HFC-S2M Cologne Chip AG, HFC-S2M Datasheet - Page 137
![no-image](/images/no-image-200.jpg)
HFC-S2M
Manufacturer Part Number
HFC-S2M
Description
Isdn HDLC Fifo Controller With Primary Rate Interface
Manufacturer
Cologne Chip AG
Datasheet
1.HFC-S2M.pdf
(272 pages)
- Current page: 137 of 272
- Download datasheet (3Mb)
4.3.6 Reading - and -counters
For all asynchronous host accesses to the HFC-E1 there is a small chance that a register is
changed just in the moment when it is read. Because of slightly different delays of individual
bits, it is even possible that the read value is fully invalid. Therefore we advise to read a -
or -counter register until two consecutive readings find the same value.
This is not necessary for a time period of at least 125 s after writing R_FIFO. It is also
not necessary for -counters of receive FIFOs if
received and the counters
March 2003 (rev. A)
HFC-E1
G
For normal data transmission the register A_SUBCH_CFG must be set
to 0x00. To use 56 kbit/s restricted mode for U.S. ISDN lines the register
A_SUBCH_CFG must be set to 0x07 for B-channels.
Important !
FIFO handling and HDLC controller
½´ ¾µ
and
Data Sheet
¾´ ¾µ
are stable and valid.
½
¾
. Then a whole frame has been
Cologne
Chip
137 of 272
Related parts for HFC-S2M
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![HFC-S](/images/no-image3.png)
Part Number:
Description:
Isdn S/t HDLC Basic Rate Controller
Manufacturer:
Cologne Chip AG
Datasheet:
![HFC-S+](/images/no-image3.png)
Part Number:
Description:
Isdn S/t HDLC Basic Rate Controller
Manufacturer:
Cologne Chip AG
Datasheet:
![HFC-4S](/images/no-image3.png)
Part Number:
Description:
Isdn HDLC Fifo Controller With 8 (4) Integrated S/t Interfaces
Manufacturer:
Cologne Chip AG
Datasheet:
![HFC-SP](/images/no-image3.png)
Part Number:
Description:
Isdn S/t HDLC Basic Rate Controller
Manufacturer:
Cologne Chip AG
Datasheet:
![HFC-SPCI](/images/no-image3.png)
Part Number:
Description:
Isdn S/t HDLC Basic Rate Controller
Manufacturer:
Cologne Chip AG
Datasheet:
![HFC-SUSB](/images/no-image3.png)
Part Number:
Description:
Isdn S/t HDLC Basic Rate Controller
Manufacturer:
Cologne Chip AG
Datasheet:
![HFC-Smini](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
Cologne Chip AG
Datasheet:
![HFC-U](/images/no-image3.png)
Part Number:
Description:
Isdn HDLC Basic Rate Controller
Manufacturer:
Cologne Chip AG
Datasheet: