CD2231 Intel Corporation, CD2231 Datasheet - Page 100

no-image

CD2231

Manufacturer Part Number
CD2231
Description
CD2231 Intelligent Two-channel Lan And Wan Communications Controller
Manufacturer
Intel Corporation
Datasheet
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
8.2.7
100
Register Name: COR6
Register Description: Channel Option Register 6
Default Value: x’00
Access: Byte Read/Write
IgnCR
Bit 7
Note: Do not use the STCR (Special Transmit Command register) to send XON and XOFF characters
while using automatic in-band flow control.
Bits 3:0
Channel Option Register 6 (COR6) — Async Mode Only
CR is defined as 0D hex, NL as 0A hex, and NULL as 00 hex.
Bits 7:5
Bits 4:3
ICRNL
Bit 6
Receive flow control FIFO threshold
These four bits define the threshold for automatic flow control activation based on
the contents of the receive FIFO. A threshold value of zero disables this function and
the setting of bit 4 is ignored. Bit 4 determines whether the out-of-band (DTR pin)
or the in-band (XOFF/XON characters) is used to stop the flow of incoming data
from the remote transmitter.
When the number of characters in the FIFO exceeds this threshold, the DTR pin
deasserts or an XOFF character is transmitted. When the number of characters in the
FIFO is less than or equal to the threshold, the DTR asserts or and XON is transmit-
ted.
These three bits are used to enable translation of received CR/NL characters as fol-
lows:
Break Action – These bits determine the action taken after a break condition is
received.
INLCF
Bit 5
IgnBrk
IgnCr
0
0
0
0
1
1
1
1
0
0
1
1
IgnBrk
NBrkInt
ICrRNL
Bit 4
0
1
0
1
0
0
1
1
0
0
1
1
Generate an exception interrupt
Translate to a NULL character
Reserved
Discard character
NBrkInt
INLCR
Bit 3
0
1
0
1
0
1
0
1
No special action on CR and NL
NL translated to CR
CR translated to NL
CR translated to NL and NL translated to CR
CR discarded
CR discarded and NL translated to CR
CR discarded
CR discarded and NL translated to CR
ParMrk
Bit 2
Motorola Hex Address: x’18
INPCK
Bit 1
Intel Hex Address: x’1B
Datasheet
ParInt
Bit 0

Related parts for CD2231