參數(shù)資料
型號： ST75C540FP-A
廠商： 意法半導體
英文描述： SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES
中文描述： 超級綜合DEVICESWITH數(shù)字信號處理器，模擬前端
文件頁數(shù)： 66/84頁
文件大?。?/td> 599K
代理商： ST75C540FP-A
Theseflowchartsshowtwo CPU variableslabeled
IBUF and Tx_Completed, they are necessary for
the understandingof the mechanism, but there is
differentmanners to implement it. Thesetwo vari-
ables have the following meanning :
- IBUF:Thisisthenumberof theDUALRAMBuffer
currently in use by the Host processor. It starts
with 0 andthen alternate1, 0, 1, 0, ...
- Tx_Completed : This is a Flag to dialog with the
interrupt process in order to stop properly the
transmition.
The other Buffers are sent under interrupt control
(refer to the interrupt flow chart,Figure 30).
To stop properly the transmition, without loss of
Data(see Figure31).
XI- TRANSMITTING DATA IN PARALLEL MODE
(continued)
RETURN
EXECUTE_IT_TRANSMIT
No
Yes
Tx_COMPLETED
No
Yes
IBUF = 1
WRITE AA, 55, ...
INTO DTTBF1
WRITE 08 INTO DTTBS1
IBUF = 0
WRITE AA, 55, ...
INTO DTTBF0
WRITE 08 INTO DTTBS0
IBUF = 1
(1)
(1)
7
Figure 30
XMIT 00
STOP
Tx_COMPLETED = TRUE
No
Yes
STA_106 = 1
Stop sending parallel
data (delayed)
Stop signal
Semaphore with interrupt
Wait until last buffer is
transmitted and CCITT
stop sequence completed
7
Figure 31
XI.4- ErrorDetection
Error occurs when the ST75C530/540 need some
bitsfromthetransmitbuffer
DTTBSx
andthisbuffer
is empty. This conditionis called “Underflow”.
This error is signaled in the bit
ERR_TX
of the
SYSERR
byte, and generates an interrupt
IT0
. To
cleartheerrora
CSE01
commandmustbe issued.
An Underflow contitionoccurs when :
- In synchronous mode: the host processor “for-
gets” to feed the current
DTTBSx
buffer.
- In HDLC mode: when, while inside a frame, the
host processor “forgets” to feed the current
DTTBSx
buffer.An abort frame is transmitted in
place of the regular Buffer.
- This condition cannotappend in UART mode.
When an underflow conditionoccur the host must
restartthewholeparallelinitialization,asexplained
above.
XI.5 - SynchronousMode
XI.5.1 - Description
InsynchronousmodetheST75C530/540transmits
the bitscontainedin the DUALRAM Bufferwithout
any modification. It starts with the Bit 0 of the
DTTBF0[0]
byte.
XI.5.2 - Status Word Format
The Transmit Status Bytes
DTTBS0
or
DTTBS1
havethesamefollowingmeaning(seetablebelow).
DTTBSx in Synchronous Mode
Pos. Value
BUFF_LENG 3 .. 0
Field
Definition
0
1
2
..
8
Other
0
Buffer empty.
1 Byte to transmit
(
DTTBFx[0]
).
2 Bytes to transmit
(
DTTBFx[0]
and
DTTBFx[1]
).
..
8 Bytes to transmit
(
DTTBFx[0 .. 7]
).
Not allowed.
Reserved, must be 0.
Other
7 .. 4
This status byte must be written by the Host, after
filing the correspondingdata buffer
DTTBFx[0..7]
with the right number of data bytes to transmit.
This status byte is cleared by the ST75C530/540,
just beforegeneratingthe
IT2
interrupt.
ST75C530 - ST75C540
66/84
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