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| 型號(hào)： | ST75C540FP-A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES |
| 中文描述： | 超級(jí)綜合DEVICESWITH數(shù)字信號(hào)處理器，模擬前端 |
| 文件頁(yè)數(shù)： | 65/84頁(yè) |
| 文件大?。?/td> | 599K |
| 代理商： | ST75C540FP-A |
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XI- TRANSMITTING DATA IN PARALLEL MODE
(continued)
XI.1.5- FSK Full DuplexMode
In FSK Full duplex Mode the parallel mode as-
sumesthat the Bit time durationis the nominal Bit
rate.
Eachbit elementfrom the Transmit buffer is main-
tainedduring the full bit time.
The Nominal bit clockis definedas follows :
FSK Standard
V.21
Bell 103
V.23 Originate
V.23 Answer
Nominal Transmit Bit Rate (Hz) (1)
300
300
75
1200
Note 1 :
The accuracy of the Bit clock is given by the
ST75C530/540 oscillator, and must better than 100ppm.
XI.2- Modem FlowChart
When Data Mode, each time the ST75C530/540
need a bit to transmit it executes the following
routine (see Figure 28). Where x starts with the
value 0 and togglethereafterbetween1 and 0.
XI.3- Host Flow Chart
Here after are Flowcharts to :
- Establisha V.29transmission
- Send Synchronous continuous “$AA, $55, $AA,
$55,...”sequence.ThemanagmentoftheBuffers
are done under Interrupt.
- Stop properly the transmition.
No
Yes
BEGIN
READ BIT IN
INTERNALBUFFER
INTERNALBUFFER
EMPTY
SELECTNEXT DUAL
RAM BUFFERX
No
Yes
DTTBSx= 0
MOVEDTTBFx DATA
TO INTERNALBUFFER
CLEARDTTBSx
RAISE IT2 INTERRUPT
RETURN
RETURN
SIGNALERROR
INTO ERR_TX
RAISEIT0 INTERRUPT
SELECTDUAL
RAM BUFFER x = 0
RETURN
7
Figure 28
Establisha V.29transmition and sendtheveryfirst
Buffer(see Figure 29).
CONF 0F 08 00 01
HSHK
No
Yes
STA_106 = 1
FORM 00 (opt)
XMIT 1
FILL FIRST BUFFER
Select V.29 9600bps
Start V.29 sequence
Wait until end
of training
Format synchronous
Fill the first buffer # 0
Start to transmit
the first buffer
FILL FIRSTBUFFER
WRITE AA, 55 ...
INTO DTTBF [0..7]
WRITE 08 INTO DTTBFS0
SELECTNEXT BUFFER
IBUF = 1
Tx_COMPLETED = FALSE
ENABLE IT2
ITMASK = 0 x 84
RET
Subroutine :
7
Figure 29
ST75C530- ST75C540
65/84
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