V-Tec AT16/C5 Especificaciones Pagina 27
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- Tabla de contenidos
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
Si2400
Rev. 1.3 27
checksum does not match, the Si2400 echoes “e” (error).
Additionally, if the Si2400 detects an abort (seven or more
contiguous ones), then it will echo an “A”.
When the “G”, “e”, or “A” (referred to as a frame result
word) is sent, the Si2400 raises the EOFR (end of frame
receive) pin (see Figure 10B). The GPIO1 pin must be
configured as EOFR by setting SE4[3] (GPE) =
1
b
. In
addition to using the EOFR pin to indicate that the byte is a
frame result word, if in 9-bit data mode (set S15[0] (NBE) =
1
b
), the ninth bit will be raised if the byte is a frame result
word. To program this mode, set S0C[3] (9BF) = 1
b
and
SE0[3] (ND) =
1
b
.
3. When the next frame of data is detected, EOFR is lowered
and the process repeats at step 1.
To summarize, the host will begin receiving data
asynchronously from the Si2400. When each byte is
received, the host should check the EOFR pin (or the
ninth bit). If the EOFR pin (or the ninth bit) is low, then
the data is valid frame data. If the EOFR pin (or the
ninth bit) is high, then the data is a frame result word.
5.15. Fast Connect
In modem applications that require fast connection
times, it is possible to reduce the length of the
handshake.
If the Si2400 is set up as an answering modem, the
answer tone transmitted by the Si2400 may be
shortened by setting S1E (TATL) = 0x00 and setting
S34 (TASL) to the desired answer tone length. For the
most robust operation, it is recommended that the
answer tone sent by the answering modem be at least
10 msec (S34 (TASL) = 0x06).
If the Si2400 is configured as an originating modem,
setting the No Answer Tone bit (S33[1] [NAT] = 1
b
)
forces the Si2400 to recognize a short answer tone,
thereby reducing the overall connection sequence.
Additional modem handshaking control can be adjusted
through the registers shown in Table 15. These
registers are most useful if the user has control of both
the originating and answer modems.
Figure 11. HDLC Timing
B. Frame Receive
A. Frame Transmit
TXD
RXD
Start Stop
Start
Host begins frame N
Frame N StartStart Stop
Host finished sending frame N
Host begins frame N + 1
CTS
Frame N + 1
CRC Byte 2
Stop
Stop
Start
Start StopReceive Data
EOFR
(or bit 9)
Si2400 ready for byte 1 of frame N
Note: Figure not to scale.
(CTS used as normal flow control.)
Si2400 detects end of frame N.
Si2400 ready for byte 1
of frame N + 1.
CRC Byte 1
Frame Result Word
- Features 1
- Applications 1
- Description 1
- Functional Block Diagram 1
- 2 Rev. 1.3 2
- TABLE OF CONTENTS 3
- 1. Electrical Specifications 4
- Table 2. Loop Characteristics 5
- Table 3. DC Characteristics 6
- Table 4. DC Characteristics 6
- Table 5. AC Characteristics 7
- for K-Grade, T 8
- –40 to 85°C for B-Grade) 8
- = –40 to 85°C for B-Grade) 9
- 10 Rev. 1.3 10
- 3. Bill of Materials 11
- 12 Rev. 1.3 12
- 4. Analog Input/Output 13
- 5. Functional Description 14
- 5.1. Digital Interface 15
- 16 Rev. 1.3 16
- 5.3. Low Power Modes 17
- 5.4. Global DAA Operation 17
- 18 Rev. 1.3 18
- Rev. 1.3 19 19
- 20 Rev. 1.3 20
- 5.6. Loop Current Detection 21
- 5.7. Carrier Detect/Loss 21
- 5.8. Overcurrent Detection 21
- 5.11. PCM Data Mode 23
- Figure 10. Signal Routing 24
- 5.12. Analog Codec 25
- 5.14. V.42 HDLC Mode 26
- 5.15. Fast Connect 27
- Table 16. MCKR Configurations 28
- 6.1. Command Line Execution 29
- 30 Rev. 1.3 30
- 6.4. S-Register Control 31
- 32 Rev. 1.3 32
- 6.5.4. A1 34
- 6.5.5. !2 34
- 6.5.6. !7 34
- Table 19. !7 Parameters 35
- Figure 12. !7 Security Timing 36
- Progress 37
- S19 S1A S1B S16 S17 S18 38
- Table 23. DTMF 39
- 7.1. DSP Registers 40
- SE8 SE6 SE5 41
- DSP Reg. Addr 41
- 7.2. Call Progress Filters 42
- 8. S Registers 43
- 44 Rev. 1.3 44
- Rev. 1.3 45 45
- 46 Rev. 1.3 46
- Rev. 1.3 47 47
- 50 Rev. 1.3 50
- Rev. 1.3 51 51
- 52 Rev. 1.3 52
- Rev. 1.3 53 53
- 54 Rev. 1.3 54
- Rev. 1.3 55 55
- 56 Rev. 1.3 56
- 58 Rev. 1.3 58
- Kissoff Tone Detect Length) 58
- Rev. 1.3 59 59
- 60 Rev. 1.3 60
- Rev. 1.3 61 61
- 62 Rev. 1.3 62
- Rev. 1.3 63 63
- Rev. 1.3 65 65
- 66 Rev. 1.3 66
- Rev. 1.3 69 69
- 70 Rev. 1.3 70
- Rev. 1.3 71 71
- 72 Rev. 1.3 72
- Rev. 1.3 73 73
- 74 Rev. 1.3 74
- Rev. 1.3 75 75
- 76 Rev. 1.3 76
- Rev. 1.3 77 77
- DAA Isolation Barrier 78
- Emissions/Immunity 78
- DC Termination 79
- AC Termination 80
- Ringer Impedance 80
- DTMF Dialing 80
- Pulse Dialing 80
- Billing Tone Detection 80
- Symbol Value 81
- In-Circuit Testing 82
- Compliance Test Commands 83
- Introduction 84
- APPENDIX C—UL1950 3RD EDITION 85
- 9. Pin Descriptions: Si2400 86
- Rev. 1.3 87 87
- 10. Pin Descriptions: Si3015 88
- Receive Input 89
- Filter 2 89
- Pin # Pin Name Description 89
- 11. Ordering Guide 90
- Millimeters 91
- Revision 1.1 to Revision 1.2 92
- Revision 1.2 to Revision 1.3 92
- Rev. 1.3 93 93
- CONTACT INFORMATION 94
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