HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 33

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

Notes:
Byte synchronous
Bisync
DDCMP
Bit synchronous
LAPB
LAPD
Frame relay
01111110
01111110
01111110
(8 bits)
(8 bits)
(8 bits)
Flag
Flag
Flag
1.
2.
Mark
EA
EA
(14 bits)
0
0
Header
Address
Count
(8 bits)
CR
CR
field
8 bits
8 bits
(upper)
(6 bits)
SAPI
DLCI
CRC-16 polynomial: X
CRC-CCITT polynomial: X
(2 bits)
Flag
Start bit
Control
(8 bits)
EA
EA
field
1
1
Figure 1.7 Examples of Transmission Formats
DE BECN FECN
8 bits
(7 bits)
TEI
ledge (8 bits)
Acknow-
(arbitrary number of 8 bit characters)
Header
8 bits
5 to 8 data bits
field (8 or
Sequence
Control
16 bits)
(8 bits)
(lower)
16
DLCI
+ X
(multiple of 8 bits)
Information field
Information
16
Address
(16 bits)
SOH:
STX:
SYN:
15
+ X
+ X
12
2
Start of header
Start of text
Synchronous hold
+ X
+ 1
CRC-16
(16 bits)
Parity
(even
or odd)
(multiple of 8 bits)
(multiple of 8 bits)
Information field
Information field
5
+ 1
SAPI:
TEI:
EA:
CR:
DLCI:
DE:
BECN:
FECN:
*1
Stop bit(s)
(1, 1.5, or 2 bits)
of 8-bit characters)
(arbitrary number
Service access point identifier
Terminal endpoint indicater
Address field extention
Command/response field
Data link connection identifier
Discard eligibility indicator
Backward (network to transmit
station) explicit congestion
notification
Forward (network to receive
station) explicit congestion
notification
Information
Rev. 0, 07/98, page 17 of 453
ETB:
ETX:
sequence (16 bits)
sequence (16 bits)
sequence (16 bits)
(CRC-CCITT
(CRC-CCITT
(CRC-CCITT
Frame check
Frame check
Frame check
Asynchronous
preset 1)
preset 1)
preset 1)
End of text block
End of text
Block check
(CRC-16)
*2
*2
*2
CRC-16
(16 bits)
01111110
01111110
01111110
(8 bits)
(8 bits)
(8 bits)
Flag
Flag
Flag
*1
*1