MAS7838 查看數據表（PDF） - Micro Analog systems

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MAS7838

SYNCHRONOUS TO ASYNCHRONOUS CONVERTER SAC CMOS

Micro Analog systems 

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The MAS7838 requires clock signals in order to function

properly. The synchronous data transfer always

requires the TXC clock. The clock is used internally for:

-shifting data out from the TX buffer (to pin TDO)

-shifting data into the RX buffer (via pin RDI)

-detection of the bit rate in order to adjust the internal

baud rate generator (only if TSL = 1)

DA7838.002

20 September, 2000

The asynchronous data transfer (pins TDI, TDO) is

accomplished by generating an internal timing signal for

the asychronous circuits. This internal timing signal

(16T) is 16 times the TXC bit rate in order to sample the

asynchronous data stream (TDI) at the proper speed.

Timing Circuits

16 x TXC

MAS 7838

TXC

EXTERNALLY GENERATED 16T CLOCK

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The MAS7838 is intended for applications where an

asynchronous and synchronous data source must be

linked together. A typical case appears in a data

modem

where the terminal interface of the modem has been

specified to be asynchronous but the modem data

pump operates in a synchronous fashion.

RS232C

INTERFACE

TXD

RXD

TDI

RDO

MAS9138

TDO

TXC

RDI

RXC

MODEM CIRCUITS

PHONE LINE

5 (9)

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