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536EX Chipset Developer’s Manual 49
Intel Confidential
Data Mode AT COMMANDS
0, 0, 1,
, 0, 0,
0,
Synchronous Access Mode Configuration: controls the manner of operation of the Synchronous Access
Mode in the DCE (if present).
Syntax:
+ESA=[<trans_idle>[,<framed_idle>[,<framed_un_ov>[,<hd_auto>[,<crc_type>[,<nrzi_en>[,<syn1>[,<sy
n2>]]]]]]]]
<trans_idle> specifies the bit sequence transmitted by the DCE when a transmit data buffer underrun
condition occurs, while operating in Transparent sub-Mode.
0 In Transparent sub-Mode, DCE transmits 8-bit SYN sequence on idle. DCE receiver does
not hunt for synchronization sequence
1 In Transparent sub-Mode, DCE transmits 8-bit SYN sequence on idle. DCE receiver hunts
for 8-bit SYN sequence
2 In Transparent sub-Mode, DCE transmits 16-bit SYN sequence on idle. DCE receiver hunts
for 16-bit SYN sequence
<framed_idle> specifies the bit sequence transmitted by the DCE when a transmit data buffer underrun
condition occurs immediately after a flag, while operating in Framed sub-Mode.
0 In Framed sub-Mode, DCE transmits HDLC flags on idle
1 In Framed sub-Mode, DCE transmits marks (ones) on idle
<framed_un_ov> specifies the actions undertaken by the DCE when a transmit data buffer underrun or
overrun condition occurs immediately after a non-flag octet, while operating in Framed sub?Mode.
0 In Framed sub-Mode, DCE transmits abort on underrun in middle of frame
1 In Framed sub-Mode, DCE transmits a flag on underrun in middle of frame, and notifies
DTE of underrun or overrun
<hd_auto> specifies whether or not, in V.34 half duplex operation, additional procedures besides those
specified in clause 12/V.34 shall be performed by the DCE when switching from primary channel to
secondary channel operation, and vice versa.
0 When switching between primary and secondary channel operation in V.34 half duplex, the
DCE only executes those procedures defined in clause 12/V.34
1 When switching between primary and secondary channel operation in V.34 half duplex, the
DCE executes additional procedures as described in 8.8.5 besides those defined in clause
12/V.34
<crc_type> specifies the CRC polynomial used while operating in Framed sub-Mode.
0 CRC generation and checking disabled
1 In Framed sub-Mode, the 16-bit CRC specified in 8.1.1.6/V.42 is generated by the DCE in
the transmit direction, and checked by the DCE in the receive direction
2 In Framed sub-Mode, the 32-bit CRC specified in 8.1.1.6/V.42 is generated by the DCE in
the transmit direction, and checked by the DCE in the receive direction
<nrzi_en> specifies if Non Return to Zero Inverted (NRZI) encoding is to be used by the DCE for transmit
and receive data.
0 NRZI encoding and decoding disabled
1 NRZI encoding enabled in the DCE in the transmit direction, and NRZI decoding enabled in
the DCE in the receive direction
<syn2> specifies the octet value(s) to be used while performing character-oriented framing.
0–255 When <trans_idle>=0, specifies the 8-bit transmit idle sequence to be used by the DCE.
When <trans_idle>=1, specifies the 8-bit synchronization sequence to be used by the DCE.
When <trans_idle>=2, specifies first 8 bits of 16-bit synchronization sequence to be used
by the DCE
<syn1> specifies the octet value(s) to be used while performing character-oriented framing.
0–255 When <trans_idle>=2, specifies last 8 bits of 16-bit synchronization sequence to be used
by the DCE
Table 18. Data Mode Command Descriptions (Continued)
Command Default Description
NOTE: An asterisk (*) denotes the factory-default setting.