HFC-4S Cologne Chip AG, HFC-4S Datasheet - Page 110

• Manufacturer Part Number: HFC-4S
• Description: Isdn HDLC Fifo Controller With 8 (4) Integrated S/t Interfaces
• Manufacturer: Cologne Chip AG

HFC-4S
HFC-8S
FSM programming
The list index register R_FSM_IDX specifies the list index with bitmap V_IDX in the range of
¼
programming. So all array registers indexed with [FIFO] are indexed with the V_IDX value instead.
The first FIFO of the list has to be specified in the register R_FIRST_FIFO with the direction bit
V_FIRST_FIFO_DIR and the FIFO number V_FIRST_FIFO_NUM. The next FIFO has to be
specified in the register A_FIFO_SEQ. Referring to Figure 3.9 the array registers of the list entry
A FIFO handles more than one HFC-channel if this FIFO is entered several times in the ‘next FIFO’
entries.
The connected HFC-channel and the FIFO configuration must be programmed in the same way as
in CSM. These settings belong to the FIFO which is specified in the previous list entry under ‘next
FIFO’ (or the R_FIRST_FIFO register for the first list entry).
The FIFO sequence list terminates with V_SEQ_END
list entries must set V_SEQ_END
Example for FSM
Figure 3.10 shows an example with three bidirectional connections. The black lines illustrate data
paths, whereas the dotted lines symbolize blocked HFC-channels. These are not used for data trans-
mission, but they are necessary to enable the settings.
All FIFOs can be arranged in arbitrary order. In the example the list specification of Table 3.5 is
110 of 273
· ½
are assigned to FIFO
¿
. R_FSM_IDX has the same address as R_FIFO because in FSM it replaces R_FIFO for list
FIFOs
#14
#14
#12
#12
#13
#13
RX
RX
TX
RX
TX
TX
Õ
because ‘next FIFO’ entry at list index is ‘FIFO q’.
Figure 3.10: FSM example
¼
to continue the sequence processing with the next entry.
1
3
2
Data Sheet
HFC-channel
Data flow
#12
#12
#17
#17
#20
#20
#15 TX
#15 RX
½
RX
RX
RX
TX
TX
TX
in the register A_FIFO_SEQ. The other
March 2003 (rev. A)
S/T interf.
PCM slot
#21
#21
#3
#3
#4
#4
#5
#5
#3
#3
B1
B1
B2
B2
B1
B1
RX
E RX
TX
Cologne
Chip
RX
RX
RX
TX
TX
TX