PEB20534H-10 SIEMENS [Siemens Semiconductor Group], PEB20534H-10 Datasheet - Page 301

• Manufacturer Part Number: PEB20534H-10
• Description: DMA Supported Serial Communication Controller with 4 Channels DSCC4
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
RFTH(2..0)
Receive FIFO Threshold
This bit field defines the level up to which the SCC receive FIFO is filled
with valid data before transfer to the central RFIFO is requested.
(Transfer always starts immediately in case of a ’frame end / block end’
condition.)
The meaning depends on the selected protocol engine:
HDLC Modes:
RFTH(2..0)
’000’
’001’
’010’
’011’
’100’
’101’
’110’
’111’
ASYNC/BISYNC Modes:
RFTH(2..0)
’000’
’001’
’010’
’011’
’100’
’101’
’110’
’111’
Threshold level in number of data (d) and status (s) bytes
Threshold level in number of data (d) and status (s) bytes
depending on bit ’RFDF’:
RFDF = ’0’
1d
4d
16d
24d
32d
60d
1d
1d
depending on bit ’RFDF’:
RFDF = ’0’
1d
4d
16d
24d
32d
60d
1d
1d
301
Detailed Register Description
RFDF = ’1’
2d
2d
2d
RFDF = ’1’
1d+1s
2d+2s
8d+8s
12d+12s
16d+16s
30d+30s
1d+1s
1d+1s
don’t care
don’t care
don’t care
don’t care
don’t care
Data Sheet 09.98
PEB 20534
(all modes)