参数资料
型号: PEF2080
厂商: SIEMENS AG
英文描述: S/T Bus Interface Circuit(SBC)
中文描述: S / T的总线接口电路(SBC)的
文件页数: 21/74页
文件大小: 2620K
代理商: PEF2080
Semiconductor Group
22
Functional Description
The basic frame consists of a total of 32 bits, or four octets: B1 + B2 + D (18 bits) plus 14 bits of
MONITOR and control information. The data in both directions are synchronous and in phase
(
figure 8
).
Figure 8
IOM
Interface Frame Structure
1st octet B1:
2nd octet B2
3rd octet:
4th octet B*:
B channel (64 kbit/s), most significant bit first
-”-
MONITOR channel (64 kbit/s) -”-
2-bit D channel (16 kbit/s)
4-bit C/I channel
T channel: not used with SBC
E bit: not used with SBC.
-”-
The C/l channel is used for communication between the SBC and a processor via a layer-2 device,
to control and MONITOR layer-1 functions. The codes originating from layer-2 devices are called
“commands”, those sent by the SBC are called “indications”. For a list of the C/l codes and their use,
refer to chapter 4.
Three modes of the lOM are distinguished. These modes differ only with respect to the physical data
rate (256 or 8 x 256 kbit/s) and to polarity of the clocks.
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