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参数资料
| 型号： | SI2401FS10-EVB |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 15/76页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SI2401 UART INTERFACE |
| 标准包装： | 1 |
| 系列： | ISOmodem® |
| 主要目的： | 电信，调制解调器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | SI2401 |
| 主要属性： | 双路 RJ-11 连接至电话线路，音频连接器 |
| 次要属性： | RS-232，TTL 串行和 USB 接口 |
| 已供物品： | 板，调制解调器，电源 |
| 相关产品： | 336-1095-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC |
| 其它名称： | 336-1167 |
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Si2401
22
Rev. 1.0
The method of transmitting HDLC frames is as follows:
1. After the call is connected, the host should begin
sending the frame data to the Si2401 using the CTS
flow control to ensure data synchronicity.
2. When the frame is complete, the host should simply
stop sending data to the Si2401. Since the Si2401
does not yet recognize the end-of-frame, it expects
an extra byte and asserts CTS as shown in
Figure 4A. If CTS is used to cause a host interrupt,
this final interrupt should be ignored by the host.
3. When the Si2401 is ready to send the next byte, if it
has not yet received any data from the host, it
recognizes this as an end-of-frame, raises CTS,
calculates the final CRC code, transmits the code,
and begins transmitting stop flags.
4. After transmitting the first stop flag, the Si2401
lowers CTS indicating that it is ready to receive the
next frame from the host. At this point, the process
repeats as in Step 1.
The method of receiving HDLC frames is as follows:
1. After the call is connected, the Si2401 searches for
flag data. Then, once the first non-flag word is
detected, the CRC is continuously computed, and
the data is sent across the UART (8-bit data or 9-bit
data mode) to the host after removing the HDLC
zero-bit insertion. The DTE rate of the host must be
at least as high as that of data transmission. HDLC
mode only works with 8-bit data words; the ninth bit
is used only for escape on TXD and end-of-frame
received (EOFR) on RXD.
2. When the Si2401 detects the stop flag, it sends the
last data word in the frame as well as the two CRC
bytes and determines if the CRC checksum
matches. Thus, the last two bytes are not frame data
but are the CRC bytes, which can be discarded by
the host. If the checksum matches, the Si2401
echoes “G” (good). If the checksum does not match,
the Si2401 echoes “e” (error). Additionally, if the
Si2401 detects an abort (seven or more contiguous
ones), it echoes an “A”.
When the “G”, “e”, or “A” (referred to as a frame
result word) is sent, the Si2401 raises the EOFR
(end of frame receive) pin (see Figure 4B). 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 is raised if the byte is a frame result word. To
program this mode, set S0C[3] (9BF) = 1b and
SE0[3] (ND) = 1.
3. When the next frame of data is detected, EOFR is
lowered, and the process repeats at Step 1b.
To summarize, when receiving HDLC frames, the host
begins receiving data asynchronously from the Si2401.
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, the data is valid frame data. If the EOFR pin
(or the ninth bit) is high, the data is a frame result word.
Figure 4. HDLC Timing
B. Frame Receive
A. Frame Transmit
TXD
RXD
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
CRC Byte 2
Stop
Start
Stop
Receive Data
EOFR
(or bit 9)
Si2400 ready for byte 1 of frame N
Note: Figure not to scale.
(CTS used as normal flow control.)
Si2401 detects end of frame N.
Si2401 ready for byte 1
of frame N + 1.
CRC Byte 1
Frame Result Word
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