Motorola M68000 User Manual download pdf (Page 353)

S-Record Output Format

C-2

MC68000 FAMILY PROGRAMMER’S REFERENCE MANUAL

MOTOROLA

When downloading S-records, each must be terminated with a CR. Additionally, an S-record

may have an initial ﬁeld that ﬁts other data such as line numbers generated by some time-

sharing systems. The record length (byte count) and checksum ﬁelds ensure transmission

accuracy.

C.2 S-RECORD TYPES

There are eight types of S-records to accommodate the encoding, transportation, and

decoding functions. The various Motorola record transportation control programs (e.g.

upload, download, etc.), cross assemblers, linkers, and other ﬁle creating or debugging pro-

grams, only utilize S-records serving the programOs purpose. For more information on sup-

port of speciﬁc S-records, refer to the userOs manual for that program.

An S-record format module may contain S-records of the following types:

S0 — The header record for each block of S-records. The code/data ﬁeld may con-

tain any descriptive information identifying the following block of S-records.

Under VERSAdos, the resident linkerOs IDENT command can be used to des-

ignate module name, version number, revision number, and description infor-

mation that will make up the header record. The address ﬁeld is normally zeros.

S1 — A record containing code/data and the 2-byte address at which the code/data

is to reside.

S2 — A record containing code/data and the 3-byte address at which the code/data

is to reside.

S3 — A record containing code/data and the 4-byte address at which the code/data

is to reside.

S5 — A record containing the number of S1, S2, and S3 records transmitted in a par-

ticular block. This count appears in the address ﬁeld. There is no code/data

ﬁeld.

S7 — A termination record for a block of S3 records. The address ﬁeld may optionally

contain the 4-byte address of the instruction to which control is to be passed.

There is no code/data ﬁeld.

S8 — A termination record for a block of S2 records. The address ﬁeld may optionally

contain the 3-byte address of the instruction to which control is to be passed.

There is no code/data ﬁeld.

S9 — A termination record for a block of S1 records. The address ﬁeld may optionally

contain the 2-byte address of the instruction to which control is to be passed.

Under VERSAdos, the resident linkerOs ENTRY command can be used to

specify this address. If this address is not speciﬁed, the ﬁrst entry point speci-

ﬁcation encountered in the object module input will be used. There is no code/

data ﬁeld.

Each block of S-records uses only one termination record. S7 and S8 records are only active

when control is to be passed to a 3- or 4- byte address; otherwise, an S9 is used for termi-

nation. Normally, there is only one header record, although it is possible for multiple header

records to occur.

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Motorola M68000 User Manual Page 353

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