Maxim Integrated Teridian V.22 bis Linux Softmodem for 73M1822/73M1922 MicroDAA - Manual (Page 48)

V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide UG_1x22_043
48 Rev. 1.5
S22 General Modem Status Register 3

54 See following
Bit 2 Bit 1 Bit 0 Synchronous/Asynchronous control
0 0 0 Y0 Asynchronous mode
0 0 1 Y1 Synchronous mode
1 0 0 Y4 Pseudo-synchronous mode
 1 1 0 Y6 Asynchronous with speed buffering
Bit 6 Bit 5 Bit 4 Bit 3 Select result codes
0 0 0 1 X0 Enable Result Codes 0-4.
0 0 0 0 X1 Enable Result Codes 0-5, 10.
0 0 1 0 X2 Enable Result Codes 0-6, 10.
0 1 0 0 X3 Enable Result Codes 0-5, 7, 10.
 0 1 1 0 X4 Enable Result Codes 0-7, 10. (Default)
1 0 0 0
X5 Enable Result Codes 0-5, 10, and detect
BUSY at OFF HOOK.
1 0 1 0
X6 Enable Result Codes 0-6, 10, and detect
BUSY at OFF HOOK.
1 1 0 0
X7 Enable Result Codes 0-5, 7, 10, and
detect BUSY at OFF HOOK.
1 1 1 0
X8 Enable Result Codes 0-7, 10, and detect
BUSY at OFF HOOK.
 Bit 7 0 Pulse dialing make/break ration = 39/61
1 Pulse dialing make/break ration = 33/67
S26 Data Mode Control Register
 0 See following
Bit 0 Forces rate change to 1200bps
 Bit 1 0 Disables speed negotiation during a retrain request
1 Enables speed negotiation during a retrain request
 Bit 2 0 Disables automatic retrain requests
1 Enables an automatic retrain request to be negotiated
 Bit 3 0 Disables retrain request response
1 Enables the modem to respond to a retrain request