PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 215

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Note:
4.1.18
In all modes except transparent modes 2 and 3, this register contains the control field of a
received HDLC frame. In transparent modes 2 and 3, the register is not used.
Mode
Auto-mode,
1-byte address
(U/I frames)
Auto-mode,
2-byte address
(U/I frames)
Auto-mode,
1-byte address
(I frames)
Auto-mode,
2-byte address
(I frames)
Non-auto-mode,
1-byte address
Non-auto-mode,
2-byte address
Transparent mode 1 3
Transparent mode 2 –
Transparent mode 3 –
Semiconductor Group
If the value FF
SAPI1-TEI1 (SAPI1-TEIG) are not handled autonomously by the ISAC-S.
In auto and non-auto-modes with one-byte address field, TEI1 is a command
address, according to X.25 LAPB.
7
Receive HDLC Control Register
(Note 1)
(Note 1)
Contents of RHCR
Modulo 8
(MCS = 0)
Control field
Control field
2
3
nd
rd
rd
H
byte after flag
byte after flag
byte after flag
is programmed in TEI1, received numbered frames with address
Modulo 128
(MCS = 1)
U-frames only:
Control field
U-frames only:
Control field
Control field in
compressed form
Control field in
compressed form
215
RHCR
(Note 2)
(Note 2)
(Note 3)
(Note 3)
Read
Contents of RFIFO
From 3
From 4
From 4
From 5
From 3
From 4
From 4
From 1
From 2
Register Description
rd
th
th
th
rd
th
th
st
nd
byte after flag
byte after flag
byte after flag
byte after flag
byte after flag
byte after flag
byte after flag
byte after flag
byte after flag
Address 29
0
(Note 4)
(Note 4)
(Note 4)
(Note 4)
H