參數(shù)資料
型號(hào)： CD1865
廠商： Intel Corp.
英文描述： Intelligent Eight-Channel Communications Controller
中文描述： 智能八通道通信控制器
文件頁數(shù)： 65/150頁
文件大小： 871K
代理商： CD1865
Intelligent Eight-Channel Communications Controller
—
CD1865
Datasheet
65
Bits affecting flow control are summarized below.
The FCT bit controls whether flow-control characters are passed on to the host. It has meaning only
when In-Band flow control is enabled, that is, TxIBE is set. When the CD1865 receives a flow-
control character or character sequence and FCT is a
‘
0
’
, it starts or stops the transmitter, as
required, and passes the character onto the host as a Receive Exception. Since there is a one-to-one
correspondence between the Status and Receive FIFO, the flow-control character detected is stored
in the Receive FIFO, and a status byte indicating special-character detect is stored in the Status
FIFO. If FCT is a
‘
0
’
, RxSC must be set to enable service requests to be issued to the host.
Otherwise, flow-control characters cannot be passed as Receive Exceptions and is instead passed
as Good Data.
If the FCT bit is a
‘
1
’
, the CD1865 still starts or stops the transmitter, as required, but the
character(s) are discarded, and no exception is posted. In either case, the flow-control status of the
transmitter (on or off) is maintained by the CD1865 in the Channel Control Status register (CCSR).
The FCT bit makes it possible to support
‘
escaping
’
of flow-control characters. Some systems
follow a convention where two identical flow-control characters in a row indicates that flow
control is not to be performed, but rather one flow-control character is to be kept in the normal
received-data stream, and the other
‘
escape
’
character is to be discarded. If the CD1865 is in such a
system, set the FCT bit to a
‘
0
’
, allowing flow-control characters to pass onto the host. When the
host detects two flow-control characters in a row, it simply restores the proper flow-control state of
the channel and discards one of the characters. However, for most systems the FCT bit can be set to
a
‘
1
’
, reducing loading on the host.
7.1.9.1
No New Data Received Time-Out
It is sometimes useful for the host to sense that
‘
no data has arrived lately
’
, when managing
relatively large I/O buffers. This event is used to flush the buffer up to the host for processing. One
of the receive timer options, No New Data Time-out (NNDT), generates a service request for the
first Receive Data Time-out following the transfer of all data from the channel to the host. This
service request is a Receive Exception sub-type, and can be enabled or disabled by controlling the
NNDT bit in the . Refer to
Figure 23 on page 67
for the timer logic.
The timer is started only on data arrival. If the CD1865 processor determines that the Receive FIFO
is empty, the timer has expired, and there is a previous receipt of Good Data (and the timer feature
is enabled), a Receive Exception occurs with a status indicating that a time-out has occurred.
If the last Receive Exception Service Request was triggered by a time-out (to avoid
‘
stale
’
data) the
No New Data Time-out Service Request occurs immediately after the Data Transfer Service
Request completes. If the last service request was triggered by reaching the threshold, the timer
Bit Name
Register
Function
SCDE
COR3
Enables Special Character Recognition.
TxIBE
COR2
Enables Automatic Transmitter Flow-Control.
FCT
COR3
Sets Transparency mode of flow-control.
XonCH
0
0
1
1
XoffCH
0
1
0
1
Xon
SCHR1
SCHR1
Xoff
SCHR2
(SCHR2 and SCHR4)
SCHR2
(SCHR3 and SCHR4)
(SCHR1 and SCHR3)
(SCHR1 and SCHR3)
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