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ST75C540 Datasheet(PDF) 68 Page - STMicroelectronics

Part # ST75C540
Description  SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES
PDF  84 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST75C540 Datasheet(HTML) 68 Page - STMicroelectronics

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XI.6.4 - Long Frame
XI - TRANSMITTING DATA IN PARALLEL MODE (continued)
TRANSMITTED
DATA
BUFF_FRAB
BUFF_SFRM
BUFF_EFRM
BUFF_LENG
(BUFF_DATA)
$7E
08
5
CRC
$7E
D0
D1
D2
D3
0
8
4
D0
D1
D2
D3
Figure 33
XI.6.5 - Abort Frame
TRANSMITTED
DATA
BUFF_FRAB
BUFF_SFRM
BUFF_EFRM
BUFF_LENG
(BUFF_DATA)
$7E
D0
D1
D2
D3
0
$7E
D5
0
ABORT
D4
D0
D1
D2
D3
D5
D4
x
5
88
x
68
8
Figure 34
XI.6.6 - Abort Due to Underflow
TRANSMITTED
DATA
BUFF_FRAB
BUFF_SFRM
BUFF_EFRM
BUFF_LENG
(BUFF_DATA)
$7E
D0
D1
D2
D3
0
ABORT
$7E
D4
D5
D0
D1
D2
D3
D4
D5
ERR_TX
(1)
(2)
(3)
58
8
0
6
8
8
Figure 35
Where : 1. The Underflow condition appears when the ST75C530/540 needs, inside a frame, some bytes to transmit and that the
corresponding buffer is empty.
2. The
ERR_TX bit is cleared with a CSE 01 Command.
3. After an Underflow condition restart the initialization of the parallel mode and use the buffer number 0.
ST75C530 - ST75C540
68/84



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