參數(shù)資料
型號: SAB82525H
廠商: INFINEON TECHNOLOGIES AG
英文描述: Data Communications ICs
中文描述: 數(shù)據(jù)通信集成電路
文件頁數(shù): 105/126頁
文件大小: 730K
代理商: SAB82525H
Semiconductor Group
105
SAB 82525
SAB 82526
SAF 82525
SAF 82526
Defines the function of the transmit data pins (T
×
DA, T
×
DB)
0. . .T
×
D pins are open drain outputs
1. . .T
×
D pins are push-pull outputs
ODS … Output Driver Select
The function of this bit depends on the selected serial port configuration (bit SC0)
Point-to-point configurations: ITF
Determines the idle (= no data to send) state of the transmit data pins (T
×
DA, T
×
DB)
0 … Continuous IDLE sequences are output (T
×
D pins remain in the "1" state)
1 … Continuous FLAG sequences are output ("01111110" bit patterns)
ITF/OIN … Interframe Time Fill/One Insertion
Bus configurations: OIN
In bus configurations, the ITF is implicitly set to 0, i.e. continuous "1"s are transmitted,
and data encoding is NRZ!
When this bit is set, a "ONE" insertion (deletion) mechanism is activated, inserting a "1"
after seven consecutive "0"s in the transmit data stream or deleting a "1" in the receive
data stream.
Similar to the HDLC’s bit-stuffing mechanism (inserting a "0" after five consecutive "1"s),
this method proves to be advantageous when the receive clock is recovered from the
receive data stream by means of DPLL, because it is guaranteed that at least after seven
bits a transition occurs in the receive data in case of long "0" sequences!
CM2, CM1, CMO … Clock Mode
Selects one of the 8 different clock modes
000
clock mode 0
.
.
.
.
.
.
111
clock mode 7
Since in time-slot oriented systems the T
×
D pin is not tristated automatically out of the
programmed time-slot, the T
×
D pin should be configured as open drain in time-slot
oriented bus systems.
Note:
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