收藏本站
参数资料
型号： SCD223110QCD
厂商： INTEL CORP
元件分类： 微控制器/微处理器
英文描述： 2 CHANNEL(S), 256K bps, SERIAL COMM CONTROLLER, PQFP100
封装： METRIC, QFP-100
文件页数： 151/178页
文件大小： 2247K
代理商： SCD223110QCD
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
74
Datasheet
6.4.1
Framing
An MNP4 (V.42) frame consists of a start flag, data octets, a stop flag, and a 16-bit FCS (frame
check sequence). The FCS uses the polynomial (
), preset to all ‘1’s, transmitted,
and inverted. The character format uses asynchronous framing with 8 data bits, no parity, and one
Stop bit. In-band flow control (XON/XOFF) is not permitted in this mode.
The start flag is a three octet sequence consisting of the start character, escape character, and STX
(0x02). The stop flag is a two octet sequence consisting of the escape character and ETX (0x03).
During transmit, if an escape character is encountered in the data stream, it is duplicated.
Conversely, the receiver discards the second of two sequential escape characters.
MNP4 is the data-link layer of ARAP 1.0 (AppleTalk
Remote Access Protocol). ARAP 2.0 is the
same as MNP4 except for the two start and escape characters.
The CD2231 uses two Special Character registers (SCHR1 and SCHR2) to hold the definition of
the start and escape characters. There is no mode selection within the CD2231 that allows it to
determine whether it is in an ARAP 1.0 or ARAP 2.0 environment. It builds and detects frames
using the values in the two Special Character registers. The user must load the two Special
Character registers with the appropriate start and escape characters for the version in use during
channel initialization. The two special characters for each protocol are shown in Table 12.
For both versions of ARAP, frames begin with SCHR1, SCHR2, STX, and end with SCHR2 and
ETX:
ARAP 1.0— SYN, DLE, STX, data, data, data, ... DLE, ETX
ARAP 2.0— SOH, ESC, STX, data, data, data, ... ESC, ETX
Both versions escape the escape character (in SHCR2) by duplicating it if it appears within the data
stream.
6.4.2
MNP4/ARAP FCS (Frame Check Sequence) Calculation
Both versions use the (
) polynomial, preset to all ‘1’s, transmitted and inverted
with remainder equal to 0x1D0F. The frame body and ETX octet of the stop flag are included in the
FCS calculation for both versions. The start flag and all DLE (ARAP 1.0)/ESC (ARAP 2.0) octets
that are used for transparency are excluded from the FCS calculation. Figure 17 and Figure 18
illustrate the characters used in the FCS calculation. Data used in FCS calculation is in bold print.
x
16
x
12
x
5
1
++
+
Table 12. Special Character Definition
Special Character
Register 1 and 2
ARAP 1.0
ARAP 2.0
SCHR1 contains the start
character
SYN
SOH
SCHR2 contains the escape
character
DLE
ESC
x
16
x
12
x
5
1
++
+
Figure 17. ARAP 1.0 Frame
Start Flag
T
End Flag
SYN
DLE
STX
data
DLE
DLE
data
DLE
ETX
FCS1
FCS2
相关PDF资料
PDF描述
SCDV5540 5X5 DOT MATRIX DISPLAY, RED, 3.2 mm
SCDV5541 5X5 DOT MATRIX DISPLAY, YELLOW, 3.2 mm
SCDV5543 5X5 DOT MATRIX DISPLAY, GREEN, 3.2 mm
SCF5249LAG120 32-BIT, 120 MHz, RISC PROCESSOR, PQFP144
SCF5250CAG120 32-BIT, 120 MHz, MICROPROCESSOR, PQFP144
相关代理商/技术参数
参数描述
SCD224K122A324F 制造商:Cornell Dubilier Electronics 功能描述:FILM CAPACITOR
SCD224K122A3Z25 制造商:Cornell Dubilier Electronics 功能描述:Cap Film 0.22uF 1200V PP 10% (46.99 X 24.6 X 24.1mm) Screw Mount
SCD224K122A3Z25-F 功能描述:薄膜电容器 1200Vdc .22uF 580Vac RoHS:否 制造商:Cornell Dubilier 产品类型: 电介质:Polyester 电容:0.047 uF 容差:10 % 电压额定值:100 V 系列:225P 工作温度范围:- 55 C to + 85 C 端接类型:Radial 引线间隔:9.5 mm
SCD224K162A3-24 制造商:Cornell Dubilier Electronics 功能描述:FILM CAPACITOR
SCD224K162A324F 制造商:Cornell Dubilier Electronics 功能描述:FILM CAPACITOR
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*