L6364 datasheet(25/60 Pages) STMICROELECTRONICS

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Table 23. Receive M-sequence lengths

CKT:M-seq.type [7:6]

Received M-Sequence length

READ,

MC:R/W = '1'

WRITE,

MC:R/W = '0'

Type 0

2 octet

3 octet

Type 1

2 octet

2 octet + f(OD1)*

Type 2

M2CNT

M2CNT+ f(OD2)

f(OD1), f(OD2) and M2CNT are used to configure the L6364 for M-Sequence reception and are configured

through register MSEQ as follows:

•

f(OD1), f(OD2): defines the received number of on-demand octets, where support is only provided for

data widths of 1, 2 and 8 octets and not 32. The values are determined from MSEQ:OD1[1:0] for type 1

sequences and MSEQ:OD2[1:0] for type 2 sequences according to Table 24.

Table 24. Permissible values of MSEQ:OD1 and MSEQ:OD2

MSEQ:OD1[1:0]

f(OD1) (On-demand data)

MSEQ:OD2[1:0]

f(OD2) (On-demand data)

Illegal(*)

1 octet

2 octet

8 octet

•

M2CNT: defines the expected octet count on a read operation. Its value corresponds to the value of field

MSEQ:M2CNT[3:0]

The total data buffer size is 15 octets. If an M-sequence of a length greater than this is required for reception or

transmission, then the single octet access mode should be used (see Section 8.2 ).

(*)A setting of MSEQ:OD1[1:0]=00 is used for backwards compatibility. In this case M2CNT + f(OD2) defines the

length of received type 1 M-sequences.

L6364

M-sequence interpretation

DS13363 - Rev 4

page 25/60

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