HFC-4S Cologne Chip AG, HFC-4S Datasheet - Page 98

• 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
Connection summary
Table 3.2 shows the flow controller connections as a whole. Bidirectional connections
out with a gray box because they are typically used to establish the data transmissions. These rows
have always an additional connection to a second destination.
The most important connections are data transmissions to a single destination. For these connections
it is possible to manage the configuration programming of V_DATA_FLOW with only four different
values for transmit and receive FIFO operations. Table 3.3 shows the suitable programming values
which can be used to simplify the programming algorithm.
receive data which belong together. Instead of “transmit and corresponding receive data connection” the shorter expression
98 of 273
3
In fact, all connections are unidirectional. However, in typical applications there is always a pair of transmit and
V_DATA_FLOW
channel data from
HDLC controller
HDLC controller
channel data to
000
001
010
011
100
101
110
111
transparent
HDLC or
data
Figure 3.4: The flow controller in receive FIFO operation
FIFO
FIFO
FIFO
FIFO
FIFO
FIFO
S/T
S/T
no data
transfer
Flow Controller
in receive operation
receive FIFO
selection
V_DATA_FLOW [0]
Table 3.2: Flow controller connectivity
0
1
PCM
PCM
S/T
PCM
S/T
S/T
PCM
S/T
Transmit
Data Sheet
FIFO
S/T
S/T
Data flow
FIFO
transmit S/T
selection
PCM
PCM
PCM
PCM
0
1
V_DATA_FLOW [1]
switching buffer
switching buffer
switching buffer
FIFO
FIFO
FIFO
FIFO
FIFO
FIFO
FIFO
FIFO
no data
transfer
Receive FIFO
S/T
PCM
S/T
PCM
S/T
PCM
PCM
S/T
March 2003 (rev. A)
transmit PCM slot
channel data from
transmit S/T-channel
receive S/T-channel
receive PCM slot
channel data to
channel data from
channel data to
S/T
S/T
S/T
S/T
3
Cologne
Chip
are pointed
PCM
PCM
PCM
PCM