HD64570F Renesas Electronics America, HD64570F Datasheet - Page 214
HD64570F
Manufacturer Part Number
HD64570F
Description
IC SCA SRL COMM ADAPTER 88QFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64570F.pdf
(469 pages)
Specifications of HD64570F
Applications
ISDN
Interface
Serial
Voltage - Supply
4.5 V ~ 5.5 V
Package / Case
88-QFP
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Transmission Operation: Figure 5.27 is the state transition diagram for transmission in bit
synchronous HDLC mode.
Rev. 0, 07/98, page 198 of 453
Note: Zeros are inserted to or deleted from the A , A , C, I, and FCS fields.
Part to be sent to the receive buffer
TX disable state
The transmitter is placed in TX disable state by a hardware reset, a channel reset, or a TX reset
command. In this state, the TXD line is high (mark), and the TXRDY bit of status register 0
(ST0) is cleared.
Idle state
A transmit enable command sets the transmitter in idle state from TX disable state. In idle
state, the transmitter behaves according to the value of the IDLC bit of the control register
(CTL): repeatedly transmits high (mark) signals when IDLC is 0 or transmits the contents of
the idle pattern register (IDL) when IDLC is 1, via the TXD line. When transmit data is
written, the transmitter enters opening flag transmit state.
Opening flag transmit state
The transmitter transmits one flag and enters character transmit state.
Character transmit state
The transmitter sequentially transmits data from the transmit buffer.
FCS transmit state
The transmitter transmits FCS (CRC) data and enters the next state.
Closing flag transmit state
The transmitter transmits one flag and enters the next state. (When frames are sent in
succession, they are automatically delimited by at least one closing flag and one opening flag.)
Abort transmit state
The transmitter transmits abort pattern 11111111 and enters the next state.
8 bits
Flag
Figure 5.26 Message Format for Bit Synchronous Mode
8 bits
A
1
0 or 8 bits
A
2
8 bits x N (N 1)
(CRCCC = 1)
C, I
1
(CRCCC = 0)
2
16 bits
FCS
8 bits
Flag
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