision of processor.

Returned by the

ldprodid and lddevid instructions.

Disabling.p

MostNeg + #03

#80000003

Stored in the pw.State location while an alternative is being

disabled.

Enabling.p

MostNeg + #01

#80000001

Stored in the pw.State location while an alternative is being

enabled.

false

0 The boolean value ‘false’.

NoneSelected.o

-1

#FFFFFFFF

Stored in the pw.Temp slot of a process’ workspace while no

branch of an alternative has yet been selected during the

waiting and disabling phases.

NotProcess.p

MostNeg

#80000000

Used, wherever a process descriptor is expected, to indicate

that there is no process.

Ready.p

MostNeg + #03

#80000003

Stored in the pw.State location during the enabling phase of

an alternative, to indicate that a guard is ready.

TimeNotSet.p

MostNeg + #02

#80000002

Stored in pw.TLink location during enabling of a timer alter-

native after a time to wait for has been encountered.

TimeSet.p

MostNeg + #01

#80000001

Stored in pw.TLink location during enabling of a timer alter-

native after a time to wait for has been encountered.

true

1 The boolean value ‘true’.

Waiting.p

MostNeg + #02

#80000002

Stored in the pw.State location by

altwt and taltwt to indicate

that the alternative is waiting.

HighPriority

0 High priority

LowPriority

1 Low priority

Table 1.6 Constants used within the ST20

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