參數(shù)資料
型號(hào)： SI2400-FS
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 20/94頁(yè)
文件大?。?/td> 0K
描述： IC ISOMODEM SYST-SIDE DAA 16SOIC
標(biāo)準(zhǔn)包裝： 48
系列： ISOmodem®
數(shù)據(jù)格式： V.21，V.22，V.23，Bell 103，Bell 212A
波特率： 2.4k
電源電壓： 3 V ~ 5.25 V
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 管件
配用： 336-1166-ND - BOARD EVAL FOR SI2400 ISOMODEM
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) =
1b. 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) =
1b), the ninth bit will be raised if the byte is a frame result
word. To program this mode, set S0C[3] (9BF) =
1b and
SE0[3] (ND) =
1b.
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] = 1b)
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
These
registers are most useful if the user has control of both
the originating and answer modems.
Figure 11. HDLC Timing
B. Fram e Receive
A. Fram e Transm it
TXD
RX D
Start
Stop
Start
Host begins frame N
Frame N
Start
Stop
Host finished sending frame N
Host begins frame N + 1
CTS
Frame N + 1
C RC Byte 2
Stop
Start
Stop
Receive Data
EO FR
(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 W ord
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參數(shù)描述
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SI2401 制造商:SILABS 制造商全稱:SILABS 功能描述:V.22BIS ISOMODEM㈢ WITH LOW-COST DAA
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