PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 188

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

Figure 80
Receive Data Flow
Note 1 Only if a 2-byte address field is defined (MDS0 = 1 in MODE register).
Note 2 Comparison with Group TEI (FF
Note 3 In the case of an extended, modulo 128 control field format (MCS = 1 in SAP2
Note 4 In the case of an extended control field, only the first byte is stored in RHCR, the
A frame longer than 32 bytes is transferred to the microcontroller in blocks of 32 bytes plus one
remainder block of length 1 to 32 bytes. The reception of a 32-byte block is reported by a
Receive Pool Full (RPF) interrupt and the data in RFIFO remains valid until this interrupt is
acknowledged (RMC). This process is repeated until the reception of the remainder block is
completed, as reported by RME (figure 79). When the total frame length exceeds 4095 bytes,
bit OV (RBCH) is set but the counter is not blocked. If the second RFIFO pool has been filled
or an end-of-frame is received while a previous RPF or RME interrupt is not yet acknowledged
Semiconductor Group
Auto Mode
(U and Frames)
Non-Auto
Mode
Transparent
Mode
Transparent
Mode
Transparent
Mode
-
-
1
2
3
(MDS0 = 1 in MODE register).
register) the control field is stored in RHCR in compressed form (I frames).
second in RFIFO.
-
Description of Symbols:
Flag
SAP1, SAP2
SAP1, SAP2
SAP1, SAP2
Address
FE, FC
(Note 1)
FE, FC
(Note
FE, FC
SAPR
High
Checked automatically by
Compared with Register or Fixed Value
Stored Info Register or RFIFO
1)
TEI1, TEI2
TEI1, TEI2
TEI1, TEI2
Address
(Note
(Note 2)
Low
FF
FF
FF
H
) is only made if a 2-byte address field is defined
2)
188
ISAC -S
Control
(Note
(Note 3)
(Note 4)
RFIFO
RFIFO
RHCR
RHCR
RHCR
R
4)
Information
Operational Description
RFIFO
RFIFO
RFIFO
RSTA
RSTA
RSTA
RSTA
RSTA
CRC
ITD02342
Flag