Tadpole SPARCbook 3 series, Reference Manual

Page: 141 / 216

MODEM
9-23
S Registers
S41 General Bit Mapped Options
Indicates the status of command options.
Default: 3 (00000011b)
Bits 0 - 1 Compression selection (%Cn)
0 = Disabled (%C0)
1 = MNP5 (%C1)
2 = V.42bis (%C2)
3 = MNP5 and V.42bis (%C2) (default)
Bit 2 Auto retrain
0 = Retrains disabled (%E0) (default)
1 = Retrains enabled (%E)
Bit 3 Modem-to-modem flow control
0 = Disabled (\G0) (default)
1 = Enabled (\G1)
Bit 4 Block mode control (\Ln)
0 = Stream mode (\LO) (default)
1 = Block mode (\L1)
Bit 5-7 Reserved
S41-45 Reserved
S46 Data Compression Control
Controls selection of compression. The following actions are
executed for the given values:
Range: 136 or 138 , Default: 138
S46 = 136 Execute error correction protocol with no
compression
S46 = 138 Execute error correction protocol with no
compression (default)
S48 V.42 Negotiation Action
The V.42 negotiation process determines the capabilities of
the remote modem. However, when the capabilities of the
remote modem are known and negotiation is unnecessary,
this process can be bypassed if so desired.
Range: 0, 7, or 128 if an invalid number is entered, it is
accepted into the S register, but S48 will act as if 128 has
been entered.
S3GX_TRMBook Page 23 Friday, September 19, 1997 11:39 am